AMERICAN PHYSICIANS SERVICE GROUP INC
SC 13D/A, 1999-05-19
MANAGEMENT SERVICES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                 SCHEDULE 13D/A
                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*


                          Prime Medical Services, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

               Shares of Common Stock, par value $0.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   74156C 10 0
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                William H. Hayes
                          1301 Capital of Texas Highway
                                   Suite C-300
                               Austin, Texas 78746
                                 (512) 328-0888
- --------------------------------------------------------------------------------
 (Name, Address and Telephone Number of Person Authorized to Receive Notices and
      Communications)

                                  April 6, 1999
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
         to report the  acquisition  which is the subject of this  Schedule 13D,
         and is filing this schedule because of ss.ss.240.13d-1(e), 240.13d-1(f)
         or 240.13d-1(g), check the following box .

         Note:  Schedules filed in paper format shall include a signed  original
         and five copies of the schedule, including all exhibits. 
         See ss.240.13d-7  for other parties to whom copies are to be sent.

         *The  reminder  of this cover page shall be filled out for a  reporting
         person's  initial filing on this form with respect to the subject class
         of securities,  and for any subsequent amendment containing information
         which would alter disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
         be deemed to be "filed" for the purpose of Section 18 of the Securities
         Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
         that section of the Act but shall be subject to all other provisions of
         the Act (however, see the Notes).


<PAGE>



         Potential  persons who are to respond to the  collection of information
         contained  in this form are not  required  to  respond  unless the form
         displays a currently valid OMB control number.






SEC 1746 (2-98)

                                       2
<PAGE>


CUSIP No.         74156C  10  0
- --------------------------------------------------------------------------------

         1.       Names of Reporting Persons.
                  I.R.S. Identification Nos. of above persons (entities only).

                  American Physicians Service Group, Inc.
                  Employer Identification No. 75-1458323
- --------------------------------------------------------------------------------

         2.       Check the Appropriate Box if a Member of a Group 
                  (See Instructions)

                  (a)

                  (b)      X
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

         3.       SEC Use Only
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

         4.       Source of Funds (See Instructions)  WC
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

         5.       Check if Disclosure of Legal Proceedings Is Required Pursuant
                  to Items 2(d) or 2(e)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

         6.       Citizenship or Place of Organization         Texas
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
- ------------------- ------------------------------------------------------------
Number of Shares
Bene-ficially       7.     Sole Voting Power     2,464,803
Owned by Each
Reporting Person
With
- ------------------- ------------------------------------------------------------
- ------------------- ------------------------------------------------------------

                    8.     Shared Voting Power   
- ------------------- ------------------------------------------------------------
- ------------------- ------------------------------------------------------------

                    9.     Sole Dispositive Power      2,464,803
- ------------------- ------------------------------------------------------------
- ------------------- ------------------------------------------------------------

                    10.    Shared Dispositive Power    
- ------------------- ------------------------------------------------------------
- --------------------------------------------------------------------------------

         11.      Aggregate Amount Beneficially Owned by Each Reporting Person
                    2,464,803
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

         12.      Check if the Aggregate Amount in Row (11) Excludes Certain 
                  Shares (See Instructions)     
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

         13.      Percent of Class Represented by Amount in Row (11)     14.3%
- --------------------------------------------------------------------------------

         14.      Type of Reporting Person (See Instructions)

                  CO





                                       3
<PAGE>



                         AMENDMENT No. 2 to SCHEDULE 13D


         This  Amendment  No. 2 to  Schedule  13D is being  filed on  behalf  of
American  Physicians  Service  Group,  Inc., a Texas  corporation  ("APS") as an
amendment to the initial  statement on Schedule  13D,  relating to shares of the
common  stock,  par value  $0.01 per share  ("Common  Stock")  of Prime  Medical
Services,  Inc.  (the  "Company")  as filed  with the  Securities  and  Exchange
Commission  (the  "Commission")  on October 20, 1989, as amended by Schedule 13D
filed with the Commission on July 29, 1993. In accordance  with Rule 13d-2(e) of
Regulation  13D the entire text of the  Schedule  13D, as amended,  is set forth
below:


Item 1.  Security and Issuer


         Item 1 is hereby amended in its entirety as follows:


         This statement relates to the common stock, $.01 par value (the "Common
Stock"),  of  Prime  Medical  Services,   Inc.,  a  Delaware   corporation  (the
"Company").  The principal  executive offices of the Company are 1301 Capital of
Texas Highway, Austin, Texas 78746.


Item 2.  Identity and Background


         (a)......This  statement is filed by American Physicians Service Group,
inc., a Texas corporation ("APS").


