DREYFUS ONE HUNDRED PERCENT US TREASURY LONG TERM FUND
N-30D, 1999-09-01
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Dreyfus U.S. Treasury Long Term Fund

SEMIANNUAL REPORT June 30, 1999

(reg.tm)

<PAGE>

The  views  expressed herein are current to the date of this report. These views
and  the  composition  of the fund's portfolio are subject to change at any time
based on market and other conditions.

   * Not FDIC-Insured
   * Not Bank-Guaranteed
   * May Lose Value

Year 2000 Issues (Unaudited)

The fund could be adversely affected if the computer systems used by The Dreyfus
Corporation and the fund's other service providers do not properly process and
calculate date-related information from and after January 1, 2000. The Dreyfus
Corporation is working to avoid Year 2000-related problems in its systems and to
obtain assurances from other service providers that they are taking similar
steps. In addition, issuers of securities in which the fund invests may be
adversely affected by Year 2000-related problems. This could have an impact on
the value of the fund's investments and its share price.



<PAGE>

                                 Contents

                                 THE FUND
- --------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                             8   Statement of Financial Futures

                            10   Statement of Assets and Liabilities

                            11   Statement of Operations

                            12   Statement of Changes in Net Assets

                            13   Financial Highlights

                            14   Notes to Financial Statements

                                 FOR MORE INFORMATION
- ---------------------------------------------------------------------------

                                 Back Cover

<PAGE>


                                                                       The Fund

                                                          Dreyfus U.S. Treasury

                                                                 Long Term Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We  are pleased to present this semiannual report for Dreyfus U.S. Treasury Long
Term  Fund,  covering the six-month period from January 1, 1999 through June 30,
1999.  Inside,  you' ll find valuable information about how the fund was managed
during  the  reporting  period,  including  a  discussion with Gerald Thunelius,
portfolio manager and a member of the Dreyfus Taxable Fixed Income Team.

The  past  six  months  have  produced mixed results for fixed-income investors.
That' s  because  economic growth has been stronger than many analysts expected,
fueling  fears  that  inflation pressures may re-emerge. Overseas economies that
had  been in recession -- including Japan and the rest of Asia -- appear to have
begun  to  gain  strength.  The U.S. economy, which is now in its eighth year of
expansion,  has also grown more robustly than expected. In response, the Federal
Reserve raised short-term interest rates modestly on June 30.

In  this economic climate, U.S. Treasury securities declined, giving back all of
the  gains  they  achieved  during  their remarkable rally last summer and fall.
Prices  of  other  types  of  bonds  fell  less  sharply  or remained relatively
unchanged  when  investors  shifted  assets  back  into  market sectors they had
previously   avoided.   Accordingly,   many   corporate  bonds,  mortgage-backed
securities,  asset-backed  securities  and U.S. dollar-denominated foreign bonds
provided higher returns than U.S. Treasuries over the first half of 1999.

We  appreciate  your confidence over the past six months, and we look forward to
your continued participation in Dreyfus U.S. Treasury Long Term Fund.

Sincerely,


Stephen E. Canter

President and Chief Investment Officer

The Dreyfus Corporation

July 15, 1999





<PAGE>

DISCUSSION OF FUND PERFORMANCE

Gerald Thunelius, Portfolio Manager Dreyfus Taxable Fixed Income Team

How did Dreyfus U.S. Treasury Long Term Fund  perform relative to its benchmark

For  the  six-month  period ended June 30, 1999, Dreyfus U.S. Treasury Long Term
Fund  produced  a  total  return of -5.57%,(1) including share price changes and
dividend  income  generated,  compared  to  the  Merrill Lynch Governments, U.S.
Treasury,  Long-Term  Index,  the fund's benchmark, which had a return of -6.49%
 . (2)  During  the  period, the fund paid a dividend of approximately $0.403 per
share, representing an annualized distribution rate per share of 5.49%.(3)

We  attribute  our performance to a generally unfavorable market environment for
U.S.  Treasury  securities during the last six months. As global economies began
to  show signs of improvement from the financial crisis that occurred before the
reporting  period  began,  investors  became more inclined to move away from the
" safe  haven"  provided  by  U.S.  Treasuries.  Instead,  they seemed to prefer
investing  in  securities that carried greater risks but also had the ability to
earn    higher    yields.

