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196 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. m. (*KU 91420); 3.4 mi. N La Cruz road (on hwy. 15) (LACM 7071); 10 mi. E La Cruz (LACM 7072); 10.3 mi. N La Cruz road (on hwy. 15) (LACM 7070); Matatin, 170 m. < e KU 73620-21); 7.3 km. SW Matatan, 155 m, ("KU 78916); 5 mi. N Mazatlan (CSCLB 2960); 5-10 mi. N Mazatlan (LACM 8658-59); 13.2 mi. N Mazatlan (UAZ 4555); 15 mi. N Mazatlan (CSCLB 1915); 15.7 mi. N Mazatlan (LACM 7066); 16.1 mi. N Mazatlan (UAZ 13651); 16.5 mi. N Mazatlan (LACM 7077); 16.6 mi. N Mazatlan (LACM 7081); 19.2 mi. N Mazatlan (CSCLB 1923); 23.1 mi. N Mazatlan (LACM 7078); 32.6 mi. N Mazatlan (LACM 7073); 33 mi. N Mazatlan (LACM 7065); 58 km. N Mazatlan (• KU 73623); 45.2 mi. N Mazatlan (CSCLB 1924); 52.7 mi. N Mazatlan (CSCLB 1926); 72.5 mi. N Mazatlan (CSCLB 1917); 26 km. NW Mazatlan ("KU 86609); 62.3 mi. NW Mazatlan (UAZ 4554): 2.9 mi. S Rancho Huanacastle (LACM 7059); 5,8 mi. S Rancho Huanacastle (LACM 7060); 3.2 mi. N Rosario (CSCLB 1922); San Ignacio (LACM 7074); Teacapan (LACM 7084); 10 km. NW Teacapan ('KU 93498-99); 10 km. NNW Teacapan
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 197 temporals respectively (in order as listed in specimens examined). Each specimen has 8-8 supralabials, 9-9 infralabials, 2-2 preoculars, 2-2 postoculars, supralabials four and five entering the eye, and the posterior pair of chin shields separated medially by a series of small scales. Smith (1943a:467) reported that the anterior nasal is separated from the second supralabial in all (10) of the specimens (from Guanajuato, Michoacan, Puebla, and Veracruz) that he examined. Davis and Smith (1953:137) found the same condition in three snakes from Morelos. The anterior nasal is in contact with the second supralabial on every specimen from Sinaloa. The contact of the anterior nasal and the second supralabial is reported to be characteristic of S. grahamiae by Smith (1939b: 233), but is considered to be of little, if any, taxonomic importance by Charles M. Bogert (personal communication). In the specimens from Sinaloa, the dorsolateral dark stripes terminate on the nape just posterior to the parietal and temporal regions. This characteristic distinguishes S. bairdi from S. lineata, in which the dorsolateral dark stripes diverge on the neck and pass through the temporal region to the eye. The Sinaloan specimens of bairdi also have a dark lateral stripe on the third scale row. The right maxilla of one specimen (KU 78918) has nine teeth anterior to the diastema that separates them from larger teeth at the posterior end of the jaw. In contrast, S. grahamiae lacks a dark lateral stripe on the third scale row and usually has ten maxillary teeth anterior to the fangs (Smith and Taylor, 1945:122). However, it is of interest to note that the anterior nasal and the second supralabial are separated in the southern part of the range of bairdi (away from the range of grahamiae) and the nasal and supralabial are in contact in the northern part of the range (close to the range of grahamiae). Bogert and Oliver (1945:403) suggested that S. bairdi and S. lineata might intergrade in Hidalgo and Distrito Federal. Davis and Dixon (1957a:21-22) reported a specimen from Michoacan that was intermediate between bairdi and lineata and suggested that they are probably subspecies of a single species. However, Davis and Dixon regarded them as distinct species pending the availability of more material. Duellman (1961:108) found only one specimen that resembled lineata among 89 specimens from Michoacan. Our specimens are typical of bairdi in most characters but the overlap in some characters previously discussed suggests 13—3685
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PLATE 1 Fie. 1. Tropical Thorn Wood
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PLATE 3 Fit;. 1. Tropical Si-iniari
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PLATE 8 Fit:. 1. Subtropical Dry Fo
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