         (b)......The address of the principal  business and the  principal  
office of APS is 1301 Capital of Texas Highway, Austin, Texas 78746.


         (c)......APS,  through its subsidiaries,  primarily  provides financial
services that include management of a medical malpractice  insurance company and
brokerage and  investment  services to  individuals  and  institutions  and also
provides  information  services that include computer systems and software sales
to medical  clinics and  medical  schools and  publication  of  Spanish-language
yellow page directories of Texas businesses for major markets in Mexico.


         APS,  through  its  wholly-owned  subsidiaries,   provides  non-medical
management   services   to   lithotripsy,   diagnostic   imaging   and   cardiac
rehabilitation  centers.  (See amended Exhibit A for  information  regarding the
officers and directors of APS).


         (d)      Neither  APS  nor any of the  persons  listed  on  Exhibit  A 
has  been  convicted  in a criminal proceeding (excluding traffic violations or 
similar misdemeanors) during the last five years.


         (e)  During the last five  years,  neither  APS nor any of the
persons listed on Exhibit A has been a party to a civil proceeding of a judicial
or  administrative  body  of  competent  jurisdiction  and as a  result  of such
proceeding  was or is subject to a  judgment,  decree or final  order  enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state securities laws or finding any violation with respect to such laws.


         (f)  Each person listed on Exhibit A is a citizen of the United States.


Item 3.  Source and Amount of Funds or Other Consideration


         APS purchased  3,539,503  shares (the  "Shares") of the Common Stock of
the  Company  in  a  private   transaction   for  an  aggregate  cash  price  of
$4,955,304.20,  or $1.40 per share,  subject to future  adjustments based on the
outcome  of  certain  litigation  described  in  the  Stock  Purchase  Agreement
(hereinafter  defined).  The source of the funds required to purchase the Shares
was  existing  working  capital of APS. See Exhibit A for the source of funds or
other consideration of the officers and directors of APS.


Item 4.  Purpose of Transaction


         Item 4 is hereby amended in its entirety as follows:


         (a)......APS  purchased  the  Shares  pursuant  to that  certain  Stock
Purchase  Agreement  (the "Stock  Purchase  Agreement")  dated as of October 11,
1989, between APS, as buyer, and Texas American Energy  Corporation,  a Delaware
corporation ("TAE"), as seller, with the purpose of acquiring, as an investment,
a significant  ownership position in the Company.  Consistent with such purpose,
APS may, subject to the factors stated in the following  paragraph,  continue to
buy  additional   shares  of  Common  Stock  from  time  to  time  in  brokerage
transactions on the open market,  or in privately  negotiated  transactions,  or
otherwise,  if appropriate  opportunities to do so are available,  on such terms
and at such times as APS considers desirable.


                                       4
<PAGE>

         APS intends to review  continuously  its position in the  Company,  and
may,  depending upon its evaluation of the Company's  business and prospects and
upon future  developments,  determine  to increase or decrease or dispose of its
ownership of Common Stock of the Company. In making any such determination,  APS
also intends to take into consideration other business  opportunities  available
to  it,  developments  with  respect  to  its  own  business,  general  economic
conditions,  stock market conditions, and APS's ability to obtain necessary bank
or other financing on terms satisfactory to APS.


         APS entered  into a Stock  Option  Agreement,  dated June 23, 1992 (the
"First  Agreement"),  with the Alabama  Renal Stone  Institute,  Inc.  ("ARSI").
Pursuant  to the terms of the First  Agreement,  the  assigns of ARSI  exercised
their option on January 27, 1993 to purchase an  aggregate of 237,500  shares of
Common  Stock  of the  Company  from  APS for an  aggregate  exercise  price  of
$296,875, which exercise price was paid by delivery of a certain promissory note
issued by a subsidiary of the Company in the principal  amount of $296,875.  The
stock  certificates  representing  such shares were  transferred from APS to the
assigns of ARSI on July 2, 1993.

         On April 6,  1999,  APS  entered  into an  agreement  with three of its
shareholders,  M.J. Whitman Advisers, Inc. ("Whitman"),  Third Avenue Value Fund
("TAVF"),  and Third  Avenue  Value  Portfolio  of the WRL Series Fund  ("TAP"),
whereby APS will exchange  599,700 shares of Common Stock of the Company held by
APS for a total of  1,199,400  shares of the $0.10 par value common stock of APS
held by  Whitman,  TAVF and TAP.  On the  effective  date of the  exchange,  the
closing  trade  price of the common  stock of APS and the Company as reported by
the National Association of Securities Dealers,  Inc. Automated Quotation System
was $3-1/8 and $7-3/16,  respectively.  The transaction was effected by transfer
on the records of the Depository Trust Company.