What is the fund's investment approach?

As a U.S. Treasury fund, our goal is to provide shareholders with current income
through an investment vehicle that is made up primarily of Treasury bills, notes
and  other  securities  that  are  issued  or  guaranteed  by  the United States
government  or  its  agencies  or instrumentalities. The fund may also invest in
options,  futures,  and enter into repurchase agreements with securities dealers
that are backed by U.S. Treasuries.

Because U.S. Treasury bills and notes are backed by the full faith and credit of
the   U.S.   government,  they  are  generally  considered  to  rank  among  the
highest-credit-quality investments available. By investing in these obligations,
the fund seeks to maintain a high degree of credit safety. Of course, the market
value    of    the    fund'   s    portfolio    securities    and     The   Fun



<PAGE>

DISCUSSION OF FUND PERFORMANCE (CONTINUED)

the  value  of fund shares are not insured or guaranteed by the U.S. government.
The  fund  generally maintains an average dollar-weighted portfolio that exceeds
10 years.

What other factors influenced the fund's performance?

When the Federal Reserve Board cut key short-term interest rates last fall, just
before  the six-month reporting period began, they were concerned about economic
weakness  in  overseas  markets.  Many fixed-income investors had flocked to the
safe haven of U.S. Treasury securities because of these economic concerns.

The Federal Reserve Board's strategy was apparently successful: evidence emerged
in the first quarter of 1999 that troubled economies in Japan and Southeast Asia
had  begun to recover. Because investors were reassured that the worst was over,
they  shifted their assets away from U.S. Treasuries and into riskier securities
that  offered  higher  potential  returns.  This  exodus  caused  U.S.  Treasury
securities to substantially underperform other types of fixed-income securities

A  continuation of robust U.S. economic growth during the second quarter of 1999
caused  additional  deterioration  of  Treasury securities prices when investors
became  concerned  that  the  Federal Reserve might reverse course and raise key
short-term  interest  rates  to fight inflation. By the time the Federal Reserve
actually  implemented  modestly  higher interest rates on June 30, investors had
already  translated  their  expectations  into  lower  prices  on  U.S. Treasury
securities.

What is the fund's current strategy?

To  earn  as  much yield as possible from our holdings, we purchased off-the-run
(" OTR") Treasuries, which are Treasury securities that were issued prior to the
most  recent  auction process. The benefit to owning OTR Treasuries is that they
tend  to  produce  higher yields because they are often considered slightly less
liquid    than    recent    issues.

U.S.  agency  securities  provided somewhat better returns than U.S. Treasuries,
partly   because   they   were   the   recipients   of   some   of   the  asset

<PAGE>


that  were  moving away from Treasuries. Toward the end of the six-month period,
we  decreased  our  Treasury exposure, choosing instead to redeploy those assets
into  agency  securities  that  offered  higher  returns.  As  of June 30, 1999,
approximately 24% of the portfolio's assets were allocated to agency bonds.

Another  contributor  to  positive performance was the fund's investments in the
Treasury Inflation Protection Securities market. We bought these bonds when they
were   selling   at  what  we  believed  were  inexpensive  prices  relative  to
conventional  Treasury  securities.  In  an environment characterized by growing
fears of inflation, these bonds provided positive returns for the fund.

We  believe  we' ve  created  a  portfolio that is conservative in nature and is
designed  to provide investors with a competitive level of income, liquidity and
preservation    of    capital.

