EATON VANCE MUNICIPAL BOND FUND L P
N-30D, 1997-08-21
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<PAGE>
 
 
[EATON VANCE LOGO APPEARS HERE]


                                                  [PHOTO OF WALL WITH THE WORD
                                                 "EDUCATION" ON IT APPEARS HERE]





                                  EATON VANCE

                                MUNICIPAL BOND

                                  FUND, L.P.


[PHOTO OF HIGHWAY APPEARS HERE]


                                  Eaton Vance
                     Global Management-Global Distribution




[PHOTO OF BRIDGE APPEARS HERE]


<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

INVESTMENT UPDATE


[PHOTO OF THOMAS FETTER, PORTFOLIO 
    MANAGER APPEARS HERE]

Thomas Fetter,
Portfolio Manager


Investment Environment
- --------------------------------------------------------------------------------
The Economy

 . The U.S. economy posted solid growth in the first half of the year. Gross
  domestic product advanced a robust 4.9% in the first quarter, while
  unemployment fell to a 24-year low of 4.8%. Despite the strong economic
  climate, inflation remained in the 2-to-3% range.

 . While inflation seemed generally in check, the Federal Reserve maintained a
  vigilant policy. In March, the Fed raised its Federal funds target rate -
  a key short-term rate barometer - to 5.5%.

 . The municipal market modestly outperformed the Treasury market in the first
  half of 1997. While Treasuries struggled to compete with stocks, lower supply
  gave a boost to municipals. 

The Fund
- --------------------------------------------------------------------------------
Management Discussion

 .  Our largest sector weighting was in escrowed bonds. Escrowed bonds have been
   pre-refunded by their issuers to take advantage of lower interest rates.
   Because they are backed by Treasury bond payments, they are of the very
   highest quality.

 .  With yield spreads still narrow, we sought value in non-rated bonds. Assisted
   living and life care facilities, in particular, offered attractive investment
   opportunities.

 .  Finally, we've reduced the Portfolio's holdings in bonds with relatively low
   yields in favor of higher-yielding issues. That has significantly improved
   the "book yield" of the Portfolio and will enable the Fund to maintain its
   attractive dividend stream.

- --------------------------------------------------------------------------------
Mutual fund shares are not insured by the FDIC and are not deposits or other
obligations of, or guaranteed by, any depository institution. Shares are subject
to investment risks, including possible loss of principal invested.
- --------------------------------------------------------------------------------

Performance for the Past Six Months

 .  The Fund's total return was 4.9% for the six months ended June 30, 1997,/1/
   the result of a rise in net asset value per share from $10.07 on December 31,
   1996 to $10.25 on June 30, 1997, and the reinvestment of $0.30 in dividends.
   The Fund was ranked #1 of 226 General Municipal Debt funds for the year ended
   June 30, according to Lipper Analytical Services, a mutual fund ranking
   service./2/

 .  Based on the most recent dividend and the net asset value of $10.25 per share
   on June 30, the Fund had a distribution rate of 5.85%. To equal that, an
   investor paying a 36% tax rate would need to receive 9.14% in a taxable
   investment.

 .  The Fund's risk-adjusted performance earned it a Four-Star overall Rating
   among municipal bond funds covered by Morningstar, Inc. - a nationally
   recognized monitor of fund performance - for the period ended June 30./3/


Your Investment at Work                            
- --------------------------------------------------------------------------------
                                                   [MEDICAL SYMBOL APPEARS HERE]


   New Jersey Economic Development 
   Authority - Keswick Pines Project

 .  These non-rated bonds provided funding for the construction of a continuing
   care retirement community in Whiting, New Jersey.

 .  Keswick Pines provides a wide range of living options to meet the physical,
   social and spiritual needs of its residents.

 .  With an attractive 8.75% coupon, these bonds provide excellent income for the
   Portfolio.

- --------------------------------------------------------------------------------
/1/This return does not include the Fund's 3.75% maximum sales charge.

/2/Source: Lipper Analytical Services. Lipper rankings are based on total return
   and do not take sales charges into consideration. It is not possible to
   invest directly in the Lipper average of General Municipal Debt funds.

/3/Morningstar ratings reflect historical risk-adjusted performance though
   6/30/97 and are subject to change. Past performance is no guarantee of future
   results. Funds are assigned ratings from 1 star (lowest) to 5 stars
   (highest). Ratings are calculated from the funds' 3-,5-, and 10-year returns
   (with fee adjustment) in excess of 90-day Treasury bill returns. The top 10%
   of the funds in a category receive 5 stars, the next 22.5%, 4 stars, and the
   following 35%, 3 stars. For the 3-year period, the Fund was rated 5 stars
   (1315 funds); for the 5-year period, 4 stars (640 funds); and for the 10-year
   period, 4 stars (297 funds).

/4/Returns are calculated by determining the percentage change in net asset
   value with all distributions reinvested. SEC average annual returns reflect
   maximum 3.75% sales charge.
 
/5/Because the Fund is actively managed, sector weightings and Portfolio
   overview are subject to change. Past performance is no guarantee of future
   results. The value of an investment in the Fund will fluctuate so that
   shares, when redeemed, may be worth more or less than their original cost.

