Vol. 84, No. 40, pp. 327-334 29 February 1972 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A SUBSPECIES OF AGKISTRODON BILINEATUS (SERPENTES: CROTALIDAE) ON THE YUCATAN PENINSULA, MEXICO /<^,TriibO]v}> By Howabd K. Gloyd Department of Biological Sciences, FEB 2 9 1972 University of Arizona, Tucson, Arizona 85721^->s.^t£Sf(f\,\it'0^ Study of the snake species Agkistrodon bilineatus has proved to be unexpectedly difficult because of the nature of available material. Although I have examined some 130 speci-mens, 39 percent of them are without definite localities or are young born in zoos with no indication of provenance. Many to which localities are attached are mangled or injured in such ways as to make accurate scale counts or measurements im-possible. No single locaHty is represented by a series suffi-ciently large for an indication of local variation, except possibly Colima, and some specimens listed from there are questionable. First described by Giinther (1863) from the Pacific Coast of Guatemala, Agkistrodon bilineatus was recorded from Yucatan by this same author (1895), and subsequently from there by Gaige (1936), Schmidt and Andrews (1936), and Duellman (1965a). Through the courtesy of Dr. William E. Duellman and of Dr. T. Paul Maslin I have had the privilege of studying some well-preserved specimens recently obtained in Yucatan and Campeche, and have been led to the conclusion that this peninsular population represents a subspecies that should be recognized by name. I therefore propose that it be known as: Agkistrodon bilineatus russeolus new subspecies Yucatecan Cantil Ancistrodon bilineatus, Giinther, 1895, p. 186 (part). — ^Velasco, 1895, p. 37.— Boulenger, 1896, p. 521-522 (part). 40— Proc. Biol. Soc. Wash., Vol. 84, 1971 (327)
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