and Michoacan. A taxonomic revision of the four species in this area is presented recognizing two subspecies of S. cunicularius, three of S. floridanus, two of S. graysoni, and two of 5. audubonii. Two subspecies of S. floridanus (S. /. restrictus and S. /. subcinctus) are relegated to the synonomy of S. /. orizabae. Two subspecies are described as new, one each of 5. graysoni and S. floridanus. The karyotype of S. graysoni is presented and figured. External and cranial measurements for all species and subspecies are presented. OFFICIAL PUBLICATION DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Smithsonian Year. SERIES COVER DESIGN: The coral Montastrea cavernosa (Linnaeus). Library of Congress cataloging in Publication Data Diersing, Victor E Distribution and systematics of the rabbits (Sylvilagus) of west-central Mexico.