         (b)......Not applicable.


         (c)......Not applicable.


         (d)......APS  has, as a result of the purchase of the Shares,  acquired
control of the Company and, as discussed below,  obtained  representation on the
Company's Board of Directors.  In addition,  APS reserves the right, although it
has no current plans, to take any actions which it deems appropriate to maximize
the value of the Common  Stock of the  Company,  including  the various  actions
referred to in the text of Item 4 of Schedule 13D.


         Pursuant  to that  certain  Agreement  (the  "Agreement")  dated  as of
October 11,  1989,  by and among APS, the Company,  TAE, and  Shamrock,  (i) the
Company  approved the  acquisition  of the Shares by APS,  (ii) Paul O. Koether,
David B. Blanchard,  M. Michael Witte, and Lloyd H. Klatzkin resigned as members
of the Board of Directors of the Company  effective as of October 11, 1989,  and
(iii) Jack R. Chandler,  M.D., Jackie C. Majors,  William Searles and Kenneth S.
Shifrin,  all of whom  are  directors  of APS,  were  elected  to the  Board  of
Directors of the Company. In addition, the following  individuals,  each of whom
is an officer or  director  of APS,  were  elected to serve as  officers  of the
Company: Kenneth S. Shifrin as Chairman, Jackie C. Majors as President and Chief
Executive Officer, and William H. Hayes as Chief Financial Officer.


         (e)......Not applicable.


         (f)......Not applicable.


         (g)......Not applicable.


         (h)......Not applicable.


         (i)......Not applicable.


         (j)......Not applicable.


         The foregoing summary of the Stock Purchase Agreement and the Agreement
is  qualified  in its  entirety by the full text of these  agreements  which are
attached hereto as exhibits and incorporated herein by reference.


Item 5.  Interest in Securities of the Issuer


         Item 5 is hereby amended in its entirety as follows:


         (a)......APS  is  the  beneficial   owner  of  2,464,803  shares  of 
Common  Stock,   which   constitutes approximately  14.3% of the  issued  and  
outstanding  shares  of Common  Stock.  See  Exhibit A for  shares of the
Company beneficially owned by the officers and directors of APS.


                                       5
<PAGE>

         (b)......APS  has both the power to vote or direct the vote of, and the
power to dispose of or direct  the  disposition  of, all of the shares of Common
Stock beneficially owned by it. Each of the officers and directors of APS listed
on  Exhibit A has both the power to vote or direct the vote of, and the power to
dispose of or direct  the  disposition  of,  all of the  shares of Common  Stock
beneficially owned.


         (c)......During the past 60 days, APS effected the last  transaction 
described in Paragraph (a) of Item 4 above.


         (d)......Not applicable.


         (e)......Not applicable.


Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
to Securities of the Issuer


         Item 6 is hereby  partially  amended by adding the final two paragraphs
at the end thereof:


         Pursuant  to  that  certain   Standstill   Agreement  (the  "Standstill
Agreement") dated as of October 11, 1989, among APS, TAE, Shamrock,  and Paul O.
Koether,  an individual  residing in New Jersey  ("Koether"),  TAE, Shamrock and
Koether agreed not to acquire any  additional  shares of capital stock of APS or
the  Company and not to attempt  any  takeover of APS or the Company  including,
without  limitation,  soliciting  proxies  for  the  election  of  directors  or
otherwise seeking to control the Board of Directors of APS or the Company, until
after October 1, 1999.


         The foregoing  summary of the Standstill  Agreement is qualified in its
entirety  by the full  text of this  agreement  which is  attached  hereto as an
exhibit and incorporated herein by reference.


         APS has entered into a Stock Option Agreement, dated June 23, 1992 (the
"Second Agreement"),  with the Alabama Renal Stone Institute, Inc. ("ARSI"). The
Agreement provides that ARSI or its assigns may purchase an aggregate of 237,500
shares of Common Stock of the Company from APS for an aggregate  purchase  price
of  $296,875,  which  price  may be paid in cash  or by  delivery  of a  certain
promissory note issued by a subsidiary of the Company in the principal amount of
$296,875  due on January  31,  1994.  The option is  exercisable  by ARSI or its
assigns from November 1, 1992 to April 30, 1995,  unless the Second Agreement is
terminated earlier by its terms. If the option is not previously exercised,  APS
has the right to put the  shares of Common  Stock  subject to the option to ARSI
for the exercise price and consideration described above.


         Certain  officers  and/or  directors  of APS hold  options to  purchase
Common Stock of the Company, as summarized on Exhibit A.