- --------------------------------------------------------------------------------

Fund Information
as of June 30, 1997

Performance/4/
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
Average Annual Total Returns (at net asset value)
- --------------------------------------------------------------------------------
<S>                                                                        <C>
One Year                                                                   11.2%
Five Years                                                                  7.2
Ten years                                                                   8.6

<CAPTION> 

SEC Average Annual Total Returns (including maximum sales charge)
- --------------------------------------------------------------------------------
<S>                                                                        <C> 
One Year                                                                    7.1%
Five Years                                                                  6.4
Ten years                                                                   8.2
</TABLE>

5 Largest Sectors/5/
- --------------------------------------------------------------------------------
By total investments
<TABLE> 
<S>                                                                        <C> 
Escrowed/Prerefunded                                                       15.4%
Transportation                                                             13.7%
Nursing Homes                                                               8.5%
Industrial Development Bonds                                                8.4%
Lease Revenue                                                               7.7%
</TABLE> 

Portfolio Overview/5/
- --------------------------------------------------------------------------------
<TABLE> 
<S>                                                                    <C> 
Number of Issues                                                              63
Average Maturity                                                       23.6 Yrs.
Effective Maturity                                                     13.4 Yrs.
Average Rating                                                                 A
Average Call                                                            9.3 Yrs.
Average Dollar Price                                                      $93.96
</TABLE> 

                                       2
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

PORTFOLIO OF INVESTMENTS (Unaudited)

<TABLE>
<CAPTION>

Tax-Exempt Investments -- 100.0%


                   
Ratings (Unaudited)  Principal                                           
- -------------------  Amount                                              
        Standard     (000                                                
Moody's & Poor's     omitted)  Security                  Value           
- -------------------------------------------------------------------------
<S>     <C>          <C>        <C>                      <C>              
Assisted Living -- 3.7%
- -------------------------------------------------------------------------
 NR       NR         $1,000    Bell County, TX, Health                   
                               Facilities, (Care                         
                               Institute, Inc.),         $1,097,720      
                               9.00%, 11/1/24                            
 NR       NR          1,000    St. Paul, MN, Housing                     
                               and Redevelopment (Care                   
                               Institute, Inc.),          1,095,140       
                               Highland Park, 8.75%,                     
                               11/1/24                                   
 NR       NR          1,000    Village of North                          
                               Syracuse, NY, Housing                     
                               Authority (AJM Senior                     
                               Housing, Inc., Janus       1,012,430       
                               Park), 8.00%, 6/1/24                      
- -------------------------------------------------------------------------
                                                                         
                                                         $3,205,290      
- ------------------------------------------------------------------------- 

Electric Utilities -- 3.1%
- -------------------------------------------------------------------------
 Aa       AA         $1,000    Colorado Springs                          
                               Utility System, 6.75%,    $1,094,600      
                               11/15/21                                  
 Baa2     BBB+        1,500    Massachusetts Municipal                   
                               Wholesale Electric Co.,    1,608,330       
                               6.75%, 7/1/11                             
- -------------------------------------------------------------------------
                                                         $2,702,930      
- ------------------------------------------------------------------------- 

Escrowed / Prerefunded -- 15.4%
- -------------------------------------------------------------------------
 Aaa      NR         $2,500    Boston City Hospital,                     
                               FHA Insured, 7.625%,      $2,783,850      
                               2/15/21                                   
 NR       AAA         8,000    Colorado Health                           
                               Facilities Authority,                     
                               (Liberty Heights), FSA     1,583,760       
                               Insured, 0%, 7/15/24                      
 Aaa      NR         19,000    Dawson Ridge                              
                               Metropolitan District                     
                               Number 1, Douglas          4,238,520       
                               County, CO, 0%, 10/1/22                   
 Aaa      NR            685    Massachusetts IFA,                        
                               (Cape Cod Hospital),         772,769       
                               8.40%, 11/15/08                           
 Aaa      NR          5,000    Mississippi Housing                       
                               Finance Corp., Single      1,820,000       
                               Family (AMT), 0%, 6/1/15                  
 Aaa      BBB           665    North Carolina Eastern                    
                               Municipal Power, 6.50%,      758,167       
                               1/1/18                                    
 Aaa      NR          6,000    Savannah, GA, Economic                    
                               Development Authority,                    
                               0%, 12/1/21                1,399,740       
- -------------------------------------------------------------------------
                                                        $13,356,806     
- -------------------------------------------------------------------------
                                                                         
                                                                         
- ------------------------------------------------------------------------- 

Hospitals -- 7.7%
- ------------------------------------------------------------------------- 
 Aa3      AA-        $1,500    Greenville, SC,                           
                               Hospital System, 5.25%,   $1,431,585      
                               5/1/23                                    
 A2       A             500    Illinois Health and                       
                               Education Facilities,                     
                               (Victory Memorial),          542,595       
                               7.875%, 12/1/18                           
 NR       BBB         2,000    Louisiana PFA, General                    
                               Health Systems Project,    2,109,620       
                               6.80%, 11/1/16                            
 Aaa      AAA           225    New York State Medical                    
                               Care, 7.875%, 8/15/20        252,457       
 Baa1     BBB+          600    New York State,                           
                               Medical Care Facility                     
                               Finance Agency Mental                     
                               Health Services,             665,748       
                               7.875%, 8/15/20(1)                        
 Baa      BBB         1,550    New York State, Medical                   
                               Care Facility,                            
                               (Brookdale Medical         1,666,250       
                               Center), 6.85%,                           
                               2/15/17(1)                                
- -------------------------------------------------------------------------
                                                         $6,668,255      
- -------------------------------------------------------------------------
                                                                         
Housing -- 6.5%                                                          
- -------------------------------------------------------------------------
 NR       AA         $  485    Arkansas Development                      
                               Finance Authority,                        
                               SFMR, 8.00%, 8/15/11(1)    $ 521,341       
 Aa2      NR            750    Colorado Housing and                      
                               Finance Authority,                        
                               Single Family Access         835,447       
                               Program, 7.90%, 12/1/24                   
 NR       NR          1,000    Florence, KY, Housing                     
                               Facilities, 7.625%,        1,001,000       
                               5/1/27                                    
 NR       NR          1,290    Lake Creek Affordable                     
                               Housing Corp., Eagle                      
                               County, CO, 8.00%,         1,346,153       
                               12/1/23                                   
 Aa2      AA            220    North Carolina Single                     
                               Family Mortgage                           
                               Revenue, 8.125%, 9/1/19      227,273       
 NR       A           1,650    Travis County, TX HFC                     
                               Multifamily (Travis                       
                               Station Apartments),       1,716,033       
                               6.75%, 4/1/19(1)                          
- -------------------------------------------------------------------------
                                                         $5,647,247      
- ------------------------------------------------------------------------- 

