91. CEMOPHORA. 213 



d. Hgr. $ (V. 204 ; 0. 46, San Diego, California. Prof. C. Eigenmann 

 11 last divided). [0.1. 



e. $ (V. 194 ; 0. 42). California. 



Var. tessellatus, Garm. I. c. p. 74. 



Ventrals 178, subcaudak 37 entire and 14 pairs. 



Coahuila, Mexico. 



2. Khinochilus thominoti. 



Rhinoclieilus thomiuotii, Bocourt, Le Nnturaliste, (2) i. 1887, p. 45, 

 figs. 



Porfcion 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 postooulars; temporals 2+3; eight upper labials, 

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

 the anterior ohin-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, aU single. Eeddish 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. 



Ehinocheilus antonii, Duges, Proe. Am. Phil. &'oc. xxiii. 1886, p. 290, fig. , 

 and Le Naturaliste, (2) i. 1887, p. 46, and La Naturaleza, {2) i. 1888, 

 p. 66, pi. vii. ; Bocourt, Miss. 8c. Mex., Mept. pi. xlv. fig. 4 (1888). 



Head-shields as in B. lecontii. Scales in 17 rows. Ventrals 

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

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

 checkered with black. 



Total length 310 miUim. ; tail 35. 



San Bias, near Mazatlan, Mexico. 



91. CEMOPHORA. 



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



Siniotes, part., Dum. |- Bibr. Erp. Gen. vii. p. 624 (18o4); Gunih. 

 Cat. Col. Sn. p. 23 (1858;. 



Cemophora, Cope, Proc. Ac. Philad. I860, p. 244; Jnn, Arch, look 

 Anat. Phys. ii. 1863, p. 230 ; Bocourt, Miss. Sc. Mex., Rept. p. 567 

 (1883) ; Cope, Proc. U.S. Nat. Mus. x^v. 1892, p. 602. 



Stasiotes, Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 75. 



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

 mandibular teeth subequal. Head not distinct from neck, with 

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

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

 elono-ate, cylindrical ; scales smooth, with apical pits, in 19 rows. 

 Tail°rather short ; subcaudals in two rows. 



North America. 



