110. TBOPIDODIPSAS. 297 



caiidals 51-74. Black, with 16 to 30 white (red), usually black- 

 dotted acnuli, which may he interrupted on the belly ; snout and 

 ohin black ; throat, and a bar across occiput or nape, white (red). 



Total length 620 millim.; tail 140. 



Mexico and Guatemala. 



A. Most of the annuli interrupted on the belly. 



a. 2 (V. 170 ; C. 51)._ Mexico. (One of the types of T. fasdata.) 



Loreal shield entering the eye, between two pveeooulars, on one side, 



separated from the eye by the prseoculars on the other side. 



h. S (V. 190; C. 56). Yucatan. 



Loreal bordering the eye on both sides. 



c. ? (V. 182; 0.66). ? • Zoological Society. 



Loreal shield entering the eye, between two praeociilars, on one side, 



separated from the eye by the prasoculars on the other side. 



B. Annuli all complete. 



d. tJ (V. 181 ; C. 68). Hacienda Cubilgiitz, north F. C. Sarg, Esq. 



of Cohan, Vera Paz. [P.], 



Loreal bordering the eye on both sides. 



e. d (V. 179 ; C. 66). Orizaba. 



Loreal bordering the eye, longitudinally cleft. 



5. Tropidodipsas annulifera. (Plate XIV. fig. 1.) 



Eye moderate. Rostral a little broader than deep, just visible 

 from above ; internasals half the length of the praefrontals ; frontal 

 as broad as long, slightly shorter than its distance from the end of 

 the snout, much shorter than the parietals ; loreal once and a half 

 as long as deep, entering the eye ; prsefrontal entering the eye ; no 

 praeocular; two postoculars ; temporals 1+2 or 3; six or seven 

 upper labials, third or fourth or fourth and fifth entering the eye ; 

 four or five lower labials in contact with the anterior chin-shields, 

 which are once and a half as long as the posterior. Scales smooth, 

 in 15 rows. Ventrals 156 ; anal entire ; subcaudals 52. Black, 

 with 20 white (red ?) complete annuli, which are broader on the 

 bellv than on the back ; throat, and a band across the occiput, white. 



Total length 430 miUim. ; tail 90. 



Habitat unknown. 



a. S (V. 156 ; 0. 52). ? Zoological Society. 



6. Tropidodipsas anthracops. 



Leptognathus anthracops. Cope, Proc. Ac. Philad. 1868, pp. 108 & 

 136. 



Physiognomy of T. sartorii. Prontal longer than broad ; loreal 

 longer than deep, entering the eye ; no praeocular ; two postoculars ; 

 temporals l-|-2 ; seven upper labials, fourth and fifth entering the 

 eye, sixth largest. Scales smooth, in 13 rows. Ventrals 177 ; 

 anal entire ; subcaudals 76. Black, with yellow rings continuous 

 on the belly, but not on the anterior parts above ; yellow scales 

 black-edged ; temples and nape yellow. 



Total length 480 millim. ; tail 130. 



Nicaragua. 