Industrial Development Revenue / Pollution Control
Revenue -- 8.4%
- -------------------------------------------------------------------------
 NR       NR         $  850    Florence County, SC,                      
                               (Stone Container                          
                               Company), 7.375%, 2/1/07  $  874,633       
 NR       NR          1,000    Maricopa County, AZ,                      
                               IDA, 8.625%, 1/1/27        1,006,650        
</TABLE>

                       See notes to financial statements

                                       3
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

PORTFOLIO OF INVESTMENTS (Unaudited) CONT'D

<TABLE>
<CAPTION>

Ratings (Unaudited)  Principal                                           
- -------------------  Amount                                              
        Standard     (000                                                
Moody's & Poor's     omitted)  Security                  Value           
- ---------------------------------------------------------------------
<S>     <C>          <C>        <C>                      <C>              
Industrial Development Revenue / Pollution Control
Revenue (continued)
- ---------------------------------------------------------------------
 NR       NR         $1,750    New Jersey Economic                       
                               Development Authority                     
                               (Holt Hauling and         
                               Warehouse), 7.75%,                        
                               3/1/27                    $1,788,990      
 NR       BBB-        2,450    Port Camas-Washougan,                     
                               WA, James River, 6.70%,   
                               4/1/23                     2,527,690       
 NR       NR          1,000    Santa Fe, NM, IDA,                        
                               8.50%, 9/1/16              1,082,220       
- ---------------------------------------------------------------------
                                                         $7,280,183      
- --------------------------------------------------------------------- 

Insured-Education -- 2.1%
- ---------------------------------------------------------------------
 Aaa      AAA        $2,000    University of                             
                               California - Multiple                     
                               Projects (AMBAC),         
                               4.875%, 9/1/19            $1,801,780      
- ---------------------------------------------------------------------
                                                         $1,801,780      
- ---------------------------------------------------------------------

Insured-Electric Utilities -- 1.0%
- ---------------------------------------------------------------------
 Aaa      AAA        $  800    Puerto Rico Electric                      
                               Power Authority (FSA),    
                               Variable, 7/1/03(2)       $  887,000       
- ---------------------------------------------------------------------
                                                         $  887,000       
- ---------------------------------------------------------------------

Insured-Hospitals -- 6.6%
- ---------------------------------------------------------------------
 Aaa      AAA        $1,000    Fredericksburg, VA,                       
                               Industrial Development                    
                               Authority (FGIC)          
                               "INFLOS", Variable,                       
                               8/15/23(2)                $1,197,500      
 Aaa      AAA         1,000    Illinois Health                           
                               Facilities Authority,                     
                               (Rush-Presbyterian -                      
                               St. Lukes Medical         
                               Center) (MBIA),                           
                               "INFLOS", Variable,                       
                               10/1/24(2)                 1,155,000       
 Aaa      AAA         1,000    King County, WA, Public                   
                               Hospital District No. 1                   
                               (AMBAC), 6.00%, 9/1/20     1,006,910       
 Aaa      AAA         1,000    Rhode Island Health and                   
                               Educational Facility,                     
                               (Rhode Island Hospital)                   
                               (FGIC),"INFLOS",           
                               Variable, 8/15/21(3)(2)    1,216,250       
 Aaa      AAA         1,000    Salt Lake City, UT,                       
                               (IHC Hospitals Inc.),                     
                               "INFLOS" (AMBAC),         
                               Variable, 5/15/20(3)(2)    1,166,250       
- ---------------------------------------------------------------------
                                                         $5,741,910      
- ---------------------------------------------------------------------
                                                                         
                                                                         
- ---------------------------------------------------------------------
Insured-Housing -- 2.5%
 Aaa      AAA        $1,000    SCA MFMR Receipts,                        
                               Burnsville, MN (FSA),     
                               7.10%, 1/1/30             $1,084,280      
 Aaa      AAA         1,000    SCA MFMR Receipts,                        
                               Springfield, MO (FSA),     
                               7.10%, 1/1/30              1,084,280       
- ---------------------------------------------------------------------
                                                         $2,168,560      
- ---------------------------------------------------------------------

Insured-Special Tax Revenue -- 1.5%
- ---------------------------------------------------------------------
 Aaa      AAA        $1,500    Culver City, CA,                          
                               Redevelopment Finance                     
                               Authority (AMBAC),        
                               4.60%, 11/1/20            $1,294,470      
- ---------------------------------------------------------------------
                                                         $1,294,470      
- ---------------------------------------------------------------------

Insured-Transportation -- 1.3%
- ---------------------------------------------------------------------
 Aaa      AAA        $1,000    Triborough Bridge and                      
                               Tunnel Authority of New                    
                               York, RITES (AMBAC),      
                               Variable, 1/1/12(2)       $1,120,000       
- ---------------------------------------------------------------------
                                                         $1,120,000       
- ---------------------------------------------------------------------

Lease Revenue/
Certificates of Participation -- 4.6%
- ---------------------------------------------------------------------
 A        A          $3,000    California Public Works                   
                               Board, (California                        
                               State University),        
                               5.50%, 12/1/18            $2,895,600      
 NR       NR          1,000    Hardeman County, TN,                      
                               (Correctional             
                               Facilities Corp.),                        
                               7.75%, 8/1/17              1,072,230       
- ---------------------------------------------------------------------
                                                         $3,967,830      
- ---------------------------------------------------------------------