July 15, 1999

(1)  TOTAL RETURN INCLUDES REINVESTMENT OF DIVIDENDS AND ANY CAPITAL GAINS PAID.
PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. SHARE PRICE, YIELD AND
INVESTMENT RETURN FLUCTUATE SUCH THAT UPON REDEMPTION, FUND SHARES MAY BE WORTH
MORE OR LESS THAN THEIR ORIGINAL COST.

(2)  THE MERRILL LYNCH GOVERNMENTS, U.S. TREASURY, LONG-TERM INDEX IS AN
UNMANAGED PERFORMANCE BENCHMARK FOR TREASURY SECURITIES WITH MATURITIES OF 10
YEARS AND OVER; ISSUES IN THE INDEX MUST HAVE PAR AMOUNTS OUTSTANDING GREATER
THAN OR EQUAL TO $1 BILLION.

(3)  DISTRIBUTION RATE PER SHARE IS BASED UPON DIVIDENDS PER SHARE PAID FROM NET
INVESTMENT INCOME DURING THE PERIOD (ANNUALIZED), DIVIDED BY THE NET ASSET VALUE
PER SHARE AT THE END OF THE PERIOD.

                                                             The Fund

<PAGE>


STATEMENT OF INVESTMENTS


<TABLE>
<CAPTION>


June 30, 1999 (Unaudited)

                                                                                    Principal
BONDS AND NOTES--79.0%                                                              Amount ($)                 Value ($)
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                       <C>
U.S. GOVERNMENT AGENCIES--24.3%

Federal Farm Credit Bank,

     Notes, 5.85%, 6/10/2005                                                        4,000,000                  3,907,840

Federal Home Loan Banks,

     Medium-Term Notes, 6.34%, 6/13/2005                                            4,200,000                  4,203,906

Federal Home Loan Mortgage,

     Medium-Term Notes, 5.59%, 9/9/2005                                            10,000,000                  9,629,800

Federal National Mortgage Association,

     Medium-Term Notes, 5.9%, 7/9/2003                                              7,000,000                  6,935,880

U.S. Government Gtd. Development,

   Participation Ctfs.

   (Gtd. By U.S. Small Business Administration):

          Ser. 1997-20, Cl. E, 7.3%,  5/1/2017                                      1,695,209                  1,720,814

          Ser. 1998-20, Cl. E, 6.3%, 5/1/2018                                         974,746                    941,319

          Ser. 1998-20, Cl. J, 5.5%, 10/1/2018                                      1,771,313                  1,635,241

          Ser. 1998-20, Cl. L, 5.8%, 12/1/2018                                      2,952,352                  2,777,927

                                                                                                              31,752,727

U.S. TREASURY BONDS-20.8%

     8.5%, 2/15/2020                                                               7,000,000                   8,763,440

     9.125%, 5/15/2018                                                             3,000,000                   3,931,560

     12%, 8/15/2013                                                                5,000,000                   7,001,350

     12.5%, 8/15/2014                                                              5,000,000                   7,365,750

                                                                                                              27,062,100

U.S. TREASURY NOTES-6.8%

     5.5%, 5/15/2009                                                               9,100,000                   8,909,628

U.S. TREASURY PRINCIPAL STRIPS -27.1%

     Zero Coupon, 5/15/2005                                                        1,200,000                     851,424

     Zero Coupon, 11/15/2009                                                      65,000,000                  34,468,850

                                                                                                              35,320,274

TOTAL BONDS AND NOTES

     (cost $105,749,728)                                                                                     103,044,729
- --------------------------------------------------------------------------------------------------------------------------------


OPTIONS--.0%                                                                         Contracts
- --------------------------------------------------------------------------------------------------------------------------------

CALL OPTIONS;

U.S. Treasury Notes, 4.75%, 11/15/2008,

   December '99 @ $100.375

     (cost $365,625)                                                                     150                       9,900


<PAGE>


                                                                                    Principal
SHORT-TERM INVESTMENTS-20.0%                                                        Amount ($)                 Value ($)
- --------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY BILLS:

