108 COLUBRID. 
the prefrontals ; frontal once and one third as long as broad, as 
long as its distance from the rostral, shorter than the parietals ; 
nasal elongate, divided; loreal present, once and a half as long as 
deep ; one preocular, not reaching the frontal; two postoculars ; 
temporals 1+2; eight upper labials, fourth and fifth entering the 
eye ; five lower labials in contact with the anterior chin-shields, 
which are shorter than the posterior.. Scales in 15 rows, all except 
the outer strongly keeled; caudal scales smooth, except the basal 
ones. Ventrals without trace of lateral keel, 171; anal divided; 
subeaudals 171. Uniform olive-green above, pale green beneath ; 
lips and throat yellowish; a blackish streak on each side of the 
head, behind the eye. 
Total length 1300 millim.; tail 540. 
Guatemala. 
a. d (V.171; ©.171). Rio Chisoy, below the 0. Salvin, Esq. [P.]. 
town of Cubulco. (Type.) 
4. Leptophis mexicanus. 
Leptophis mexicanus, Dum. § Bibr. vii. p. 536 (1854) ; Jan, Icon, 
Gén. 49, pl. vi. fig. 5 (1879). 
Aheetulla mexicana, Giinth. Cat, p. 154 (1858). 
Thrasops mexicanus, Cope, Proc. Ac. Philad, 1860, p. 557. 
Hapsidophrys mexicanus, Cope, Proc. Am. Philos. Soe. xxii.°1885, 
p. 382, 
Rostral broader than deep, just visible from above; internasals 
as long as or a little shorter than the prefrontals; frontal once and 
one third to once and two thirds as long as broad, as long as its 
distance from the end of the snout, a little shorter than the 
parietals ; nasal elongate, divided ; loreal present, twice to thrice as 
long as deep; one preocular, not reaching the frontal ; two post- 
oculars; temporals 1+2; eight upper labials, fourth and fifth 
entering the eye; four or five (rarely six) lower labials in contact 
with the anterior chin-shields, which are shorter than the posterior. 
Scales in 15 rows, striated, all except the outer row strongly keeled ; 
caudal scales keeled. Ventrals feebly angulate laterally, 154-174; 
anal divided; subcaudals 141-172. 
Total length 1340 millim. ; tail 520. 
Northern Mexico to Costa Rica, 
A. Pale bronzy brown or golden above, head blue or green; a 
black lateral stripe on the head and body, passing through 
the eye, enclosing some bluish-green spots in the anterior half 
of the body; upper lip and lower parts mother-of-pearl or 
pale golden. 
a. Her. (V.166; C.162). Amula, Guerrero. Mr. H. H. Smith [C.]; 
ee D. Godman, Esq. 
ah 
b. Hgr. (V.164; 0.156). Teapa, Tabasco. Fp Godman, Esq. 
PB. 
