MEXICAN SNAKES AND CROCODILIANS — SMITH 427 



The Museum has four other Mexican specimens, from Santa Ca- 

 terina, Nuevo Leon (No. 2263), and Chihuahua (Nos. 14223, 14253, 



14284). 



*ELAPHE TRIASPIS (Cope) 



Eight specimens are in the Museum, from Chichen Itza, Yucatan 

 (Nos. 46398, 46574-9), and Chilon, Chiapas (No. 46512). 



ENUHUS SIMICHRASTI Boccurt 



One specimen (No. 109913) was collected at night along a trail near 

 La Esperanza, Chiapas. It is a male, with 185 ventrals and the tail 

 incomplete; infralabials and supralabials 7-7; one postocular, the 

 upper fused with the parietal. 



This is a well-defined species, characterized chiefly bj 7 the shape of 

 the enlarged rostral. The type apparently did not originate west 

 of Tehuantepec, but probably from the east (the only other definite 

 record is from Tonala, Chiapas). 



The Museum has no others of the species. 



ENULIUS UNICOLOR (Fischer) 



One specimen (No. 109912) is from Tres Cruces, Oaxaca. It is a 

 male, with 174 ventrals, 125 caudals, and 7-7 supralabials and infra- 

 labials. 



This species is well differentiated from sumichrasti, which has a 

 distinctly larger rostral, but in that character it is very similar to 

 flavitorques, which also has a smaller rostral. The only difference of 

 any constancy I can find between flavitorques and unicolor is the pres- 

 ence in the former of a light nuchal collar, its absence in the latter. 

 All known Mexican specimens are collarless, while the only collar- 

 less specimen of -flavitorques of which I am aware is one in a series of 

 five from Escuintla, Guatemala (No. 12694). None of this series 

 shows any tendency toward the characters of sumichrasti in form of 

 rostral. Eventually it may be possible to show some average differ- 

 ences between flavitorques and unicolor in scutellation. 



E. murinus Bocourt (and therefore longicaudatus Cope) is based 

 upon "Tehuantepec" specimens, which, according to the figure, corre- 

 spond with the present specimen, and with two secured by Hartweg 

 and Oliver (1940, p. 23). The species may not occur in the lowlands 

 about Tehuantepec, but Dr. Hartweg has it from farther east along the 

 Pacific coast. 



The Museum has no others of the species. 