     4.39%, 7/8/1999                                                                   600,000  (a)              599,609

     4.19%, 7/22/1999                                                               15,175,000  (a)           15,138,701

     4.42%, 8/5/1999                                                                   150,000  (a)              149,438

     4.34%, 8/19/1999                                                                7,840,000  (a)            7,793,258

     4.58%, 9/16/1999                                                                1,460,000  (a)            1,445,696

     4.7%, 9/30/1999                                                                 1,020,000                 1,008,005

     (cost $26,134,060)                                                                                       26,134,707
- --------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $132,249,413)                                                    99.0%               129,189,336

CASH AND RECEIVABLES (NET)                                                                1.0%                 1,312,019

NET ASSETS                                                                              100.0%               130,501,355

(A)  HELD WHOLE OR IN PART BY THE CUSTODIAN IN A SEGREGATED ACCOUNT AS COLLATERAL FOR OPEN FINANCIAL FUTURES POSITIONS.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

<PAGE>


STATEMENT OF FINANCIAL FUTURES

<TABLE>
<CAPTION>

June 30, 1999 (Unaudited)

                                                                                                                   Unrealized
                                                                   Market Value                                  Appreciation
                                                                     Covered by                                (Depreciation)
                                            Contracts             Contracts ($)             Expiration         at 6/30/99 ($)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                               <C>               <C>
FINANCIAL FUTURES LONG

U.S. Treasury 5 Year Notes                        178               19,402,000           September '99               45,438

U.S. Treasury 10 Year Notes                       477               53,036,438           September '99             (349,320)

U.S. Treasury 30 Year Bonds                       228               26,426,625           September '99              309,000

FINANCIAL FUTURES SHORT

U.S. Treasury 2 Year Notes                        349               72,570,188           September '99             (158,047)

TOTAL                                                                                                              (152,929)
</TABLE>



<PAGE>


STATEMENT OF OPTIONS WRITTEN

June 30, 1999 (Unaudited)

Call Options

ISSUER                                          Contracts            Value ($)
- -------------------------------------------------------------------------------

U.S. Treasury Notes, 4.75%, 11/15/2008,
December '99 @ $104.78125                             150                  987

Put Options

ISSUER
- -------------------------------------------------------------------------------

U.S. Treasury Notes, 4.75%, 11/15/2008,
December '99 @ $95.125                                150              681,450

   (Premiums received $365,625)                                        682,437

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

<PAGE>


STATEMENT OF ASSETS AND LIABILITIES

June 30, 1999 (Unaudited)

                                                             Cost         Value
- -------------------------------------------------------------------------------

ASSETS ($):

Investments in securities--See Statement of
Investments                                           132,249,413   129,189,336

Cash                                                                    304,839

Interest receivable                                                   1,248,342

Receivable for futures variation margin-Note 4(a)                       454,995

Paydowns receivable                                                      89,223

Receivable for shares of Beneficial Interest subscribed                  42,646

Prepaid expenses and other assets                                        39,588

                                                                    131,368,969
- -------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                            55,363

Outstanding options written, at value (premiums
   received $365,625)--See Statement of Options Written                 682,437

Payable for shares of Beneficial Interest redeemed                       94,470

Accrued expenses                                                         35,344

                                                                        867,614
- -------------------------------------------------------------------------------

NET ASSETS ($)                                                      130,501,355
- -------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     145,812,338

Accumulated net realized gain (loss) on investments and
   financial futures                                                (11,781,165)

Accumulated net unrealized appreciation (depreciation)
   on investments [including ($152,929)
   net unrealized depreciation on financial futures]--Note 4(b)      (3,529,818)
- -------------------------------------------------------------------------------

NET ASSETS ($)                                                      130,501,355
- -------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of
   Beneficial Interest authorized)                                    8,803,857
- -------------------------------------------------------------------------------

NET ASSET VALUE, offering and redemption price per share ($)              14.82

SEE NOTES TO FINANCIAL STATEMENTS.


