872 13. COLUBRIDA 
In Lower California, it has been taken at La Paz and 
Todos Santos, in the Cape Region, and, farther north, on 
Magdalena Island and at Santa Rosalia, Mulege, Ballenas 
Bay, San Fernando, San Quentin, and San Antonio. 
Remarks.—One specimen from Ventana Canyon in the 
Catalina Mountains, Pima County, Arizona, has a well 
developed loreal on each side of the head, but in other 
respects is quite typical. The prefrontal plate may or may 
not reach the labials. The dark dorsal markings may not 
extend down to the gastrosteges, may involve them slightly, 
or may cross them as complete rings. For these reasons I 
am unable to recognize C. ephippicus and C. fasciatus as dis- 
tinct from C. cinctus. 
Habits—Al\most nothing has been recorded regarding 
the habits of this little snake. It is said to burrow in the 
ground and live on the larve of ants. 
198. Chilomeniscus punctatissimus 
Van Denburgh & Slevin 
IstaND BuRROWING SNAKE 
Chilomeniscus punctatissimus VAN DENBURGH & SLEVIN, Proc. Cal. Acad. 
Sci., Ser. 4, Vol. XI, No. 6, 1921, p. 98 (type locality, Isla Partida, 
Espiritu Santo Island, Gulf of California, Mexico). 
Description —Head rather wide, little distinct from 
neck. Snout rather broad, rounded, greatly depressed, point- 
ed in profile. Rostral plate very large, broad, prominent, 
extensively reverted on upper surface of snout, bounded 
behind by two plates on each side of head, these being a 
large plate, corresponding to the internasal and_nasals 
merged, and the first supralabial. Plates on top of head are 
the naso-internasals, a pair of prefrontals, a frontal, supra- 
ocular of each side, and a pair of rather short parietals. Post- 
erior nasal small. No loreal. One preocular. Two post- 
