Occasional Papers of the Museum of Zoology 5 



s=. Snout yellowish with transverse black spots; a 

 single, anterior temporal, or, if two, the upper 

 much the smaller; caudals not more than 49. 



L. micropholis Cope. 

 (Panama to Colombia and Ecuador.) 

 r^ Red scales not tipped with black. 



t'. Whitish annuli usually more than 30; snout 

 black. 



u'. Ventrals more than 200; black rings 

 often meeting across the red dorsally. 



L. muUicincla (Yarrow). 

 (California.) 



u*. Ventrals less than 200; black rings not 

 meeting across the red dorsally. 



L. ruthveni Blanchard. 

 (Southern Mexico.) 



t^. Whitish annuli less than 30. 



v'. Dorsal red areas usually continuous 

 across the belly; snout whitish, 

 specked with black. 



W. Ventrals usually more than 210 

 (199 to 231). 



L. triangulum nelsoni Blanchard. 

 (Western Mexico.) 



w^ Ventrals usually less than 200 

 (180 to 212). 



L. triangulum amatira (Cope). 

 (Lower Mississippi Valley.) 



v^. Spaces on belly between the yellow 

 rings filled with black; snout totally 

 black, or only very shghtly lightened 

 on the top or sides. 



X'. Yellowish rings 19 to 25: black 

 spaces on belly usually longer 

 than the intervening yellow 

 ones. 



L. triangulum annulata 



(Kennicott). 



(Plateau region of southern 



Mexico north to extreme 



southern Texas.) 



