Exhibit 23.3
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
  As independent public accountants, we hereby consent to the incorporation of
our report included in this Form 10-K into the Company's previously filed
Registration Statements on Form S-3 (Nos. 333-28737, 333-28737-02, 333-28737-
04, 333-46775, 333-46775-01, and 333-46775-02) and on Form S-8 (Nos. 33-52148,
33-62894, 333-19131, 333-27697, 333-27699, 333-27701 and 333-27703).
 
                                                        /s/ Arthur Andersen LLP
 
San Antonio, Texas
March 29, 1999