<PAGE>


STATEMENT OF OPERATIONS

Six Months Ended June 30, 1999 (Unaudited)


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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      4,065,667

EXPENSES:

Management fee--Note 3(a)                                              402,939

Shareholder servicing costs--Note 3(b)                                 210,314

Professional fees                                                       23,958

Trustees' fees and expenses--Note 3(c)                                  16,914

Registration fees                                                       12,456

Custodian fees--Note 3(b)                                                9,781

Prospectus and shareholders' reports                                     6,889

Loan commitment fees--Note 2                                               332

Miscellaneous                                                            2,529

TOTAL EXPENSES                                                         686,112

Less--reduction in management fee due to undertaking--Note 3(a)       (148,528)

NET EXPENSES                                                           537,584

INVESTMENT INCOME--NET                                               3,528,083
- -------------------------------------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS--NOTE 4 ($):

Net realized gain (loss) on investments and options written         (7,165,291)

Net realized gain (loss) on financial futures                       (1,103,541)

NET REALIZED GAIN (LOSS)                                            (8,268,832)

Net unrealized appreciation (depreciation) on investments
   [including ($152,929) net unrealized (depreciation)
   on financial futures]                                            (2,906,835)

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS             (11,175,667)

NET (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS              (7,647,584)

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

<PAGE>


STATEMENT OF CHANGES IN NET ASSETS

                                             Six Months Ended
                                                June 30, 1999         Year Ended
                                                  (Unaudited)  December 31, 1998
- -------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                              3,528,083         6,997,579

Net realized gain (loss) on investments            (8,268,832)       11,171,370

Net unrealized appreciation (depreciation)
   on investments                                  (2,906,835)       (4,493,318)

NET INCREASE (DECREASE) IN NET ASSETS

   RESULTING FROM OPERATIONS                       (7,647,584)        13,675,631
- -------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

Investment income--net                             (3,528,083)       (6,997,579)
- -------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($):

Net proceeds from shares sold                      68,155,057        87,599,125

Dividends reinvested                                2,127,636         4,275,403

Cost of shares redeemed                           (70,491,010)      (91,359,590)

INCREASE (DECREASE) IN NET ASSETS FROM

   BENEFICIAL INTEREST TRANSACTIONS                  (208,317)          514,938

TOTAL INCREASE (DECREASE) IN NET ASSETS           (11,383,984)        7,192,990
- -------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                               141,885,339       134,692,349

END OF PERIOD                                     130,501,355       141,885,339

CAPITAL SHARE TRANSACTIONS (SHARES):

Shares sold                                         4,389,391         5,530,831

Shares issued for dividends reinvested                138,168           272,160

Shares redeemed                                    (4,532,718)       (5,799,835)

NET INCREASE (DECREASE) IN SHARES OUTSTANDING          (5,159)            3,156

SEE NOTES TO FINANCIAL STATEMENTS.


<PAGE>


FINANCIAL HIGHLIGHTS

The  following table describes the performance for the fiscal periods indicated.
Total  return  shows  how  much your investment in the fund would have increased
(or decreased) during each period, assuming you had reinvested all dividends and
distributions.  These  figures  have  been  derived  from  the  fund's financial
statements.

<TABLE>
<CAPTION>


                                   Six Months Ended
                                      June 30, 1999                               Year Ended December 31,
                                                             ----------------------------------------------------------------

                                         (Unaudited)         1998          1997          1996          1995          1994
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>           <C>           <C>            <C>           <C>           <C>
PER SHARE DATA ($):

Net asset value,

   beginning of period                        16.11         15.30         14.61          15.51         13.26         15.68

Investment Operations:

Investment income--net                          .40           .80           .93            .98           .96          1.01

Net realized and unrealized
   gain (loss) on investments                 (1.29)          .81           .69           (.89)         2.25         (2.42)

Total from Investment Operations              (.89)          1.61          1.62            .09          3.21         (1.41)