Life Care -- 4.6%
- ---------------------------------------------------------------------
 NR       NR         $1,060    Loudoun County, VA,                       
                               Industrial Development                    
                               Authority (Falcons        
                               Landing), 8.75%, 11/1/24  $1,129,048      
 NR       NR            655    New Hampshire Higher                      
                               Educational and Health                    
                               Facilities (Riverwoods      
                               at Exeter), 9.00%,                        
                               3/1/23                       715,522       
 NR       NR          1,000    New Jersey Economic                       
                               Development Authority,                    
                               Keswick Pines Project,   
                               8.75%, 1/1/24              1,065,260       
 NR       NR          1,000    Vermont Industrial                        
                               Development Authority                     
                               (Wake Robin Corp.),       
                               8.75%, 4/1/23(3)           1,085,220       
- ---------------------------------------------------------------------
                                                         $3,995,050      
- ---------------------------------------------------------------------
</TABLE>

                       See notes to financial statements

                                       4
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

PORTFOLIO OF INVESTMENTS (Unaudited) CONT'D

<TABLE>
<CAPTION>
Ratings (Unaudited)  Principal                                           
- -------------------  Amount                                              
        Standard     (000                                                
Moody's & Poor's     omitted)  Security                  Value           
- -------------------------------------------------------------------------
<S>     <C>          <C>        <C>                      <C>              

Miscellaneous -- 4.8%
- -------------------------------------------------------------------------
 NR       BB-        $1,000    New Hampshire State                       
                               Business Finance          $ 1,059,400      
                               Authority, 7.75%, 1/1/22                  
 NR       NR          1,500    New Jersey Sports and                     
                               Exposition Authority,                     
                               Monmouth Park Project,      1,664,595       
                               8.00%, 1/1/25                             
 Aaa      AAA         1,500    Tampa, FL, Sports                         
                               Authority, 5.25%,           1,451,130       
                               1/1/17(4)                                 
- -------------------------------------------------------------------------
                                                         $ 4,175,125      
- ------------------------------------------------------------------------- 

Nursing Homes -- 8.5%
- -------------------------------------------------------------------------
 NR       NR         $1,455    Bell County, TX,                          
                               (Riverside Healthcare,                    
                               Inc. - Normandy           $ 1,621,088      
                               Terrace), 9.00%, 4/1/23                   
 NR       NR            475    Covington-Allegheny                       
                               County, VA, IDA,                          
                               (Beverly Enterprises),        518,500       
                               9.375%, 9/1/01                            
 NR       NR            975    Greene County, OH,                        
                               First Mortgage,                           
                               (Fairview Extended          1,099,127       
                               Care), 10.125%, 1/1/11                    
 NR       NR          1,100    Massachusetts IFA                         
                               Health Care Facility ,                    
                               (Institute of               1,128,600       
                               Massachusetts Project),                   
                               8.05%, 11/1/25                            
 NR       NR          1,265    Montgomery County, PA,                    
                               IDA (Advancement of                       
                               Geriatric Health Care       1,346,213       
                               Institute), 8.375%,                       
                               7/1/23                                    
 NR       NR            390    Okaloosa County, FL,                      
                               Beverly Enterprises,          405,386       
                               10.75%, 10/1/03                           
 NR       NR            680    Tarrant County Health                     
                               Facilities, TX, 10.25%,       718,740       
                               9/1/19                                    
 NR       NR            485    Wisconsin Health                          
                               Facility Authority,           486,116       
                               Villa Clement, 8.75%,                     
                               6/1/12                                    
- -------------------------------------------------------------------------
                                                         $ 7,323,770      
- ------------------------------------------------------------------------- 

Special Tax Revenue -- 4.0%
- -------------------------------------------------------------------------
 Baa1     A          $3,525    Puerto Rico Highway and                   
                               Transportation                            
                               Authority, 5.50%, 7/1/36  $ 3,439,343      
- -------------------------------------------------------------------------
                                                         $ 3,439,343      
- ------------------------------------------------------------------------- 

Transportation -- 13.7%
- -------------------------------------------------------------------------
 Aaa      NR         $2,807    Indiana Transportation                    
                               Finance Authority,        $ 3,081,103      
                               6.25%, 11/1/16                            
 A2       NR            758    Indiana Transportation                    
                               Finance Authority,            790,708       
                               6.25%, 11/1/16                            
 A1       A+          5,500    Massachusetts State                       
                               Turnpike Authority,         5,137,385       
                               5.00%, 1/1/20                             
 NR       NR         10,000    San Joaquin Hills, CA,                    
                               Toll Roads, 0%, 1/1/25      1,885,100       
 NR       NR          2,500    San Joaquin Hills, CA,                    
                               Transportation Corridor       934,900       
                               Agency, 0%, 1/1/14                        
- -------------------------------------------------------------------------
                                                         $11,829,196     
- ------------------------------------------------------------------------- 

Total Tax-Exempt Investments -- 100%
    (identified cost $78,224,283)                        $86,604,745      
- ------------------------------------------------------------------------- 
</TABLE> 

At June 30,1997, the concentration of the Fund's investments
in the various states, determined as a percentage of total
investments, is as follows:
<TABLE>
 <S>                                                 <C>
 Massachusetts                                       14%
 Colorado                                            11%
 California                                          10%
 Others, representing less                           65%
    than 10% individually
</TABLE>

The Fund invests primarily in debt securities issued by municipalities. The
ability of the issuers of the debt securities to meet their obligations may be
affected by economic developments in a specific industry or municipality. In
order to reduce the risk associated with such economic developments, at June 30,
1997, 15.0% of the securities in the portfolio of investments are backed by bond
insurance of various financial institutions and financial guaranty insurance
agencies. The aggregate percentage by financial institution range from 2.8% to
7.4% of total investments.

