NATURAL SCIENCES OF PHILADELPHIA. 183 



rostral. Six or seven in the supraocular series. Interparietal lanceolate- 

 Across the middle of the nape, between lines continuous with the temporal 

 ridge, eleven rows of scales may be counted. Cheek with rather large keeled 

 scales ; four thick marginal auricular scales. Labials five five. Prebrachial 

 folds conspicuous. Dorsal crest high, higher upon the origin of the tail. The 

 tail is very much compressed. Posterior extremity reaching tympanum. 

 Length from muzzle to vent 2 in. 11 lin. ; vent to end of tail 5 in. 4 lin. ; 

 greatest depth of tail 4 lin. 



Above light brown, many of the scales with greenish shades ; a few median 

 black spots on the nape. Side of the head, and posteriorly nearly to axilla, 

 also chin and jaw, black. Beneath bluish green, the sides of the abdomen, 

 the hinder extremities and tail, varied with greenish white scales. 



Habitat. Hayti (near Jeremie). Sent in a valuable collection made by 

 Dr. D. P. Weinland to Prof. Agassiz. Mus. Comparative Zoology, Cambridge, 

 Mass. 



The West Indian Liocephali, with smooth ventral scales, possess either 

 three pairs of fronto-nasal plates in addition to the supranasals, or only two. 

 Of the former description are L. carinatus Gray (microlophus Coct. Bibr.) 

 L. vittatus Hallow, (schreibersii Gray), L. macropus n. sp., L. schrei- 

 b e r s i i and L. melanochlorusn. sp. Those of the latter kind are L. 

 ravicepsn. sp., L.trigeminatusn. sp. and the subject of the preceed- 

 ing description. 



Liocephalus trigeminatus. 



Head shields slightly keeled, not lanceolate ; first internasal not in contact 

 with rostral ; six or seven supraoculars ; interparietal lanceolate. Ten nuchal 

 rows. Nuchal and dorsal crest low, caudal elevated. Labials six five ; 

 temporal scales large ; two principal marginal auricular. Lateral neck folds 

 very strong. Post auricular scales not granular. Posterior extremity not 

 quite reaching orbit. Tail much compressed. Length from muzzle to vent 

 2 in. 1 lin. ; vent to end (?) of tail 2 in. 10 lin. ; of hinder extremity 1 in. 

 6 lines. 



Above olivaceous brown, with four narrow, transverse, blackish brown 

 bars, bordered behind with lighter ; the posterior between the groins. Tail 

 spotted above, a light lateral band from the orbit to the base of the tail, and 

 another from the ear to the groin ; between these brown with a few vertical 

 blackish brown bars. Beneath dirty greenish white, chin spotted with 

 brownish. 



Bab. Hayti, near Jeremie. Dr. Weinland's Coll. in Mus. Compar. Zool. 



Liocephalus raviceps. 



First internasal often in contact with rostral. Head scales generally 

 strongly keeled. Posterior fronto-nasals remarkably large. Six or seven 

 supraoculars. Interparietal elongate triangular, short. Fifteen nuchal rows, 

 (counted as in p e r s o n a t u s). Nuchal dorsal and caudal crest equal, little 

 developed. Tail nearly cylindrical. Labials five six ; cheek scales rather 

 small ; five large marginal auriculars ; post auriculars not granular. All the 

 scales of the body small. Posterior extremity reaching ear or angle of mouth. 

 Length from muzzle to vent 3 in. 1 lin. ; from vent to end of tail 4 in. 4 lin. ; 

 of posterior extremity 2 in. 



Above yellowish brown, with many short, narrow, black longitudinal lines, 

 which are sometimes arranged as a double series of dorsal spots. A dark 

 band from the eye to the groin, which becomes obsolete in age, and is bounded 

 beneath by a rather broad yellowish vitta which is permanent. Beneath yel- 

 lowish, under surfaces of limbs and abdomen and sides as far as the jaws 

 varied with ? yellow (white in spirits) scales. Tail with brown chevron- 

 shaped crossbands. Top of head light yellowish brown. 



Hab. Eastern Cuba. Mr. C. Wright discoverer. Mus. Smithsonian (No. 

 4162) and Academy Phila. 



1862.] 



