PA be COLUBRID. 
90. RHINOCHILUS. 
Rhinocheilus, Baird § Gir, Cat, N. Am. Rept. p. 120 (1853) ; Cope, 
Proc, Ac. Philad. 1860, p. 244; Jan, Arch. Fool Anat. Phy ys. li. 
1863, p. 217; Bocourt, Miss. Se. Mex. , Rept. p. 602 (1886) ; Cope, 
Proc. U.S. Nat. Mus. xiv. 1892, p. 605. 
Maxillary teeth 16 to 19, the two posterior largest; anterior 
mandibular teeth a little larger than the posterior. Head not dis- 
tinct from neck, with pointed, strongly projecting snout; eye 
moderate, pupil round ; rostral large. Body much elongate, cylin- 
drical ; scales smooth, with apical pits*, in 17 to 23 rows. Tail 
moderate; subeaudals entire, or only the posterior divided. 
North America, Mexico, Venezuela. 
Synopsis of the Species. 
PeALOS AY DO iTOWS:.<).\sshocs 20s este t ale ek Se 1. lecontiz, p. 212. 
PC ICHCUAULOSTOWR iis 3's. SBS ciate ee 2. thominoti, p. 2138. 
MCRIEN ATL, VOWS t's) <0) si 00) 2 Shs eae ee 3. anton, p. 213. 
1. Rhinochilus lecontii. 
Rhinocheilus Jecontei, Baird § Gir. Cat. p. 120 (1853), and Rep. 
U.S. Explor. R. Rx. pt. iii. pl. xxxiii. fig. 90 (1859) and U.S. 
Mex. Bound, Surv. ii. Rept. pl. xx. (1859) ; “Jan, Arch. Zool. Anat. 
Phys. ii. 1868, p. 217 ; copes Proc. Ac. Philad. 1866, p. 304; Jan, 
Teon. Gén. 48, pl. iii. fig. 1 (1876); Garm. N. Am. Rept. p. 73 
(1888) ; Bocourt, Miss, Se. Mex., Rept. p. 602, pl. xl. fig. 7 (1886) ; 
Cope, Proc, U.S. Nat. Mus. xiv. 1892, p. 606; Giinth. Biol. C.- 
Am., Rept. p. 100 (1893). 
Rostral as deep as broad, the portion visible from above at least 
half as long as its distance from the frontal ; suture between the 
internasals as long as or a little longer than that between the 
prefrontals +; frontal a little longer than its distance from the end 
of the snout or than the parietals, twice as broad as the supraocular ; 
loreal longer than deep; one or two pre-and two or three post- 
oculars ; temporals 2+ 2 or 243; eight upper labials, fourth and 
fifth entering the eye; three or four lower lJabials in contact with 
the anterior chin-shields ; posterior chin-shields small, and separated 
from each other by two or three series of scales. Scales in 22 rows. 
Ventrals 191-206; anal entire; subcaudals 40-55. Black above, 
with brick-red square spots or cross bands; head and sides black 
aud yellow; lower parts yellowish white, with black spots, at least 
on the sides, 
Total length 940 millim. ; tail 140. 
California to Texas. 
a, b, e. & (V. 191, 205; Duval Co., Texas. W. Taylor, Esq. [C.]}. 
C 49, 50, 6 or 11 last 
divided) & her. (V. 201; 
C. 42, 8 last ‘divided). 
* Stated to be absent in A. thominoti and antonit. 
+ In spec. ¢ the prefrontals are separated by the internasals, which are in 
contact with the point of the frontal. 