(1) Security has been segregated to cover when-issued securities.
(2) Security has been issued as an inverse floater bond. Interest rate is shown
    as of June 30, 1997.
(3) Security has been segregated to cover margin requirements on open financial
    futures contracts.
(4) When-issued security.

                       See notes to financial statements

                                       5
<PAGE>

Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

FINANCIAL STATEMENTS (Unaudited)

Statement of Assets and Liabilities

As of June 30, 1997

<TABLE> 
<CAPTION> 
Assets
- -------------------------------------------------------------------------
<S>                                                          <C> 
Investments, at value (Note 1A)
    (identified cost, $78,224,283)                           $86,604,745
Cash                                                           2,431,268
Receivable for investments sold                                   20,132
Receivable for shares of partnership interest sold                 8,535
Interest receivable                                            1,543,487
Receivable for variation margin on open financial
futures contracts (Note 1D)                                       53,876
- -------------------------------------------------------------------------
Total assets                                                 $90,662,043
- -------------------------------------------------------------------------

Liabilities
- -------------------------------------------------------------------------
Payable for when-issued security (Note 1I)                   $ 1,468,391
Payable for shares of partnership interest purchased              38,239
Payable to affiliate for Director General Partners'
fees (Note 4)                                                      1,694
Accrued expenses                                                  14,175
- -------------------------------------------------------------------------
Total liabilities                                            $ 1,522,499
- -------------------------------------------------------------------------
Net Assets for 8,696,433 shares of partnership interest
outstanding                                                  $89,139,544
- -------------------------------------------------------------------------

Net Assets Applicable to Shares of Partnership 
Interest Owned by:
- -------------------------------------------------------------------------
Limited Partners (8,555,959 shares)                          $87,699,669
General Partners --
    Director partners (2,642 shares)                              27,080
    Adviser partners (137,832 shares)                          1,412,795
- -------------------------------------------------------------------------
Net Assets (8,696,433 shares)                                $89,139,544
- -------------------------------------------------------------------------

Sources of Net Assets
- -------------------------------------------------------------------------
Proceeds from sales of shares of partnership interest 
    (including shares issued to partners electing to 
    receive payment of distributions in shares), less
    cost of shares of partnership interest redeemed          $72,706,301
Accumulated net realized gain on investments (computed
    on the basis of identified cost)                           8,217,583
Net unrealized appreciation of investments (computed on
    the basis of identified cost)                              8,325,462
Accumulated distributions in excess of net 
    investment income                                           (109,802)
- -------------------------------------------------------------------------
Total                                                        $89,139,544
- -------------------------------------------------------------------------

Net Asset Value and Redemption
Price Per Share of Partnership Interest
- -------------------------------------------------------------------------
($89,139,544/8,696,433 shares of                             $     10.25
    partnership interest outstanding)
- -------------------------------------------------------------------------

Computation of Offering Price
- -------------------------------------------------------------------------
Offering price per share (100/96.25 of $10.25)               $     10.65
- -------------------------------------------------------------------------
On sales of $50,000 or more, the offering price is reduced.

<CAPTION> 

Statement of Operations

For the Six Months Ended
June 30, 1997
Investment Income (Note 1B)
- -------------------------------------------------------------------------
<S>                                                          <C> 
Interest income                                              $ 2,934,844
- -------------------------------------------------------------------------
Total investment income                                      $ 2,934,844
- -------------------------------------------------------------------------

Expenses
- -------------------------------------------------------------------------
Investment management fee earned by Adviser General
Partner (Note 4)                                             $   217,940
Compensation of Director General Partners not members
  of the Adviser General Partner's organization (Note 4)           3,485
Legal and accounting services                                     41,079
Printing and postage                                              23,331
Custodian fee (Note 1F)                                           22,464
Transfer and dividend disbursing agent fees                       15,528
Registration fees                                                 14,029
Miscellaneous                                                     18,837
- -------------------------------------------------------------------------
Total expenses                                               $   356,693
- -------------------------------------------------------------------------
Deduct --
    Reduction of custodian fee (Note 1F)                     $    15,556
- -------------------------------------------------------------------------
Total expense reductions                                     $    15,556
- -------------------------------------------------------------------------

Net expenses                                                 $   341,137
- -------------------------------------------------------------------------

Net investment income                                        $ 2,593,707
- -------------------------------------------------------------------------

Realized and Unrealized
Gain (Loss) on Investments
- -------------------------------------------------------------------------
Net realized gain (loss) --
    Investment transactions (identified cost basis)          $   760,050
    Financial futures contracts                                 (323,989)
- -------------------------------------------------------------------------
Net realized gain on investment transactions                 $   436,061
- -------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --
    Investments (identified cost basis)                      $ 1,171,951
    Financial futures contracts                                  (55,000)
- -------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation) of
investments                                                  $ 1,116,951
- -------------------------------------------------------------------------

Net realized and unrealized gain on investments              $ 1,553,012
- -------------------------------------------------------------------------

Net increase in net assets from operations                   $ 4,146,719
- -------------------------------------------------------------------------
</TABLE> 

