MFS SERIES TRUST X, 497J, 1996-08-30

MFS SERIES TRUST X
497J, 1996-08-30

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                               MFS SERIES TRUST X
             500 BOYLSTON STREET o BOSTON o MASSACHUSETTS 02116-3741
                                 617 o 954-5000




                                            August 30, 1996




VIA EDGAR
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, NW
Washington, DC  20549

         Re:   MFS Series Trust X (the "Trust") (File No. 33-1657), on behalf
               of MFS Government Mortgage Fund, MFS/Foreign & Colonial
               International Growth Fund, MFS/Foreign & Colonial International
               Growth and Income Fund and MFS/Foreign & Colonial Emerging
               Markets Equity Fund (series of MFS Series Trust X)

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please  accept  this  letter  as  certification  that  the  Supplements  to  the
Prospectus  and  Statement of  Additional  Information  for the  above-mentioned
series  of the  Trust do not  differ  from  those  contained  in  Post-Effective
Amendment No. 16 (the "Amendment") to the Trust's Registration Statement on Form
N-1A. This Amendment was filed electronically on August 29, 1996.

         Please call Karen M. Ray at (617) 954-5801 or (800) 343-2829 ext.
5801 with any questions you may have.

                                            Very truly yours,



                                            JAMES R. BORDEWICK, JR.
                                            James R. Bordewick, Jr.
                                            Assistant Secretary

JRB/bjn