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species avoids scrub forest; this may explain its absence in the Balsas-Tepalcatepec Valley. ~Sonora michoacanensis michoacanensis~ (Duges) _Contia michoacanensis_ Duges, _in_ Cope, Proc. Amer. Philos. Soc., 22:178, 1885.--Michoacan. Type locality restricted to Apatzingan, Michoacan, Mexico, by Smith and Taylor (1950a:335). _Sonora michoacanensis michoacanensis_, Stickel, Proc. Biol. Soc. Washington, 56:116, October 19, 1943. Apatzingan (3); Coalcoman (3); 12 km. S of Tzitzio. These specimens, together with all known specimens from the Sierra del Sur in Guerrero (KU 23790-1, MVZ 45123) and the upper Balsas Basin in Puebla (UIMNH 41688), are referable to _S. m. michoacanensis_. The dorsal pattern consists of a highly variable number of cross-bands of red, white, and black. In the specimens from Michoacan there are as many as 17 red cross-bands on the body. One specimen from Apatzingan (CNHM 37141) has just behind the head a white band, bordered on either side by a narrow black band; posteriorly the body is uniform red. Two specimens from Coalcoman (UMMZ 109905-6) have respectively 11 and 13 red cross-bands and 20 and 17 white cross-bands, and the posterior part of the body is devoid of red color. Other specimens from these localities have red, black, and white cross-bands throughout the length of the body. _Sonora michoacanensis michoacanensis_ is distinguished from _S. michoacanensis mutabilis_ by the presence of cross-bands on the tail in the latter (Stickel, 1943:116). One specimen from Coalcoman (UMMZ 109904) has one narrow band on the tail; all others from Michoacan have uniformly red tails. Apparently _Sonora michoacanensis michoacanensis_ ranges in semi-arid and arid habitats from the upper Balsas Basin in Puebla westward to the lower slopes of the Sierra de Coalcoman, whereas _S. m. mutabilis_ lives in foothills of the Sierra Madre Occidental from southern Jalisco to Nayarit. Zweifel (1959b:6) presented evidence to show that specimens of _S. m. mutabilis_ supposedly from "Distrito Federal" probably bear erroneous locality data. ~Tantilla bocourti~ (Guenther) _Homalocranium bocourti_ Guenther, Biologia Centrali-Americana, Reptilia, p. 149, 1895.--Guanajuato, Guanajuato, Mexico. _Tantilla bocourti_, Cope, Amer. Nat., 30:1021, December, 1896. Carapan; Patzcuaro (2); between Zitacuaro and Rio Tuxpan (11). This smal
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