DREYFUS ONE HUNDRED PERCENT US TREASURY LONG TERM FUND
N-30D, 1998-09-04
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DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

LETTER TO SHAREHOLDERS

Dear Shareholder:

  We  are  pleased  to  report on the performance for Dreyfus U.S. Treasury Long
Term  Fund.  For  the  six-month reporting period ended June 30, 1998, your Fund
produced  a  total  return,  including  share  price changes and dividend income
generated,  of  4.58% .* Income dividends paid from net investment income during
the   period  amounted  to  approximately  $0.411  per  share,  representing  an
annualized distribution rate per share of 5.32%.**

THE ECONOMY

  In  recent  months,  economic  developments  overseas  began  to assert a more
vigorous  influence  on the U.S. economy. The first quarter of the 1998 calendar
year  saw the U.S. trade deficit rising to a new high. Exports contracted due to
reduced  foreign  demand  for  U.S. products, which resulted in a marked rise in
business inventories that could create a drag on future production as stockpiles
are  depleted. At the same time, imports surged. Spurred by a strong U.S. dollar
and  robust  consumer  spending,  the  increase in cheaper imports helped dampen
domestic  inflation  since  American  producers  had to restrain their prices in
order to remain competitive. The suppressive effect of the trade deficit on both
domestic  production  and  prices  has  been  fortuitously  in  concert with the
direction    of   Federal   Reserve   Board   (the   Fed)   monetary   policy.

  The  financial  difficulties  that  began in Asia last year have now spread to
Latin  America  and  beyond.  That  tenuous situation and the continued economic
instability  in  Russia  have  contributed  to  the  Fed' s status quo policy in
monetary  matters  since  the  Fed  is concerned that any increase in short-term
interest  rates  would  further  unsettle  world  markets.  The last increase in
short-term  rates came in March 1997 when the Federal Open Market Committee (the
policy-making  arm  of  the Fed) raised the target rate for Federal Funds by one
quarter  of  a  percent to 5.5%. (The Federal Funds rate is the rate of interest
that   banks   charge   each   other   for   the   use   of   Federal   Funds.)

  Consumers,  spurred  by real wage gains and a healthy job market, continued to
spend freely in the retail sector, giving retailers some of their best months in
a  decade.  In the early years of the current eight-year economic expansion, the
retail  portion  of  our  economy at times had lagged since consumers feared job
insecurity  and  a  resurgence  of  inflation.  The  buoyant  stock  market, low
unemployment  rate  and  absence  of inflation, however, encouraged consumers to
spend.  The market for so-called "big ticket" items has been strong: the housing
market  was solid throughout the reporting period and continues to be, while car
and    truck    sales    are    at    ten-year    highs.

  Unemployment  (4.3%  at  the end of the reporting period) is at a 28-year low.
Inflation,  at  both consumer and producer levels, has been dormant. Workers are
benefiting from having their wages rise faster than inflation. The most recently
reported  statistics  on  hourly  wages  (through  April) revealed that over the
previous 12 months, wages rose 4.4% while the Consumer Price Index increased but
1.4% . The  tight  labor  market  and upward pressure on wages, because of their
potential  for  rekindling  inflation,  have  been major concerns of the Federal
Reserve.  The  wage  rate increase of 4.4%, compared to 3.7% and 3.1% in the two
previous    years,    illustrates    the    upward    creep    of    wages.

  Over  the  past  few  years,  gains in worker productivity (output per hour of
work)  have  offset any incipient price pressures from rising wages. Enhanced by
the  widespread  use of technology, productivity rose 1.7% last year and 1.9% in
1996, compared to an average increase of only 1% for the period 1974-1995. These
gains  are  a  key  factor in the continuation of our high-growth, low-inflation
economy.  However,  productivity  gains slowed to 1.1% during the first quarter,
the  slowest  pace  in  over  a  year. So far, our economy has been in a charmed
circle  where  even international financial crises have proven supportive of our
economic  policies.  As  always,  we  remain  alert  for  warning signs that the
delicate  balance  that  now  prevails  in  our  economy  might  be  disturbed.

MARKET ENVIRONMENT

  The  bond  market  has  been  very  strong  from  a fundamental point of view.
Everything  from  reduced  supply of U.S. Treasury debt, to the Asian crisis, to
falling commodity prices has worked in the bond market's favor.

