MEXICAN SNAKES AND GROCODILIiANS SMITH 493 



and postoculars 3-3; loreals 2-2; preocular in contact with frontal; 

 spots on body 20, on tail 13. 



Variations. — Twelve specimens of b. semirutus from Colima, Mich- 

 oacan, and Guerrero have a total of 358 to 376 ventrals and caudals 

 (358, 1; 360, 2; 362, 1; 365, 1; 370, 2; 371, 1; 373, 1; 374, 1; 375, 1; 

 376, 1) . Sixteen specimens of b. biscutatus from Morelos, Oaxaca, and 

 Chiapas have a total count of 341 to 359 (341, 1 ; 343, 1 ; 344, 1 ; 345, 3; 

 346, 1 ; 347, 1 ; 349, 2 ; 351, 1 ; 354, 1 ; 355, 1 ; 359, 2) . An interlacing of 

 the ranges of the two races in Guerrero and Morelos is indicated by 

 the Morelos specimen (Taylor, 1940, p. 477). 



Remarks. — The type was found under an exfoliated slab on the 

 side of a large granite boulder. 



♦TRIMORPHODON COLLARIS Cope" 



A single specimen, the type, is in the Museum; it is labeled 

 "Orizaba," Veracruz; it is actually from Tuxpango, near Orizaba 

 (Sumichrast). 



TRIMORPHODON FASCIOLATA Smith 



Trimorphodon fasciolata Smith, Proc. U. S. Nat. Mus., vol. 91, pp. 160-162, 1941. 



A single specimen, the type (No. 110400), from Zararacua, 6 miles 

 southeast of Uruapan, Michoacan, is in the collection. It was found 

 under the bark of a dead tree. 



The Museum has no other specimens of the species. 



TRIMORPHODON FORBESI Smith 



Trimorphodon forbesi Smith, Proc. U. S. Nat. Mus., vol. 91, pp. 163-165, 1941. 



A single specimen is from San Diego, near Tehuacan, Puebla (No. 

 110402) ; it is the type. 

 The Museum has no others specimens of the species. 



♦TRIMORPHODON LAMBDA Cope 



Two Mexican specimens are in the Museum, from Guaymas, Sonora 

 (No. 13487, type), 1 and "Sonora" (No. 56321). 



♦TRIMORPHODON PAUCIMACULATUS Taylor 



A single specimen in the Museum is from San Bias, Nayarit 

 (No. 46618). 2 



89 Cope, 1S76, p. 131 ; Smith, 1041t, pp. 165-166. 



1 Cope, 1886, pp. 286-287 ; Taylor, 1989b, p. 360, pi. 35, fig. 4. 



8 Smith, 1941t, p. 155. 