Distributions:

Dividends from investment

   income--net                                (.40)         (.80)          (.93)          (.99)         (.96)        (1.01)

Net asset value, end of period               14.82         16.11          15.30          14.61         15.51         13.26
- -----------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                         (11.23)(a)        10.77          11.69            .87         24.91         (9.18)
- -----------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to average

   net assets                               .80(a)           .80            .80            .80           .87           .98

Ratio of net investment income

   to average net assets                   5.25(a)          5.10           6.48           6.74          6.69          7.08

Decrease reflected in above
   expense ratios due to
   undertakings by the Manager              .22(a)           .21            .24            .19           .05            --

Portfolio Turnover Rate                  170.19(b)      1,181.48         905.99         765.13        634.38       1,213.04
- -----------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period
   ($ x 1,000)                          130,501          141,885        134,692        135,368       146,445        123,403

(A)  ANNUALIZED.

(B)  NOT ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

<PAGE>


NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  U.S.  Treasury  Long  Term  Fund  (the  "fund") is registered under the
Investment  Company  Act  of  1940,  as  amended  (the  "Act"), as a diversified
open-end  management  investment  company. The fund's investment objective is to
provide  investors  with as high a level of current income as is consistent with
the  preservation  of capital. The Dreyfus Corporation (the "Manager") serves as
the  fund' s  investment  adviser.  The Manager is a direct subsidiary of Mellon
Bank, N.A. ("Mellon").  Premier Mutual Fund Services, Inc. is the distributor of
the fund's shares, which are sold to the public without a sales charge.

The  fund' s  financial  statements  are  prepared  in accordance with generally
accepted accounting principles which may require the use of management estimates
and assumptions. Actual results could differ from those estimates.

(a)   Portfolio  valuation:  Investments  in  securities  (excluding  short-term
investments  other  than U.S. Treasury Bills) are valued each business day by an
independent  pricing  service  (" Service" ) approved  by the Board of Trustees.
Investments   for  which  quoted  bid  prices  are  readily  available  and  are
representative  of the bid side of the market in the judgment of the Service are
valued  at  the  mean  between the quoted bid prices (as obtained by the Service
from  dealers in such securities) and asked prices (as calculated by the Service
based  upon its evaluation of the market for such securities). Other investments
(which  constitute  a  majority of the portfolio securities) are carried at fair
value as determined by the Service, based on methods which include consideration
of:  yields  or prices of securities of comparable quality, coupon, maturity and
type;  indications  as  to  values  from dealers; and general market conditions.
Short-term  investments, excluding U.S. Treasury Bills, are carried at amortized
cost, which approximates values.

(b)  Securities  transactions and investment income: Securities transactions are
recorded  on  a  trade  date  basis.  Realized  gain  and  loss  from securities
transactions  are  recorded  on  the  identified  cost  basis.  Interest income,
including,  where  applicable,  amortization  of  discount  on  investments,  is
recognized    on    the    accrual    basis.    Under    the    terms    of

<PAGE>


the  custody agreement, the fund received net earnings credits of $10,514 during
the period ended June 30, 1999 based on available cash balances left on deposit.
Income earned under this arrangement is included in interest income.

(c) Dividends to shareholders: It is the policy of the fund to declare dividends
daily  from  investment  income-net.  Such dividends are paid monthly. Dividends
from  net realized capital gain are normally declared and paid annually, but the
fund  may  make  distributions  on  a  more  frequent  basis  to comply with the
distribution  requirements of the Internal Revenue Code of 1986, as amended (the
" Code" ). To the extent that net realized capital gain can be offset by capital
loss carryovers, it is the policy of the fund not to distribute such gain.

(d) Federal income taxes: It is the policy of the fund to continue to qualify as
a  regulated  investment company, if such qualification is in the best interests
of  its  shareholders,  by complying with the applicable provisions of the Code,
and  to  make  distributions  of  taxable  income  sufficient to relieve it from
substantially all Federal income and excise taxes.