  At  the  time  of this letter, it is very hard to find any sentiment regarding
the  bond  market  that  is  not  bullish.  There  are several themes which have
produced this optimism in the bond market. The first is that Japan may never put
forth  a  credible financial package, which is a key element to ending the Asian
crisis.  Second,  OPEC  members  may  never  actually  adhere to any agreed-upon
cutbacks  in  oil  production,  which  would  keep oil prices from rising. Also,
yields  remain  very high on a global basis. On the domestic front, inflation is
viewed  as  nonexistent.  And,  the  manufacturing sector of the U.S. economy is
already signaling much slower growth ahead.

  The  30-year  Treasury bond is trading in a range of 5.5% to 5.85%. Currently,
the  yield  is  at  the lower end of that range. The above-mentioned themes have
been  talked  about enough that one could assume that at the moment they already
are priced into yield levels.

  When  viewing the above bond market themes, you can see that they are somewhat
intertwined.  If  one  of  them  were to change, the others would be modified as
well.  The Japanese fiscal reform or policy change could have the biggest effect
on  the direction of the others. While it may take years for recoveries to be in
place  for Asia, the direction is important. If the fiscal package from Japan is
credible  and sizable, the financial markets will begin to assume that the worst
is  behind.  This  will  in  turn  lift  commodity prices as people anticipate a
greater  need  in the future. The "zero inflation" scenario could be hindered by
any  rise  in  commodity  prices.  In  fact, core inflation in the U.S. has been
moving  up.  If  it  were  not for the Asian crisis' impact on commodity prices,
fewer    people    would    be    proclaiming    that   inflation   is   dead.

  While  only  time  will  tell, the external pressure being exerted on Japan to
reform  is  great by any historical standards. It is our opinion that Japan will
reform  sooner  than the markets are anticipating (albeit it could take years to
work through), but we are less enthusiastic about the prediction that rates will
fall  precipitously further without more defining news on the bond market themes
discussed above.

PORTFOLIO OVERVIEW

  In  light  of our apprehension about a continued bond market rally, we believe
that  a  neutral  stance  in  duration  is  warranted. Going forward, the target
duration  will be in the area of 9.5 years. Over the last 12 months the duration
of  the  Fund has been as high as 11.0 years, which has worked out well as rates
have declined over that time.

  During  the reporting period, we have positioned the Fund to take advantage of
a  flatter  yield  curve,  which  has  worked  well.  However,  we  believe that
positioning  the  Fund  for  a  steepening yield curve might be warranted in the
future.  The  reasons  for  this are twofold. First, if inflation picks up, even
minimally,  we  expect  30-year  Treasury bonds to underperform shorter maturity
Treasuries.  (Inflation  will eat away at longer maturities.) Or, if the economy
really does slow down, the Fed will remove their tightening bias which will help
shorter  maturities  to  outperform  longer-term Treasuries. Second, in economic
slowdowns  banks  could  tend  to invest capital because loan demand slows. This
would  mean increased interest in purchasing shorter maturity securities. So the
yield curve steepening structure should perform well in both scenarios.

  We  have  allocated  resources  to  "Treasury  Inflation Protected Securities"
(TIPS) . TIPS represent value on a very simple basis: right now 30-year Treasury
bonds  yield  5.63% , and 30-Year TIPS yield 3.68%. This means that if inflation
comes  in at 2% or higher for the year, then TIPS have better relative value. We
plan on maintaining approximately a 15% position in this product.

  Now  that  this  Fund  is  allowed  to  purchase  government-guaranteed agency
securities,  we  have  started to make these types of purchases. We have brought
our agency holdings to almost the maximum of 35%. The yield advantage is between
20  to  25  basis  points over comparable-maturity Treasuries. This will help to
keep a slightly higher income stream.

  The  Fund is also permitted to use futures and options now. The futures market
is  what  we used during the reporting period to position the Fund for a flatter
yield curve. This has worked out well, as the curve did flatten. At this time we
have not found an options position or an idea that warrants usage. We constantly
re-evaluate to decide when the opportunity is right.

                                          Very truly yours,


                                          [Gerald E. Thunelius, signature logo]


                                          Portfolio Manager

June 18, 1998

New York, N.Y.

* Total return includes reinvestment of dividends and any capital gains paid.