                       See notes to financial statements

                                       6
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets

<TABLE> 
<CAPTION> 

                                   Six Months Ended
Increase (Decrease)                June 30, 1997       Year Ended
in Net Assets                      (Unaudited)         December 31, 1996
- -------------------------------------------------------------------------
<S>                                <C>                 <C> 
From operations --
    Net investment income              $  2,593,707         $  5,575,857
    Net realized gain (loss) on
        investment transactions             436,061              (91,627)
    Net change in unrealized
        appreciation (depreciation)
        of investments                    1,116,951           (1,303,829)
- -------------------------------------------------------------------------
Net increase in net assets
    from operations                    $  4,146,719         $  4,180,401
- -------------------------------------------------------------------------
 Distributions to partners --
    From net investment income         $ (2,593,707)        $ (5,457,518)
    In excess of net investment
        income                              (31,649)             (78,153)
- -------------------------------------------------------------------------
Total distributions to partners        $ (2,625,356)        $ (5,535,671)
- -------------------------------------------------------------------------
Transactions in shares of
    partnership interest (Note2) --
    Proceeds from sales of shares      $  4,509,866         $  3,090,691
    Net asset value of shares
        issued to shareholders
        in payment of distributions
        declared                          1,378,695            2,960,279
    Cost of shares redeemed              (6,454,039)         (12,922,047)
- -------------------------------------------------------------------------
Net decrease in net assets from
    transactions in shares of
    partnership interest (Note 2)      $   (565,478)        $ (6,871,077)
- -------------------------------------------------------------------------

Net increase (decrease) in net
    assets                             $    955,885         $ (8,226,347)
- -------------------------------------------------------------------------


Net Assets
- -------------------------------------------------------------------------
At beginning of period                 $ 88,183,659         $ 96,410,006
- -------------------------------------------------------------------------
At end of period                       $ 89,139,544         $ 88,183,659
- -------------------------------------------------------------------------

Accumulated
distributions in excess of 
net investment income
included in net assets
- -------------------------------------------------------------------------
At end of period                       $   (109,802)        $    (78,153)
- -------------------------------------------------------------------------
</TABLE> 


                       See notes to financial statements

                                       7
<PAGE>

Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

FINANCIAL STATEMENTS CONT'D

Financial Highlights

<TABLE> 
<CAPTION> 
                                                        Six Months Ended                   Year Ended December 31,
                                                         June 30, 1997     -------------------------------------------------------
                                                          (Unaudited)       1996      1995       1994        1993        1992
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>           <C>       <C>        <C>        <C>         <C> 
Net asset value - beginning of period                       $10.070       $10.210    $ 9.260    $10.630     $  9.950    $  9.750
- ----------------------------------------------------------------------------------------------------------------------------------


Income (loss) from operations
- ----------------------------------------------------------------------------------------------------------------------------------
Net investment income                                       $ 0.296        $0.605    $ 0.604    $ 0.611     $  0.614    $  0.639
Net realized and unrealized gain (loss) on investments        0.184        (0.143)     0.962     (1.369)       0.692       0.195
- ----------------------------------------------------------------------------------------------------------------------------------
Total income (loss) from operations                         $ 0.480        $0.462    $ 1.566    $(0.758)    $  1.306    $  0.834
- ----------------------------------------------------------------------------------------------------------------------------------


Less distributions
- ----------------------------------------------------------------------------------------------------------------------------------
From net investment income                                  $(0.296)      $(0.594)   $(0.604)   $(0.611)    $ (0.619)   $ (0.634)
In excess of net investment income                           (0.004)       (0.008)    (0.012)    (0.001)      (0.007)         --
- ----------------------------------------------------------------------------------------------------------------------------------
Total distributions                                         $(0.300)      $(0.602)   $(0.616)   $(0.612)    $ (0.626)   $ (0.634)
- ----------------------------------------------------------------------------------------------------------------------------------


Net asset value - end of period                             $10.250       $10.070    $10.210    $ 9.260     $ 10.630    $  9.950
- ----------------------------------------------------------------------------------------------------------------------------------


Total Return/(1)/                                              4.89%         4.78%     17.40%     (7.27)%      13.52%       8.91%
- ----------------------------------------------------------------------------------------------------------------------------------


Ratios/Supplemental Data
- ----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (000 omitted)                     $89,140       $88,184    $96,410    $90,802     $114,425    $103,208
Ratio of net expenses to average daily net assets /(2)/        0.83%+        0.78%      0.76%      0.80%        0.72%       0.74%
Ratio of net expenses to average daily net assets after
    custodian fee reduction                                    0.79%+        0.74%        --         --           --          --
Ratio of net investment income to average daily                5.97%+        6.12%      6.16%      6.26%        5.91%       6.50%
    net assets
Portfolio Turnover                                               13%           30%        58%        58%          86%         60%
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

+   Annualized.

/(1)/ Total return is calculated assuming a purchase at the net asset value on
      the first day and a sale at the net asset value on the last day of each
      period reported. Dividends and distributions, if any, are assumed to be
      reinvested at the net asset value on the payable date. Total return is not
      computed on an annualized basis.

/(2)/ The expense ratios for the year ended December 31, 1995 and periods
      thereafter have been adjusted to reflect a change in reporting
      requirements. The new reporting guidelines require the Fund to increase
      its expense ratio by the effect of any expense offset arrangements with
      its service providers. The expense ratios for the periods ended on or
      before December 31, 1994 have not been adjusted to reflect this change.


                       See notes to financial statements

                                       8
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

NOTES TO FINANCIAL STATEMENTS (Unaudited)

1  Significant Accounting Policies
   -----------------------------------------------------------------------------
   The Fund is a limited partnership formed under the laws of the State of
   California, and is registered under the Investment Company Act of 1940, as
   amended, as a diversified, open-end management investment company. Under the
   Partnership Agreement, all partnership interests, whether of a limited
   partner or a general partner, are represented by shares of the same class.
   The following is a summary of significant accounting policies consistently
   followed by the Fund in the preparation of its financial statements. The
   policies are in conformity with generally accepted accounting principles.

