MEXICAN SNAKES AND CROCODILIANS SMITH 433 



Five other specimens in the Museum are like the above : No. 1282 (2) r 

 Matamoros, Tamaulipas ; No. 17531, Corralitos, Chihuahua ; No. 56132, 

 Chihuahua ; and No. 60044, Tlahualilo, Durango. These five have two 

 to five accessory scales ; one has no azygous scale ; one has two loreals, 

 the others one. These specimens and those reported by Dunkle and 

 Smith (1937, pp. 9-10) outline very well the geographic distribution 

 of kennerlyi, which occurs in southern New 7 Mexico, western Texas, 

 and northern Mexico east of western Chihuahua to the exclusion of 

 other forms. 



How T ever, a specimen from "Sonora" (collected by Jenkins and 

 Evermann, No. 61954) has 3^i loreals and 16 azygous scales, and 

 accordingly cannot be considered kennerlyi. I have examined several 

 similar Arizona specimens. I cannot observe readily definable dif- 

 ferences between these and typical nasicus, to which I refer them. 

 The area occupied by them in Sonora and Arizona no doubt borders 

 the western edge of the range of kennerlyi, and it is conceivable that 

 the southwestern and northern ranges of nasicus are continuous 

 through northern New Mexico. The southwestern population is most 

 curiously situated, however, and may perhaps have characters, not 

 now defined, that will separate it from other n. nasicus. 



*HYPSIGLENA OCHRORHYNCHUS OCHRORHYNCHUS Cope 



The Museum has a single specimen, No. 14287, from "Chihuahua." 

 It is a female with 21-21-15 scale rows, 168 ventrals, 46 caudals, 8-8 

 supralabials, 10-10 infralabials, 1-1 preoculars (no subpreocular), 2-2 

 postoculars, 1-2-3 temporals. The postocular stripe is partially inter- 

 rupted near the angle of the jaws. 



*HYPSIGLENA OCHRORHYNCHUS JANII (Duges) 



Four specimens in the Museum are from "Guanajuato" (Nos. 9889, 

 11369), Tupiitaro, Michoacan (No. 46513), 40 and Rio Verde, San Luis 

 Potosi (No. 46444). These cannot be referred to torquatus or affinis, 

 since they show no vestige of a light nuchal collar. They differ from 

 typical ochrorhynchus at least in the large size of the nuchal spot, 

 which covers 9 to 10 scale lengths, while northern specimens of the 

 species have a considerably shorter nuchal spot or spots (2 to 6 scale 

 lengths) . 



*HYPSIGLENA TORQUATA (Gunther) 



Two specimens 41 in the Museum are from Colima (No. 31385) and 

 San Bias, Nayarit (No. 51479) . The nuchal light collar is well defined 

 in both. 



40 Taylor, 1930b, p. 373. 



" Taylor, 1939b, pp. 372-373. 