**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.


<TABLE>
DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                            JUNE 30, 1998 (UNAUDITED)

                                                                                              Principal

Bonds and Notes--97.6%                                                                         Amount                 Value
- ----------------------------------------------------                                      _______________        ______________

U.S. Government Agencies--33.9%

Federal Farm Credit,
<S>                                                                                        <C>                   <C>
  Notes, 5.85%, 6/10/2005                                                                  $    4,000,000        $    4,015,600

Federal Home Loan Mortgage Corp.,

 Medium Term Notes:

    5.95%, 6/13/2005                                                                           17,200,000            17,286,344

    6.34%, 6/13/2005                                                                            4,200,000             4,340,112

Federal National Mortgage Association:

 Medium-Term Notes,

    6.10%, 5/21/2003                                                                            5,000,000             5,003,450

  Sub. Capital Deb.,

    Zero Coupon, 10/9/2019                                                                     30,000,000             8,547,900

Tennessee Valley Authority,

 Putable Automatic Rate Reset Securities,

  Ser. D, 6.75%, 6/1/2003                                                                       6,000,000             6,030,000

                                                                                                                  _____________

                                                                                                                     45,223,406

                                                                                                                  _____________

U.S. Treasury Bonds--47.3%

  10.75%, 8/15/2005                                                                  .          6,000,000             7,805,940

  8.125%, 5/15/2021                                                                            15,000,000            19,522,500

  8.125%, 8/15/2021                                                                             5,000,000             6,515,600

  8%, 11/15/2021                                                                               10,000,000            12,887,100

  7.625%, 2/15/2025                                                                            13,000,000            16,363,360

                                                                                                                  _____________

                                                                                                                     63,094,500

                                                                                                                  _____________

U.S. Treasury Inflation Protection Securities--14.9%

  3.635%, 7/15/2002                                                                            10,000,000(a)         10,037,009

  3.625%, 4/15/2028                                                                            10,000,000(a)          9,929,262

                                                                                                                  _____________

                                                                                                                     19,966,271

                                                                                                                  _____________

U.S. Treasury Notes--1.5%

  5.50%, 5/31/2003                                                                              2,000,000             1,999,860

                                                                                                                  _____________

TOTAL BONDS AND NOTES

  (cost $128,310,103)                                                                                              $130,284,037

                                                                                                                  =============

</TABLE>
<TABLE>
DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                            JUNE 30, 1998 (UNAUDITED)

                                                                                              Principal

Short-Term Investments--1.4%                                                                   Amount                 Value
- ----------------------------------------------------                                      ________________       _______________

U.S. Government Agencies--.6%

Federal Home Loan Banks,
<S>                                                                                          <C>                  <C>
  5.85%, 7/1/1998                                                                            $     826,000        $     826,000

                                                                                                                  _____________

U.S. Treasury Bills--.8%

  4.83%, 7/23/1998                                                                                 219,000(b)           218,347

  4.90%, 8/27/1998                                                                                 856,000(b)           849,409

                                                                                                                  _____________

                                                                                                                      1,067,756

                                                                                                                  _____________

TOTAL SHORT-TERM INVESTMENTS

  (cost $1,893,708)                                                                                               $   1,893,756

                                                                                                                  =============


TOTAL INVESTMENTS

  (cost $130,203,811)                                                                                 99.0%        $132,177,793

                                                                                                                  =============

CASH AND RECEIVABLES (NET)                                                                             1.0%        $  1,316,217

                                                                                                                  =============

NET ASSETS                                                                                           100.0%        $133,494,010

                                                                                                                  =============

Notes to Statement of Investments:
- -----------------------------------------------------------------------------

(a) Variable  rate  security--base  interest rate shown--adjustment to interest
    rate linked to the Consumer Price Index.

(b) Held  by  the  custodian  in  a  segregated  account as collateral for open
    Financial Futures positions.
</TABLE>
<TABLE>

STATEMENT OF FINANCIAL FUTURES                      JUNE 30, 1998 (UNAUDITED)

                                                                            Market Value                          Unrealized

                                                                               Covered                          (Depreciation)

Financial Futures Short                                     Contracts       by Contracts        Expiration        at 6/30/98

  ____________________                                      ________        ____________      _____________      ____________
<S>                                                           <C>            <C>              <C>                 <C>
U.S. Treasury 30 year Bonds                                   230            $28,426,563      September '98       $(100,625)

                                                                                                                  ==========


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES                 JUNE 30, 1998 (UNAUDITED)

                                                                                                   Cost               Value

                                                                                                _____________      ____________

<S>                                                                                              <C>               <C>
ASSETS:                          Investments in securities--See Statement of Investments         $130,203,811      $132,177,793

                                 Cash                                                                                   115,032

                                 Interest receivable                                                                  1,420,497

                                 Receivable for shares of Beneficial Interest subscribed                                105,584

                                 Prepaid expenses and other assets                                                       40,664