         On April 6,  1999,  APS  entered  into an  agreement  with three of its
shareholders,  M.J. Whitman Advisers, Inc. ("Whitman"),  Third Avenue Value Fund
("TAVF"),  and Third  Avenue  Value  Portfolio  of the WRL Series Fund  ("TAP"),
whereby APS will exchange  599,700 shares of Common Stock of the Company held by
APS for a total of  1,199,400  shares of the $0.10 par value common stock of APS
held by  Whitman,  TAVF and TAP.  On the  effective  date of the  exchange,  the
closing  trade  price of the common  stock of APS and the Company as reported by
the National Association of Securities Dealers,  Inc. Automated Quotation System
was $3-1/8 and $7-3/16,  respectively.  The transaction was effected by transfer
on the records of the Depository Trust Company.


                                       6
<PAGE>




Item 7.  Material to Be Filed as Exhibits


         This Item hereby is supplemented by amending  Exhibit A in its entirety
and adding Exhibit F thereto:


Exhibit           A  -  Description  of  Executive  Officers  and  Directors  of
                  American Physicians Service Group, Inc., (filed herewith).


Exhibit B -       Stock  Purchase  Agreement  dated October 11, 1989, by and
                  between  American  Physicians  Service Group, Inc., as Buyer, 
                  and Texas American Energy Corporation, as Seller.*


Exhibit C -       Agreement  dated as of October 11, 1989, by and among American
                  Physicians Service Group,  Inc., Prime Medical Services, Inc.,
                  Texas American Energy Corporation, and Shamrock Associates.*


Exhibit D -       Standstill  Agreement  dated as of October 11, 1989,  among  
                  American  Physicians  Service Group, Inc., Texas American 
                  Energy Corporation, Shamrock Associates, and Paul O. Koether.*


Exhibit E -       Stock Option Agreement, dated June 23, 1992, between ARSI and 
                  APS.  +


Exhibit F -       Agreement, dated April 6, 1999 between APS, Whitman, TAVF and 
                  TAP.


* Filed as an exhibit to the Current Report on Form 8-K dated  October 20, 1989,
  of American Physicians Service Group, Inc., Commission File No. 0-11453, and 
  incorporated herein by reference.


+ Filed as an exhibit to the Schedule 13D dated July 29, 1993, 1989, of American
  Physicians Service Group, Inc., and incorporated herein by reference.





                                       7
<PAGE>


Signature

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

                                   May 18, 1999
- --------------------------------------------------------------------------------
Date

                                   /s/ William H. Hayes
- --------------------------------------------------------------------------------
Signature

                                   William H. Hayes, Sr. VP-Finance
- --------------------------------------------------------------------------------
Name/Title


         The original  statement  shall be signed by each person on whose behalf
the  statement is filed or his  authorized  representative.  If the statement is
signed on behalf of a person by his  authorized  representative  (other  than an
executive  officer or general  partner of this filing  person),  evidence of the
representative's  authority to sign on behalf of such person shall be filed with
the  statement;  provided,  however,  that a power of attorney  for this purpose
which is already on file with the Commission may be  incorporated  by reference.
The name and any title of each person who signs the statement  shall be typed or
printed beneath his signature.


Attention:  Intentional misstatements or omissions of fact constitute Federal 
criminal violations (See 18 U.S.C. 1001)


                                       8

<PAGE>
                                                                


                                    EXHIBIT A

                     AMERICAN PHYSICIANS SERVICE GROUP, INC.

                        EXECUTIVE OFFICERS AND DIRECTORS




                                                                 

Name and Address:                         Position:

Kenneth S. Shifrin                        Chairman of the Board of Directors
1301 S. Capital of Texas Highway          and Chief Executive Officer of
Suite C-300                               American Physicians Service Group, Inc
                                          Austin, Texas 78746


William A. Searles                        Director of American Physicians
179 Hartshorne Road                       Service Group, Inc., and private
Locust, New Jersey 07760                  business consultant.

