110. TB0PID0DIP8AS. 297 



caudals 51-74. Black, with 16 to 30 white (red), usually Ijlack- 

 dottod aiinuli, which may be interrupted on the belly ; suout and 

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



Total length G20 millim. ; tail 140. 



Mexico and Guatemala. 



A. Most of the annuli interrupted on the belly. 



a. 2 (^^- 170; C. 51). Mexico. (One of the types of T: fasciata.) 

 lioreal shield entering the eye, between two prseoeulars, on one side, 



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



b. 2 (V. 190; C. 5(5). Yucatan. 

 Loreal bordering the eye on both sides. 



c. $ (V. 182; C. 56). ? Zoological Society. 



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



separated from the eye by tlie pr£eoculars on the other side. 



B. Annuli all complete. 



d. (S (V. 181 ; C. 68). Hacienda Cubilgiitz, north F. C. Savg, Esq. 



of Cohan, Vera Paz. [I*-]- 



Loreal bordering the eye on both sides. 

 c. 6 (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 prsefrontals ; 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 8; 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 postei'ior. Scales smooth, 

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

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

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



Total length 430 millim. ; tail 90. 



Habitat unknown. 



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



6. Tropidodipsas anthracops. 



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

 136. 



Physiognomy of T. sctrtorii. Frontal longer than broad ; loreal 

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

 temporals 1 + 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. ; taU 130. 



Nicaragua. 



