. Bulletin. Science; Natural history; Natural history. HERPETOFAUNA OF THE VIZCAINO PENINSULA, BAJA CALIFORNIA 67. Fig. 18. Hypsiglena torquata from the Sierra Santa Clara. and H. t. texana (Tanner 1944, 1985), should be reevaluated. This, however, will require additional investigation. Salvadora hexalepis.—Salvador a h. klauberi ranges throughout the southern two-thirds of Baja California but has never been reported from the Vizcaino Peninsula (Bogert 1945). One large adult was observed on the morning of 22 June 1990 as it was exiting a burrow at site 1 in the Sierra Santa Clara. Another was
. Bulletin. Science; Natural history; Natural history. HERPETOFAUNA OF THE VIZCAINO PENINSULA, BAJA CALIFORNIA 67. Fig. 18. Hypsiglena torquata from the Sierra Santa Clara. and H. t. texana (Tanner 1944, 1985), should be reevaluated. This, however, will require additional investigation. Salvadora hexalepis.—Salvador a h. klauberi ranges throughout the southern two-thirds of Baja California but has never been reported from the Vizcaino Peninsula (Bogert 1945). One large adult was observed on the morning of 22 June 1990 as it was exiting a burrow at site 1 in the Sierra Santa Clara. Another was observed five km north of Punta Abreojos on 3 July 1991. Both appeared to be typical of all other populations of 5". h. klauberi and represent the westernmost records for this species in central Baja California and the first records of this species from the Vizcaino Peninsula (Bogert 1945). Trimorphodon biscutatus. — Trimorphodon biscutatus ranges throughout Baja California but has never been reported from the Vizcaino Peninsula (Scott and McDairmid 1984). One individual (Fig. 19), from an arroyo between Cerro Cirio and Cerro Cardon at site 1 in the Sierra Santa Clara, was observed. The subspecific status of this snake could not be ascertained due to variation in the "diagnostic" characters used to define the two subspecies currently recognized on the Baja California peninsula (Gehlbach 1971). The two subspecies, T. b. vandenburghi from the northern part of the peninsula and T. b. lyrophanes from the southern portion, possess no unique characteristics, and are differentiated from each other largely on the basis of a divided (7'. b. lyrophanes) or undivided {T. b. vanden- burghi) anal plate (Klauber 1940; Gelbach 1971). However, variation in this feature in both subspecies limits the utility of this character state in identifying individual specimens. Klauber (1940) found that 38 of 39 specimens of T. b. lyrophanes possessed a divided anal plate, although his
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