The  fund  has  an  unused  capital  loss  carryover of approximately $2,947,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent  to  December 31, 1998. The
carryover  does not include net realized securities losses from November 1, 1998
through  December  31, 1998, which are treated, for Federal income tax purposes,
as arising in fiscal 1999. If not applied, the carryover expires in fiscal 2004

NOTE 2--Bank Line of Credit:

The  fund  participates  with  other  Dreyfus-managed  funds  in  a $600 million
redemption  credit  facility  (the  "Facility" ) to be utilized for temporary or
emergency  purposes,  including  the  financing  of  redemptions.  In connection
therewith, the fund has agreed to pay commitment fees on its pro rata portion of
the  Facility.   Interest  is  charged  to the fund at rates based on prevailing
market  rates  in effect at the time of borrowing.  During the period ended June
30,    1999,    the    fund    did    not    borrow    under   the   Facility.

                                                             The Fund

<PAGE>


NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

NOTE 3--Management Fee and Other Transactions With Affiliates:

(a)  Pursuant  to a management agreement with the Manager, the management fee is
computed  at  the  annual  rate  of .60 of 1% of the value of the fund's average
daily  net  assets  and  is  payable  monthly.   The Manager had undertaken from
January  1,  1999 through June 30, 1999 to reduce the management fee paid by the
fund,  to  the  extent  that  the fund's aggregate annual expenses, exclusive of
taxes,  brokerage,  interest  on  borrowings,  commitment fees and extraordinary
expenses,  exceeded  an  annual  rate  of  .80  of 1% of the value of the fund's
average  daily  net  assets.  The  reduction  in management fee, pursuant to the
undertaking, amounted to $148,528 during the period ended June 30, 1999.

(b)  Under  the  Shareholder  Services Plan, the fund reimburses Dreyfus Service
Corporation,  a  wholly-owned subsidiary of the Manager, an amount not to exceed
an  annual rate of .25 of 1% of the value of the fund's average daily net assets
for certain allocated expenses of providing personal services and/or maintaining
shareholder  accounts.   The  services  provided  may  include personal services
relating  to  shareholder  accounts,  such  as  answering  shareholder inquiries
regarding  the  fund  and  providing reports and other information, and services
related to the maintenance of shareholder accounts. During the period ended June
30,  1999,  the  fund  was charged $152,407 pursuant to the Shareholder Services
Plan.

The  fund  compensates  Dreyfus Transfer, Inc., a wholly-owned subsidiary of the
Manager,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities  to  perform transfer agency services for the fund. During the period
ended  June  30,  1999,  the  fund  was charged $38,399 pursuant to the transfer
agency agreement.

The  fund  compensates  Mellon under a custody agreement for providing custodial
services  for  the  fund.  During  the  period ended June 30, 1999, the fund was
charged $9,781 pursuant to the custody agreement.

(c)  Each  trustee  who  is  not  an  "affiliated  person" as defined in the Act
receives  from  the  fund  an  annual  fee  of  $2,500  and  an  attendance  fe

<PAGE>


of  $250  per  meeting.  The Chairman of the Board receives an additional 25% of
such compensation and the Trustee Emeritus receives 50% of such compensation.

NOTE 4--Securities Transactions:

(a)  The  aggregate  amount  of  purchases  and  sales  (including  paydowns) of
investment  securities,  excluding  short-term securities, options and financial
futures,  during  the  period  ended June 30, 1999, amounted to $220,323,617 and
$241,578,876, respectively.

