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SYNOPSES AND DESCRIPTIONS. 
CHEILORHINA. 
Shape and general appearance that of Elapomorphus, from which it is 
distinguished by the greater number of rows of scales, and by the smooth 
teeth, which gradually increase in size backward. 
CHEILORHINA VILLARSIL. 
(De Fil.) Jan, 1862, Prodr. Icon. Ophid., pp. 55 and 57; Icon. Livr., 48, pl. I, fig. 5. 
Head not distinct from the neck; tail short, thick, blunt; snout prom- 
-inent, broad, rounded. Internasals united with the prefrontals. Frontal 
hexangular, anterior angle produced. Supraciliaries short, broad. Nasals 
entire, united with the anterior labials. Loreal present. Preocular one. 
One postocular. One temporal, in contact with the ocular. Five labials, 
including that united with the nasal, third below eye and orbitals. Infra- 
labials six. Submentals one pair. Scales broad, smooth, in 19 rows. 
Ventrals 213. Anal entire. Subcaudals 15 pairs. 
Crown, labials, and infralabials black to the temporals. With trans- 
verse rings of black, more or less incomplete below, separated by spaces 
of about half their width. The first black ring crosses the neck, and occu- 
pies about seven scales. Two rings surround the tail; all grow narrower 
on the flank. Western Mexico. 
STENORHINA. 
Duméril & Bibron, 1854, Erp. Gin. VIT, 865. 
Moderate, subcylindrical, belly flattened; head little larger than the 
neck, depressed, narrow forward; tail short, stout, conical. Eye small to 
moderate, pupil round. Posterior maxillary teeth a little longer, grooved. 
Internasals and nasals usually fused. Nasals divided. No loreal. Seales 
smooth, in 17 rows. Generally one ante and two post oculars. Anal bifid. 
Subcaudals in two rows. Mexico to Central America. 
Uniform brownish or slightly blotched; 
bases of scales darker Fremenvillet. 
with longitudinal bands of darker, quinquelineatus. 
STENORHINA FREMENVILLEI. 
Duméril & Bibron, 1854, Erp. Gén. VIT, 868. 
Cylindrical, belly broad, tapering slightly to neck and tail; head mod- 
erate, little, if any, larger than the neck, depressed, crown flattened, 
slightly arched in front of the eye; tail short, stout, conical. Eye small, 
