3, LEPTOGNATHUS. 459 
abruptly enlarged. Ventrals 212; anal entire; subcaudals 121. 
Greenish-ash above, with two series of alternating light ocelli with 
black borders; a large black-bordered ocellus on the nape; head 
vermiculated with black; lips yellow, with black specks; below 
yellow, with a lateral series of black-edged ocelli, like those of the 
back. 
Total length 345 millim. ; tail 104. 
Costa Rica. 
L. pictiventris, Cope, l. ¢., from the same locality, appears to 
agree in structure with the preceding, differing, however, con- 
siderably in coloration. The specimen is besides stated to be in 
bad condition. 
19. Leptognathus sanniola. 
Mesopeltis sanniolus, Cope, Proc. Ac. Philad. 1866, p. 318. 
Snout contracted from under the orbit; eye large. Rostral not 
visible from above; frontal nearly twice as long as broad in the 
middle, nearly as long as the parietals ; nasal divided; loreal nar- 
row, erect; two very narrow preoculars, the inferior very small; 
eight or nine upper labials, fourth and fifth entering the eye ; anterior 
chin-shields united into an azygous ovoid shield which is in contact 
with the symphysial; posterior chin-shields quite small. Scales in 
15 rows, vertebrals not enlarged. Ventrals 156; anal divided ; 
subcaudals 55. Above light brown, with one series of small dark 
brown spots on the spine, separated by intervals nearly equal to 
their diameter ; a broad muchal band continued to middle of frontal 
shield; lips and sides with numerous pale brown spots; beneath 
with minute brown punctulations. 
Total length 280 millim. (tail not included). 
Yucatan. 
20. Leptognathus dimidiata. 
eg a dimidiatus, Giinth. dnn. § Mag. N. H. (4) ix.1872, 
3 
p. dl. 
Petalognathus multifasciatus, Bocourt, Bull. Soc. Philom. (7) viii. 
1884, p. 139. 
epee multifasciatus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, 
172 
p- 172. 
Leptognathus (Asthenognathus) grandoculis, F. Miill. Verh. Nat. 
Ges. Basel, viii. 1887, p. 271, pl. i. fig. 2. 
Mesopeltis dimidiatus, Ginth. Biol. C-Am., Rept. p. 143, pl. li. figs. 
A & B (1895). 
Body very slender, strongly compressed. Eye large. Rostral as 
deep as broad, scarcely visible from above ; internasals not more than 
half as long as the prefrontals; frontal a little longer than broad, 
as long as its distance from the end of the snout, shorter than the 
parietals ; nasal entire ; loreal once and a half as long as deep, border- 
ing the eye; no preocular; prefrontal entering the eye; two post- 
oculars ; temporals 1+2; nine upper labials, fifth and sixth or fifth, 