   A Investment Valuations -- Municipal bonds are normally valued on the basis
   of valuations furnished by a pricing service. Taxable obligations, if any,
   for which price quotations are readily available are normally valued at the
   mean between the latest available bid and asked prices. Futures contracts and
   options on financial futures contracts listed on commodity exchanges are
   valued at closing settlement prices. Over-the-counter options on financial
   futures are normally valued at the mean between the latest bid and asked
   prices. Investments, if any for which there are no such valuations are valued
   at fair value using methods determined in good faith by or at the direction
   of the Director General Partners. Short-term obligations, maturing in sixty
   days or less, are valued at amortized cost, which approximates value.

   B Income -- Interest income is determined on the basis of interest accrued
   and discount earned, adjusted for amortization of premium or discount on
   long-term debt securities when required for federal income tax purposes.

   C Income Taxes -- Interest income received by the Fund on investments in
   municipal bonds, which is excludable from gross income under the Internal
   Revenue Code, will retain its status as income exempt from federal income tax
   when allocated to the Fund's partners. The portion of such interest, if any,
   earned on private activity bonds issued after August 7, 1986, may be
   considered a tax preference item for shareholders. No provision is made by
   the Fund for federal or state taxes on any taxable income of the partnership
   because each partner is individually responsible for the payment of any taxes
   on his share of such taxable income.

   D Financial Futures Contracts -- Upon the entering of a financial futures
   contract, the Fund is required to deposit ("initial margin") either in cash
   or securities an amount equal to a certain percentage of the purchase price
   indicated in the financial futures contract. Subsequent payments are made or
   received by the Fund ("margin maintenance") each day, dependent on the daily
   fluctuations in the value of the underlying security, and are recorded for
   book purposes as unrealized gains or losses by the Fund. The Fund's
   investment in financial futures contracts is designed only to hedge against
   anticipated future changes in interest rates. Should interest rates move
   unexpectedly, the Fund may not achieve the anticipated benefits of the
   financial futures contracts and may realize a loss.

   E Other -- Investment transactions are accounted for on a trade date basis.
   Distributions to partners and shares of partnership interest issued in
   payment thereof are recorded on the ex-date.

   F Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian of the Fund. Pursuant to the custodian agreement, IBT receives a
   fee reduced by credits which are determined based on the average daily cash
   balances the Fund maintains with IBT. All significant credit balances used to
   reduce the Fund's custodian fees are reported as a reduction of expenses in
   the Statement of Operations.

   G Use of Estimates -- The preparation of financial statements in conformity
   with generally accepted accounting principles requires management to make
   estimates and assumptions that affect the reported amounts of assets and
   liabilities at the date of the financial statements and the reported amounts
   of revenue and expense during the reporting period. Actual results could
   differ from those amounts.

   H Put Options on Financial Futures Contracts -- Upon the purchase of a put
   option on a financial futures contract by the Fund, the premium paid is
   recorded as an investment, the value of which is marked-to-market daily. When
   a purchased option expires, the Fund will realize a loss in the amount of the
   cost of the option. When the Fund enters into a closing sale transaction, the
   Fund will

                                       9
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


   realize a gain or loss depending on whether the sales proceeds from the
   closing sale transaction are greater or less than the cost of the option.
   When the Fund exercises a put option, settlement is made in cash. The risk
   associated with purchasing options is limited to the premium originally paid.

   I When-issued and Delayed Delivery
   Transactions -- The Fund may engage in when-issued or delayed delivery
   transactions. The Fund records when-issued securities on trade date and
   maintains security positions such that sufficient liquid assets will be
   available to make payment for the securities purchased. Securities purchased
   on a when-issued or delayed delivery basis are marked-to-market daily and
   begin accruing interest on settlement date.

   J Interim Financial Information -- The interim financial statements relating
   to June 30, 1997 and for the six month period then ended have not been
   audited by independent certified public accountants, but in the opinion of
   the Fund's management, reflect all adjustments, consisting only of normal
   recurring adjustments, necessary for the fair presentation of the financial
   statements.


2  Shares of Partnership Interest
   ----------------------------------------------------------------------------
   Transactions in shares of partnership interest were as follows:

<TABLE> 
<CAPTION> 
                                         Six Months Ended June 30, 1997 
                                         (Unaudited)                         
     -------------------------------------------------------------------------
                                     General Partners    Limited Partners    
     <S>                             <C>                 <C>                  
     Sales                                         --             451,332   
                                                                            
     Issued to partners electing             
      to receive payment of 
      distributions in shares                   4,152             134,069    
                                                                            
     Redemptions                                   --            (647,620)  
     -------------------------------------------------------------------------
     Net increase (decrease)                    4,152             (62,219)    
     -------------------------------------------------------------------------
</TABLE> 

<TABLE> 
<CAPTION> 
                                         Year Ended December 31, 1996
     -------------------------------------------------------------------------
                                     General Partners    Limited Partners    
     <S>                             <C>                 <C>                  
     Sales                                         --             310,886

     Issued to partners electing 
      to receive payment of                     
      distributions in shares                   8,002             290,439

     Redemptions                                   --          (1,301,059)
     -------------------------------------------------------------------------
     Net increase (decrease)                    8,002            (699,734)
     -------------------------------------------------------------------------
</TABLE> 

3  Purchases and Sales of Investments
   -----------------------------------------------------------------------------
   The Fund invests primarily in debt securities. The ability of the issuers of
   the debt securities held by the Fund to meet their obligations may be
   affected by economic developments in a specific industry or municipality.
   Purchases and sales of investments, other than short-term obligations and put
   option transactions, aggregated $11,179,379 and $15,627,702, respectively.

