228 COLUBRIDA, 
a-c. g (V. 122; C. 81), 2 San Blas. Hr. A, Forrer [C.]- 
V. 126 ; C. 27), & hgr. (V. 
82; C.27). 
23. Homalocranium gracile. 
Tantilla gracilis, Baird § Gir. Cat. N. Am. Rept. pp. 182, 161 
1853) ; Hallow. Proc. Ac. Philad. 1856, p. 246; Garm. N. Am. 
how p. re vi. fig. 3 (1883); Cope, Proce. U.S. Nat. Mus. xiv. 
, p. 598. 
—— hallowellii, Cope, Proc. Ac. Philad. 1860, E 77. 
Homalocranium gracile, Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 50, 
and Icon. Gén. 165, pl. ii. fig. 1 (1866); Bocourt, Miss. Sc. Mex., 
Rept. p. 579, pl. xxxvi. fig. 5 (1883) ; Giinth. Biol. C.-Am., Rept. 
p. 146 (1895). 
Eye not half as long as the snout, which is much depressed and 
very prominent. Rostral large, a little broader than deep, the 
portion visible from above nearly as long as its distance from the 
frontal; internasals at least half as long as the preefrontals; frontal 
hexagonal, obtuse-angled in front, acute-angled behind, a little 
longer than broad, as long as or longer than its distance from the 
end of the snout, shorter than the parietals ; nostril in a single or 
divided nasal, which is in contact with or narrowly separated from 
the preocular ; one postocular ; temporals 1+ 1, the first sometimes 
narrowly separated from the postocular by the contact of the 
parietal and the fifth labial; six upper labials, third and fourth 
entering the eye ; first lower labial usually separated from its fellow 
by the symphysial ; four lower labials in contact with the anterior 
chin-shields, which are longer than the posterior. Scales in 15 
rows. Ventrals 112-133; anal divided; subcaudals 41-51. Pale 
brown or reddish above, uniform or speckled with dark brown, some- 
times with a dark vertebral line ; upper surface of head darker brown ; 
yellowish or orange below. 
Total length 195 millim, ; tail 44. 
Texas. 
~ 3 dy, et ay ve tes acre Sapte Pa 
c . & (V. 115, 114 uval Co, . Taylor, Tea 
"114, 1165, 114, M9; C48” ; yee 
12; 0.48 Texas, 
47, 51, 49,?) & 9 (V. 
46 
117, 126; ©.?, 48), 
185. OGMIUS. 
Ogmius, Cope, Proc, Amer. Philos. Soc. xi, 1869, p. 162, and Journ. 
‘Ac, Philad. (2) viii. 1876, p. 142. die ray 
Dentition as in Stenorhina. Head small, not distinct from neck 
eye small, with round pupil; snout pointed and projecting; nostril 
in a single nasal; noloreal. Scales smooth, in 17 rows; ventrals 
rounded. Tail short; subcaudals in two rows. 
Mexico. 