                                                                                                                   ____________

                                                                                                                    133,859,570

                                                                                                                   ____________

LIABILITIES:                     Due to The Dreyfus Corporation and affiliates                                           47,277

                                 Payable for shares of Beneficial Interest redeemed                                     181,030

                                 Payable for futures variation margin--Note 4(a)                                        101,023

                                 Accrued expenses                                                                        36,230

                                                                                                                   ____________

                                                                                                                        365,560

                                                                                                                   ____________

NET ASSETS                                                                                                         $133,494,010

                                                                                                                   ============


REPRESENTED BY:                  Paid-in capital                                                                   $141,855,763

                                 Accumulated net realized gain (loss) on investments                                (10,235,110)

                                 Accumulated net unrealized appreciation (depreciation)
                                   on investments [including ($100,625) net unrealized
                                   (depreciation) on financial futures]--Note 4(b)                                    1,873,357

                                                                                                                   _____________

NET ASSETS                                                                                                         $133,494,010

                                                                                                                   =============


SHARES OUTSTANDING

(UNLIMITED NUMBER OF $.001 PAR VALUE SHARES OF BENEFICIAL INTEREST AUTHORIZED)                                        8,568,370

NET ASSET VALUE, offering and redemption price per share                                                                 $15.58

                                                                                                                         ======


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>

DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

STATEMENT OF OPERATIONS            SIX MONTHS ENDED JUNE 30, 1998 (UNAUDITED)

INVESTMENT INCOME
<S>                                                                                               <C>                   <C>
INCOME                           Interest Income                                                                     $4,140,829

EXPENSES:                        Management fee--Note 3(a)                                        $   401,417

                                 Shareholder servicing costs--Note 3(b)                               191,665

                                 Professional fees                                                     31,396

                                 Registration fees                                                     20,986

                                 Trustees' fees and expenses--Note 3(c)                                20,094

                                 Prospectus and shareholders' reports                                   9,456

                                 Custodian fees--Note 3(b)                                              7,974

                                 Loan commitment fees--Note 2                                             978

                                 Miscellaneous                                                          1,702

                                                                                                   ___________

                                        Total Expenses                                                685,668

                                 Less--reduction in management fee due to
                                    undertaking--Note 3(a)                                           (149,467)

                                                                                                   ___________

                                        Net Expenses                                                                    536,201

                                                                                                                     __________

INVESTMENT INCOME--NET                                                                                                3,604,628

                                                                                                                     __________

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

                                 Net realized gain (loss) on investments                           $5,035,166

                                 Net realized gain (loss) on financial futures                       (586,573)

                                                                                                  ___________

                                        Net Realized Gain (Loss)                                                      4,448,593

                                 Net unrealized appreciation (depreciation) on investments
                                    [including ($100,625) net unrealized (depreciation)
                                    on financial futures]                                                            (1,996,978)

                                                                                                                    ___________

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS                                                                2,451,615

                                                                                                                    ___________

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                                                                 $6,056,243

                                                                                                                    ===========


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS

                                                                                        Six Months Ended

                                                                                         June 30, 1998          Year Ended

                                                                                          (Unaudited)        December 31,1997
                                                                                       ________________      ________________

OPERATIONS:
<S>                                                                                    <C>                    <C>
  Investment income--net                                                               $     3,604,628        $    8,338,854

  Net realized gain (loss) on investments                                                    4,448,593             1,154,534

  Net unrealized appreciation (depreciation) on investments                                 (1,996,978)            4,662,613

                                                                                       ________________       _______________

    Net Increase (Decrease) in Net Assets Resulting from Operations                          6,056,243            14,156,001

                                                                                       ________________       _______________

DIVIDENDS TO SHAREHOLDERS FROM:

  Investment income--net                                                                    (3,604,628)           (8,338,854)

                                                                                       ________________       _______________

BENEFICIAL INTEREST TRANSACTIONS:

  Net proceeds from shares sold                                                             31,246,347            68,522,044

  Dividends reinvested                                                                       2,209,316             5,015,689

  Cost of shares redeemed                                                                  (37,105,617)          (80,030,736)

                                                                                       ________________       _______________

    Increase (Decrease) in Net Assets from Beneficial Interest Transactions                 (3,649,954)           (6,493,003)

                                                                                       ________________       _______________

       Total Increase (Decrease) in Net Assets                                              (1,198,339)             (675,856)

NET ASSETS:

  Beginning of Period                                                                      134,692,349           135,368,205