4  Investment Adviser Fee and Other Transactions
   with Affiliates
   -----------------------------------------------------------------------------
   The investment management fee, computed at the monthly rate of 0.025% (0.300%
   per annum) of average daily net assets and 3.00% of gross income (excluding
   net realized gains on sales of securities) up to $500 million and at reduced
   rates as daily net assets exceed that level, was earned by Eaton Vance
   Management (EVM), the Adviser General Partner, as compensation for management
   and investment advisory services rendered to the Fund. For the six-months
   ended June 30, 1997, the fee was equivalent to 0.50% (annualized) of the
   Fund's average net assets for such period and amounted to $217,940. Except as
   to Director General Partners who are not members of EVM's organization,
   officers and Director General Partners receive remuneration for their
   services to the Fund out of such investment management fee. Eaton Vance
   Distributors, Inc., a subsidiary of EVM and the Fund's principal underwriter,
   received $36 as its portion of the sales charge on sales of partnership
   interest in the Fund. Certain of the Director General Partners of the Fund
   are directors/trustees and/or officers of the above organizations. Director
   General Partners of the Fund that are not affiliated with the Investment
   Advisor may elect to defer receipt of all or a

                                       10
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P. as of June 30, 1997

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


   percentage of their annual fees in accordance with the terms of the Trustees
   Deferred Compensation Plan. For the six months ended June 30, 1997, no
   significant amounts have been deferred.

5  Line of Credit
   -----------------------------------------------------------------------------
   The Fund participates with other portfolios and funds managed by EVM and
   affiliates in a committed $120 million unsecured line of credit with a group
   of banks. Borrowings will be made by the Fund solely to facilitate the
   handling of unusual and/or unanticipated short-term cash requirements.
   Interest is charged to each participating portfolio or fund based on its
   borrowings at the bank's base rate or at an amount above either the bank's
   adjusted certificate of deposit rate, a Eurodollar rate, or a federal funds
   rate. In addition, a fee computed at an annual rate of 0.15% on the daily
   unused portion of the line of credit is allocated among the participating
   funds and portfolios at the end of each quarter. The Fund did not have any
   significant borrowing or allocated fees during the six months ended June 30,
   1997.

6  Federal Income Tax Basis of Investments
   -----------------------------------------------------------------------------
   The cost and unrealized appreciation/depreciation in value of the investments
   owned at June 30, 1997, as computed on a federal income tax basis, were as
   follows:

<TABLE> 
      <S>                                  <C> 
      Aggregate cost                       $ 78,328,476
      ---------------------------------------------------
      Gross unrealized appreciation        $  8,284,999
      Gross unrealized depreciation               8,730
      ---------------------------------------------------
      Net unrealized appreciation          $  8,276,269
      ---------------------------------------------------
</TABLE> 

7  Distributions
   -----------------------------------------------------------------------------
   On July 1, 1997, the Director General Partner declared a distribution of
   $0.050 per share payable July 15, 1997, to partners of record on July 1,
   1997.

8  Financial Instruments
   -----------------------------------------------------------------------------
   The Fund regularly trades in financial instruments with off-balance sheet
   risk in the normal course of its investing activities to assist in managing
   exposure to various market risks. These financial instruments include futures
   contracts and may involve, to a varying degree, elements of risk in excess of
   the amounts recognized for financial statement purposes. The notional or
   contractual amounts of these instruments represent the investment the Fund
   has in particular classes of financial instruments and does not necessarily
   represent the amounts potentially subject to risk. The measurement of the
   risks associated with these instruments is meaningful only when all related
   and offsetting transactions are considered. A summary of obligations under
   these financial instruments at June 30, 1997 is as follows:

<TABLE> 
<CAPTION> 

                                      
      Futures                                                  Net Unrealized
      Contracts                                                Appreciation
      Expiration Date   Contracts                   Position   (Depreciation)
      -----------------------------------------------------------------------  
      <S>               <C>                         <C>        <C> 
      9/97              53  U.S. Treasury Bonds     Short      $   (55,000)
      -----------------------------------------------------------------------  
</TABLE> 

                                       11
<PAGE>
 
Eaton Vance Municipal Bond Fund, L.P.  as of June 30, 1997

INVESTMENT MANAGEMENT

Eaton Vance Municipal Bond Fund, L.P.


Director General Partners

Landon T. Clay
Chairman, Eaton Vance 
Management

Donald R. Dwight
President, Dwight
Partners, Inc.
Chairman, Newspapers of 
New England, Inc.

Samuel L. Hayes, III
Jacob H. Schiff Professor
of Investment Banking, 
Harvard University
Graduate School of
Business Administration

Norton H. Reamer
President and Director, 
United Asset Management 
Corporation

John L. Thorndike
Formerly Director, Fiduciary 
Company Incorporated

Jack L. Treynor
Investment Adviser and 
Consultant


Officers
Landon T. Clay
Chairman, Eaton Vance Management

John L. Thorndike
Formerly Director, Fiduciary
Company Incorporated

Thomas J. Fetter
President and Portfolio Manager

James L. O'Conner
Treasurer

Alan R. Dynner
Secretary

                                       12
<PAGE>


 
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<PAGE>

 
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<PAGE>
 

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<PAGE>
 
Investment Advisor
Eaton Vance Management
24 Federal Street
Boston, MA 02110


Principal Underwriter
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(617) 482-8260


Custodian
Investors Bank & Trust Company
200 Clarendon Street, 16th Floor
Boston, MA 02116


Transfer Agent
First Data Investor Services Group
Attention:  Eaton Vance Funds
P.O. Box 5123
Westborough, MA 01581-5123


Independent Auditors
Deloitte & Touche LLP
125 Summer Street
Boston, MA 02110







Eaton Vance
Municipal Bond Fund L.P.
24 Federal Street
Boston, MA 02110


- --------------------------------------------------------------------------------
This report must be preceded or accompanied by a current prospectus which
contains more complete information on the Fund, including its sales charges and
expenses. Please read the prospectus carefully before you invest or send money.
- --------------------------------------------------------------------------------

                                                                    T-MBSRC-8/97


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