01. CEMOPHORA. 213 



d. Hjrr. 9 (V. 204 ; C. 40, San Diego, California. Prof. C. Eigenmann 

 11 last .Jiviiled). [C.l 



e. 2 (V. 104 ; C. 42). California. 



Var. iMMBffnf, Garm. 1. c. p. 74. 



Yrntrals 178, subcaudals 37 entire and 14 pairs. 



Coahuila, Mexico. 



2. Rhinochilus thominoti. 



Khinocheilus tbomiuotii, Bocourt. Le Naturaliste, (2) i. 1887, p. 45, 

 tigs. 



Portion of rostral visible from above about half as long as its 

 distance from the frontal ; suture between the internasals shorter 

 than that between the praefrontals : frontal a little shorter than its 

 distance from the end of the snout ; loreal longer than deep ; one 

 prae- and two postoculars; temporals 2+3; eight upper labials, 

 fourth and fifth entering the eye ; four lower labials in contact with 

 the anterior chin-shields ; posterior chin-shields nearly as large as the 

 anterior and in contact with each other in front. Scales in 19 rows. 

 Ventrals 181 ; anal entire ; subcaudals 82, all single. Reddish yellow 

 above ; upper surface of head and a broad nuchal band brown ; lower 

 parts yellow. 



Total length 280 millim. ; tail 67. 



Venezuela. 



3. Rhinochilus antonii. 



Rhinocheilus antonii, Duges, Proc. Am. Phil. Soc. xxiii. 1886, p. 290, fig., 

 and Le Naturaliste, (2) i. 1887, p. 46, atid La Naturalesa, (2) i. 1888, 

 p. 66, pi. vii. ; Bocourt, Miss. Sc. Mex., Kept. pi. xlv. fig. 4 (1888). 



Head-shields as in R. Itcontii. Scales in 17 rows. Ventrals 

 200; anal entire; subcaudals 41, last three divided. Black above, 

 with narrow yellow (red ?) cross bands ; lips yellow ; belly yellow, 

 checkered with black. 



Total length 310 raillim. ; tail 35. 



San Bias, near Mazatlan, Mexico. 



91. CEMOPHORA. 



Heterodon, part., Schleg. Phys. Serp. ii. p. 96 (1837). 



Sinjotes, part., Dim. 9 Sibr. Erp. Gin. vii. p. 624 (1854); Gimth. 

 Cut. Col. Sn. p. 23 (1858). 



Cemophora, Cope, Proc. Ac. Philad. 1860, p. 244; Jan, Arch. 'And. 

 Anat. Phys. ii. 1863, p. 230; Bocourt, Miss. Sc. Meu:, Kept. p. 567 

 (1883) ; Cope, Proc. U.S. Nat. Mas. xiv. 1802, p. 602. 



Stasiotes, Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 76. 



Maxillary teeth 8 to 1 1, posterior much longer than anterior ; 

 mandibular teeth subequal. Head not distinct from nock, \\itli 

 pointed, strongly projecting snout ; eye small, pupil round ; rostral 

 and frontal large; nostril in a single or divided nasal. Body- 

 elongate, cylindrical ; scales smooth, witli apical pits, in 19 rows. 

 Tail rather short ; subcaudals in two rows. 



North America. 



