192 OPHIDIA. 
CROTALOPHORUS. 
Crotalophorus (Linneus), Gray, Ann. Phil. 1825, p. 205. 
1. Crotalophorus miliarius. 
Crotalus miliarius, Linn. Syst. Nat. i. p. 372. 
Caudisona rava, Cope, Proc. Ac. N. Sc. Phil. 1865, p. 191. 
Crotalophorus ravus, Cope, Proc. Am. Phil. Soc. 1885, p. 382. 
Crotalus miliarius, var. ravus, Garman, Mem. Mus. Comp. Zool. viii. p. 120 (1884). 
Hab. Mexico, Tableland of Southern Mexico (Cope), Puebla (Com. Geogr.). 
CROTALUS. 
Crotalus, sp., Linnzeus, Syst. Nat. i. p. 372 (1766). 
1. Crotalus triseriatus. 
Uropsophus triseriatus, Wagl. Nat. Syst. Amphib. p. 176. 
Crotalus triseriatus, Cope, Proc. Am. Phil. Soc. xxii. p. 179 (1885) ; Bull. U. S. Nat. Mus. no. 82, 
p. 90. 
Crotalus lugubris, A. Dugés, La Naturaleza, iv. p. 25 (1877) (nec Jan). 
Hab. Mexico, Guanajuato (A. Dugés), Toluca, Zacualtipan, and Jalapa (Cope), Orizaba 
(Mus. Brit.). 
2. Crotalus polystictus. 
Caudisona polysticta, Cope, Proc. Ac. N. Sc. Phil. 1865, p. 191. 
Crotalus polystictus, Cope, Proc. Am. Phil. Soc. 1884, p. 179; Bull. U.S. Nat. Mus. no. 82, p. 89; 
A. Dugés, La Naturaleza, (2) 1. p. 184, t. 12. fig. 12 (head) (1888). 
Crotalus lugubris, Jan, Prodrom. p. 31; Iconogr. Ophid. xlvi. t. 3. fig. 3. 
Crotalus jimenezii, A. Dugés, La Naturaleza, iv. p. 23, t. 1. figg. 18-20 (1877). 
Hab. Mexico, Colima and Guanajuato (A. Dugés), Valley of Mexico (Herrera). 
Probably identical with the preceding. 
3. Crotalus intermedius. 
Crotalus intermedius, Fisch. Abh. naturw. Ver. Bremen, vii. p. 280, t. 14. figg. 1-4: (head) (1882). 
Hab. Mexico (Sallé). 
4, Crotalus omiltemanus, sp. n. (Tab. LVIII. fig. C.) 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith). 
This species belongs to the group Uropsophus, and is distinguished from the other 
allied forms by the small number of labial shields and large number of ventral 
scutes. 
