91. chMOPHORA. 213 
d. Hgr. 2 (V. 204; C.46, San Diego, California. Prof. C. Eigenmann 
11 last divided). [C.]. 
e. 9 (V. 194; C. 42). California. 
Var. tessellatus, Garm. 1. c. p. 74. 
Ventrals 178, subeaudals 37 entire and 14 pairs. 
Coahuila, Mexico. 
2. Rhinochilus thominoti. 
Rhinocheilus thominotii, Bocourt, Le Naturaliste, (2) i. 1887, p. 45, 
figs. 
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 prefrontals: frontal a little shorter than its 
distance from the end of the snout; loreal longer than deep; one 
pre- 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 i an 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, fie., 
and Le Natur raliste, (2) 1. 1887, p. 46, and La Natur aleza, (2 ye 1888, 
p- 66, pl. vil. ; Bocourt, Miss. Se. Mex. , Rept. pl. xlv. fig. 4 (1888). 
Head-shields as in R. lecontii. 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 millim.; tail 35. 
San Blas, near Mazatlan, Mexico. 
91. CEMOPHORA. 
Heterodon, part., Schleg. Phys. Serp. ii. p. 96 (1837). 
Simotes, part., Dum. § Bubr. Erp. Gén. vii. p. 624 (1854); Geinth. 
Cat. Col. Sn. p. 23 (1858). 
Cemophora, Cope, Proc. Ac. Philad. 1860, p. 244; Jan, Arch. Zool. 
Anat. Phys. ii. 1863, p. 230; Bocourt, Miss. Se. Mew., Rept. p. 567 
(1883) ; Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 602. 
Stasiotes, Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 75. 
Maxillary teeth 8 to 11, posterior much longer than anterior ; 
mandibular teeth subequal. Head not distinct from neck, with 
pointed, strongly projecting snout ; eye small, pupil round ; rostral 
and frontal large; nostril in a single or divided nasal. Body 
elongate, cylindrical ; scales smooth, with apical pits, in 19 rows. 
Tail rather short; subcaudals in two rows. 
North America. 