In  addition, the following table summarizes the fund's call/put options written
during the period ended June 30, 1999:


<TABLE>
<CAPTION>

                                                                                                    Options Terminated
                                                                                           ----------------------------------

                                                       Number of            Premiums                         Net Realized
Options Written:                                       Contracts         Received ($)      Costs ($)      Gain (Loss) ($)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                                        <C>             <C>             <C>                     <C>
Contracts outstanding
    December 31, 1998                                        300             365,625

Contracts written                                          1,976           2,122,846

Contracts terminated:

    Closed                                                 1,676           1,770,502       1,487,148              283,354

    Exercised                                                300             352,344         352,344                   --

    Expired                                                   --                 --              --                    --

    TOTAL CONTRACTS TERMINATED                             1,976           2,122,846       1,839,492               283,354

Contracts outstanding
    June 30, 1999                                            300             365,625
</TABLE>

The  fund  may  purchase  and  write  (sell)  call/put  options in order to gain
exposure to or protect against changes in the market.

As  a writer of call options, the fund receives a premium at the outset and then
bears  the  market  risk  of  unfavorable  changes in the price of the financial
instruments  underlying the options.  Generally, the fund would incur a gain, to
the  extent  of the premium, if the price of the underlying financial instrument
decreases  between  the  date  the  option  is written and the date on which the
option is terminated.  Generally, the fund would realize a loss, if the price of
the  financial  instrument increases between those dates. Contracts open at June
30, 1999 are set forth in the Statement of Options Written.

As  a  writer of put options, the fund receives a premium at the outset and then
bears  the  market  risk  of  unfavorable  changes  in  the  price  of  The Fun

<PAGE>


NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

the  financial  instruments  underlying  the options.  Generally, the fund would
incur  a  gain,  to  the  extent  of the premium, if the price of the underlying
financial  instrument  increases  between the date the option is written and the
date  on  which  the  option is terminated.  Generally, the fund would realize a
loss,  if  the  price of the financial instrument decreases between those dates.
Contracts  open  at  June  30,  1999  are  set forth in the Statement of Options
Written.

The  fund may invest in financial futures contracts in order to gain exposure to
or  protect against changes in the market. The fund is exposed to market risk as
a  result  of  changes  in  the  value  of the underlying financial instruments.
Investments in financial futures require the fund to "mark to market" on a daily
basis,  which  reflects  the  change in the market value of the contracts at the
close  of  each day's trading. Typically, variation margin payments are received
or  made  to  reflect  daily  unrealized gains or losses. When the contracts are
closed,  the  fund recognizes a realized gain or loss. These investments require
initial  margin  deposits  with  a  custodian,  which  consist  of  cash or cash
equivalents, up to approximately 10% of the contract amount. The amount of these
deposits  is  determined by the exchange or Board of Trade on which the contract
is  traded  and  is  subject to change. Contracts open at June 30, 1999, are set
forth in the Statement of Financial Futures.

(b)  At  June  30, 1999, accumulated net unrealized depreciation on investments,
options  and  financial  futures  was  $3,529,818,  consisting of $936,585 gross
unrealized appreciation and $4,466,403 grossunrealized depreciation.

At  June  30,  1999, the cost of investments for Federal income tax purposes was
substantially  the  same  as  the cost for financial reporting purposes (see the
Statement of Investments).


<PAGE>


NOTES

<PAGE>


                                                           For More Information

                        Dreyfus U.S. Treasury

                        Long Term Fund

                        200 Park Avenue

                        New York, NY 10166

                        Manager

                        The Dreyfus Corporation

                        200 Park Avenue

                        New York, NY 10166

Custodian

Mellon Bank, N.A.

One Mellon Bank Center

Pittsburgh, PA 15258

Transfer Agent &

Dividend Disbursing Agent

Dreyfus Transfer, Inc.

P.O. Box 9671

Providence, RI 02940

Distributor

Premier Mutual Fund Services, Inc.

60 State Street

Boston, MA 02109

To obtain information:

BY TELEPHONE Call 1-800-645-6561

BY MAIL Write to:  The Dreyfus Family of Funds 144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

BY E-MAIL Send your request to [email protected]

ON THE INTERNET Information can be viewed online or downloaded from:

http://www.dreyfus.com

(c) 1999 Dreyfus Service Corporation                                  073SA996



<PAGE>



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