460 AMBLYOBPHALrD^. 



sixtli, and seventh, entering the eye ; symphysial in contact with a 

 small azygous chin-shield followed by three pairs of chin-shields, 

 the anterior longer than broad. Scales in 15 rows, vertebrals not 

 enlarged. Ventrals 185-195; anal entire; subcaudals 98-126. 

 Body with blackish-brown or reddish dark-edged annuli separated by 

 narrower interspaces which may be whitish, black-spotted, or dark 

 brown above and whitish powdered with brown beneath; head 

 dark brown above. 



Total length 620 millim. ; tail 205. 



Central America. 



a. S (V. 186; C. 100). Mexico. (Type.) 



A. c? (V. 188; C. 114). Hacienda Rosa de Jericho, Dr. E. Rothschuh 

 Nicai-agua, 8250 ft. [0.]. 



21. Leptognathus Mcolor. 



Neopareas bicolor, Oilnth. Biol. C.-Am., Sept. p. 178, pi. Ivi. flg. 

 (1895). 



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

 broader than deep, scarcely visible from above ; internasals two thirds 

 the length of the prsefrontals ; frontal as long as broad, as long as 

 its distance from the end of the snout, shorter than the parietals ; 

 nasal entire ; loreal as long as deep, bordering the eye ; a prseooular 

 above the loreal ; three postoculars ; temporals 2 -|- 3 ; eleven upper 

 labials, fourth to seventh entering the eye ; first lower labial in con- 

 tact with and partially fused with its fellow behind the symphysial ; 

 three large azygous chin-shields, followed by a pair. Scales in 1 5 

 rows, vertebrals not enlarged. Ventrals 195 ; anal entire ; subcaudals 

 129. Annulate black and white, the white annuli much narrower 

 than the black ones, the first across the occiput ; the snout, chin, and 

 upper head-shields black. 



Total length 565 millim. ; tail 190. 



Nicaragua. 



a. S (V. 195 ; 0. 129). Ohontalez, Nicaragua. R. A. Rix, Esq. [C] ; 



W. M. Crowfoot, 

 Esq. [P.]. (Type.) 



4. DIPSAS. 



Dipsas, Laur. 8yn. Rept. p. 89 (1768). 



Bungarus, part., Oppel, Ann. Miis. xvi. 1810, p. 391, 



Dipsas, part., Boie, Isis, 1827, p. 548 ; Wagl. Syst. Amph. p. 180 



(1830) ; Schleg. Phys. Serp. li. p. 257 (1837) ; Cope, Froc. Ac. 



Philad. 1860, p. 265. 

 Dipsadomorus, Dum. ^ Bibr. M4m. Ac. 8c. xxiii. 1853, p. 467, and 



Erp. Gin. vii. p. 468 (1864). 

 Leptognathus, part., Giinth. Cat. Col. Sn. p. 177 (1858); Cope,Proc, 



Ac. Philad. 1868, p. 107. 

 Dipsadomorus, part., Jan, Elenco sist. Ofid. p. 99 (1863). 



Maxillary bone with the toothed border turned inwards, forming 



