3. lEPIOSNATHUS. 459: 



abruptly enlarged. Ventrals 212; anal entire; suboaudals 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 miUim. ; tail 104. 



Costa Rica. 



L. pictiventris, Cope, I. c, 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. Eostral 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 prseoculars, 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. 



Leptognathus dimidiatus, Giinth. Ann. ^ Mag. N. H. (4) ix. 1872, 



p. 31. 

 Petalognathus multifasciatus, Bocourt, Bull. Soc. Philom. (7) viii. 



1884, p. 139. 

 Mesopeltis multifasciatus, Cope, Proc. Amer. Philos. Soc. xxii. 1885, 



p. 172. 

 Leptognathus (Aathenognathus) grandoculis, F. Milll. Verh. Nat. 



Ges. Basel, viii. 1887, p. 271, pi. i. fig. 2. 

 Mesopeltis dimidiatus, Giinth. Biol. C.-Am., Pept. p. 143, pi. li. figs. 



A & B (1895). 



Body very slender, strongly compressed. Eye large. Eostral as 

 deep as broad, scarcely visible from above ; internasals not more than 

 half as long as the praefrontals ; 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 prseocular ; praefrontal entering the eye ; two post- 

 oculars ; temporals 1 -f- 2 ; nine upper labials, fifth and sixth or fifth. 