Robert L. Myer                            Director of American Physicians
3755 Capital of Texas Highway South       Service Group, Inc., and insurance
Suite 148                                 consultant to Americo Life.
Austin, Texas 78704

Duane K. Boyd, Jr.                        Senior Vice President of American
1301 S. Capital of Texas Highway          Physicians Service Group, Inc.
Suite C-300
Austin, Texas 78746

William H. Hayes                          Senior Vice President of American
1301 S. Capital of Texas Highway          Physicians Service Group, Inc.
Suite C-300
Austin, Texas 78746

George S. Conwill                         Vice President of American
1301 S. Capital of Texas Highway          Physicians Service Group, Inc.
Suite C-300
Austin, Texas 78746

Thomas R. Solimine                        Controller of American Physicians 
1301 Capital of Texas Highway             Service Group, Inc.
Suite C-300
Austin, Texas 78746


                                       1
<PAGE>



                           Ownership of Prime Shares:

Name:                    # of Shares:     Amount:           Source of Funds:
                         -----------     --------           -----------------
Kenneth S. Shifrin       115,900          *                 personal earnings

William A. Searles       100              *                 personal earnings

Robert L. Myer           10,000           *                 personal earnings

Duane K. Boyd, Jr.       10,000           *                 personal earnings

William H. Hayes         7,000            *                 personal earnings

George S. Conwill        800              *                 personal earnings


                        Options to Purchase Prime Shares:


Name:                   # of Options:     Option Price:     Expiration Date:
                        ------------      -------------     -----------------
Kenneth S. Shifrin      515,000          $0.25 - $16.125   varies through 2003

William A. Searles      205,000          $0.56 - $13.625   varies through 2003


All directors and executive officers of American Physicians Service Group, Inc.,
are citizens of the United States of America,  and, in the last five years, none
have been convicted in a criminal proceeding or of any violation of any state or
federal securities laws.

*  Shares were acquired periodically over time for varying prices.



                                       2


          
                                     EXHIBIT F
                                  April 6, 1999

VIA TELECOPY (212) 888-6757

M. J. Whitman Advisers, Inc. and
EQSF Advisers, Inc.
767 Third Avenue
New York, NY  10017-2023

Attn:  Ian M. Kirschner, General Counsel and Secretary

         Re:      Exchange of Common Stock of American Physicians Service Group,
                  Inc. ("APS") for Common Stock of Prime  Medical Services, Inc.
                  ("PMSI")

Dear Mr. Kirschner:

         This letter agreement upon your execution  hereof below,  will evidence
the binding agreement between each of M. J. Whitman Advisers,  Inc. ("Whitman"),
Third Avenue Value Fund ("TAVF") and the Third Avenue Value Portfolio of the WRL
Series Fund ("TAP"), and APS for Whitman,  TAVF and TAP to exchange an aggregate
of  1,199,400  shares of the $0.10 par value  common stock of APS owned by TAVF,
TAP and Whitman (being  1,109,900  shares owned by TAVF,  46,000 shares owned by
TAP and 43,500  shares  owned by Whitman)  for a total of 599,700  shares of the
$0.01  par  value  common  stock of PMSI  owned  by APS.  The  exchange  will be
effective as of April 1, 1999.

         APS hereby  represents  and  warrants to each of TAVF,  TAP and Whitman
that the PMSI  shares  to be  received  from APS as  described  above  have been
registered with the SEC under a Form S-3 Registration Statement (No. 333-47621),
which Registration  Statement is currently effective.  A Prospectus with respect
to such Registration Statement has previously been delivered to you.

         If you are in agreement with the foregoing,  please execute this letter
agreement  in the  spaces  provided  below  and fax a  signed  copy  back to the
undersigned at (512)  314-4398,  whereupon this will become a binding  agreement
among us.

         Then,  please  forward  instructions  to your broker(s) to transfer the
TAVF, TAP and Whitman APS shares into certificates issued in the name of APS and
deliver the  certificates  to the  undersigned,  whereupon  we will  forward you
certificates  for the  appropriate  number  of  PMSI  shares.  Unless  otherwise
instructed  by you, we will  allocate  the PMSI

<PAGE>


shares to Whitman,  TAVF and TAP  ratably in  accordance  with their  respective
ownership of the APS shares we are receiving.

         Thank you for your assistance in this regard. If you have any questions
please do not hesitate to call me.

                                       Very truly yours,


                                       /s/: William H. Hayes 
                                       ----------------------             
                                       William H. Hayes, Chief Financial Officer



ACCEPTED AND AGREED TO:

Third Avenue Trust on behalf of
The Third Avenue Value
Fund Series                                    M. J. Whitman Advisers, Inc.

By:      /s/: Martin J. Whitman                By:      /s/: Martin J. Whitman  
         ----------------------                         ----------------------
Printed Name:  Martin J. Whitman               Printed Name: Martin J. Whitman

Title:   Chairman of the Board                 Title:   Chairman of the Board



Third Avenue Value Portfolio
of the  WRL Series Fund

By:      EQSF Advisers, Inc.

By:      /s/: Martin J. Whitman             
         ----------------------
Printed Name: Martin J. Whitman

Title:   Chairman of the Board





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