MEXICAN SNAKES AND CROCODILIANS — SMITH 



477 



The Museum has two others, from the vicinity of Tehuantepec 

 (Tapana and Barrios, Nos. 26500, 30530). 



TANTILLA STRIATA Dunn 



Four specimens were secured ; one is a topotype, from Mixtequilla, 

 Oaxaca (No. 110375) ; another is from La Concepcion, about 40 km. 

 west of Tehuantepec (HMS No. 18518) ; a third is from Cajon de 

 Piedra, west of Salina Cruz, Oaxaca (No. 110376) ; the last is from 

 Las Pilas, 20 km. southwest of Tehuantepec, Oaxaca (No. 110585). 



The upper and lower labials are 7-7, the preoculars 1-1, postoculars 

 2-2 in all ; the mental is in contact with the anterior chinshields. 



The Museum has no others of the species. 



Ventrals and candals, respectively, in Nu 110375 (9), 160, 34; 

 No. 110376 ( $ ) , 157, 42 ; No. 18518 ( $ ) , 163, 37. 



TANTILLA WILCOXI RUBRICATA Smith 



Tantilla wilcoxi rubricata Smith, Zoologica, vol. 27, pp. 40-41, 1942. 



The two types (Nos. 110398-9) were found under stones in a semi- 

 arid region, during a period of drizzling showers, 15 miles southeast 

 of Galeana, Nuevo Leon. 



The Museum has no others of this race. 



Of considerable interest are five specimens (77241 [3] -77242 [2]) 

 in the Museum of Zoology, University of Michigan, from Charcas, 

 San Luis Potosi. All have 7-7 supralabials and the mental separated 

 from the chin shields, but in other characters of scutellation there 

 is considerable variation. The preocular is fused with the prefrontal 

 on one side in one (1-1 in others) ; the postoculars are 2-2 except in 

 one which has the lower scale fused with the 4 supralabials ; the pre- 

 frontal is in contact with the labials in three; there are 4-4 infra- 

 labials in one (several scales fused) 6-7 in one, and 7-7 in three; and 

 the secondary temporal is elongate on one side in one, on both sides 

 in two, but divided on both sides of two and on one side of one. The 

 scale rows are reduced to 13 posteriorly in one specimen. Variation 

 in ventral and caudal count is given in table 37. 



Table 37. — Variation in Tantilla wilcoxi rubricata 