                                                                                       ________________       _______________

  End of Period                                                                           $133,494,010          $134,692,349

                                                                                       ________________       _______________

                                                                                           Shares                Shares

                                                                                       ________________       _______________

CAPITAL SHARE TRANSACTIONS:

  Shares sold                                                                                2,032,585             4,754,904

  Shares issued for dividends reinvested                                                       143,675               347,234

  Shares redeemed                                                                           (2,413,750)           (5,559,241)

                                                                                       ________________       _______________

    Net Increase (Decrease) in Shares Outstanding                                             (237,490)             (457,103)

                                                                                       ================       ===============


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS

  Contained  below  is  per  share  operating  performance  data  for a share of
Beneficial Interest outstanding, total  investment return, ratios to average net
assets  and other supplemental data for each period indicated. This  information
has been derived from the Fund's financial statements.


                                                Six Months Ended

                                                 June 30, 1998                        Year Ended December 31,

                                                                     ________________________________________________________

PER SHARE DATA:                                   (Unaudited)         1997         1996        1995         1994        1993

                                                  __________         ______       ______      ______       ______      ______
<S>                                                 <C>              <C>          <C>         <C>          <C>         <C>
   Net asset value, beginning of period             $15.30           $14.61       $15.51      $13.26       $15.68      $14.37

                                                    ______           ______       ______      ______       ______      ______

   Investment Operations:

   Investment income--net                              .41              .93          .98         .96         1.01        1.03

   Net realized and unrealized gain (loss)
       on investments                                  .28              .69         (.89)       2.25        (2.42)       1.31

                                                    ______           ______       ______      ______       ______      ______

   Total from Investment Operations                    .69             1.62          .09        3.21        (1.41)       2.34

                                                    ______           ______       ______      ______       ______      ______

   Distributions:

   Dividends from investment income--net             (.41)             (.93)        (.99)       (.96)       (1.01)      (1.03)

                                                   ______            ______       ______      ______       ______      ______

   Net asset value, end of period                  $15.58            $15.30       $14.61      $15.51       $13.26      $15.68

                                                   ======            ______       ______      ______       ______      ______


TOTAL INVESTMENT RETURN                              9.24%(1)         11.69%         .87%      24.91%       (9.18%)     16.59%

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets            .80%(1)           .80%         .80%        .87%         .98%        .78%

   Ratio of net investment income
       to average net assets                         5.39%(1)          6.48%        6.74%       6.69%        7.08%       6.65%

   Decrease reflected in above expense ratios
       due to undertakings by the Manager             .22%(1)           .24%         .19%        .05%          --         .09%

   Portfolio Turnover Rate                         522.19%(2)        905.99%      765.13%     634.38%    1,213.04%     420.68%

   Net Assets, end of period (000's Omitted)      $133,494          $134,692     $135,368    $146,445     $123,403    $215,157
- -----------------------------

(1)  Annualized.

(2)  Not annualized.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

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  ("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  ("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.

  Effective  May  15,  1998,  the  Fund changed its name from "Dreyfus 100% U.S.
Treasury Long Term Fund" to "Dreyfus U.S. Treasury Long Term Fund".

  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 the custodian agreement, the
Fund  receives  net  earnings  credits  based on available cash balances left on
deposit.

  (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. 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  Internal  Revenue  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 $14,679,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized subsequent to December 31, 1997. If not
applied,  $10,632,000  of  the  carryover  expires in fiscal 2002 and $4,047,000
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  (" 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 borrowings. During the period ended June
30, 1998, the Fund did not borrow under the Facility.

DREYFUS U.S. TREASURY LONG TERM FUND
- -----------------------------------------------------------------------------

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,  1998 through June 30, 1998 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 $149,467 during the period ended June 30, 1998.

  (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,  1998,  the  Fund  was charged $138,610 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,  1998,  the  Fund  was charged $37,636 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, 1998, the Fund was
charged $7,974 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 fee 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 of investment securities,
excluding  short-term  securities and financial futures, during the period ended
June 30, 1998, amounted to $699,190,079 and $704,941,983, respectively.

  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, 1998, are set
forth in the Statement of Financial Futures.

  (B)  At  June 30, 1998, accumulated net unrealized appreciation on investments
and  financial futures was $1,873,357, consisting of $2,004,965 gross unrealized
appreciation and $131,608 gross unrealized depreciation.

  At  June 30, 1998, 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).


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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










Printed in U.S.A.                                              073SA986

U.S. Treasury

Long Term Fund

Semi-Annual

Report

June 30, 1998



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