134 OPHIDIA. 
Hab. Mzxico, La Laguna 6500 ft. and Colonia Brizuela in Jalisco (A. C. Buller), 
Guanajuato (Dugés), Mexico city (Geddes), Vera Cruz (Commiss. Geogr.), 
Tehuantepec (Swmichrast). 
10. Tropidonotus validus. 
Regina valida, Kennicott, Proc. Ac. N. Sc. Phil. 1860, p. 884; Cope, Bull. U.S. Nat. Mus. no. 32, 
p. 74: 
Tropidonotus validus, Cope, Proc. Ac. N. Sc. Phil. 1860, p. 342; Bouleng. Cat. Sn. i. p. 237. 
Tropidonotus quadriserialis, Fisch. Verh. naturf. Ver. Hamburg, iii. p. 82, t. 1. fig. 2 (1879) 
(copied by Bocourt, Miss. Sc. Mex., Rept. p. 752, t. 54. figg. 6). 
Hab. Norra America, Utah, Arizona, Lower California. —Mexico, Presidio (forrer), 
Mazatlan (Fischer), Colima (Xantus), San Blas (Dugés). 
11. Tropidonotus grahami. 
Regina grahamii, Baird & Gir. N.-Amer. Rept. p. 47. 
Tropidonotus grahamii, Giinth. Cat. Col. Sn. p.78; Bouleng. Cat. Sn. i. p. 240. 
Tropidonotus leberis, var. grahami, Jan, Iconogr. Ophid. xxvii. t. 5. fig. 1. 
Hab. NortH America, Michigan to Texas.—? MrExico. 
The occurrence of this snake in Mexico is doubtful, the specimens in the British 
Museum, labelled with that locality, having been obtained from a dealer. 
12. Tropidonotus sipedon. 
Coluber sipedon, Linn. Syst. Nat. ed. 1768, i. p. 219; ed. 1766, 1. p. 379. 
Tropidonotus sipedon, Holbr. N.-Amer. Herpet. iv. p. 29, t. 6. 
Coluber fasciatus, Linn. Syst. Nat. ed. 1766, 1. p. 378. 
Tropidonotus fasciatus, Boie, Isis, 1827, p. 535; Holbr. N.-Amer. Herpet. iv. p. 25, t. 5; Giinth. 
Cat. Col. Sn. p. 76; Dum. & Bibr. Erpét. vii. p. 566; Jan, Iconogr. Ophid. xxvi. t. 8 ; 
Bouleng. Cat. Sn. i. p. 242. 
Tropidonotus rhombifer, Hallow. Proc. Ac. N. Sc. Phil. 1852, p. 177; Jan, Iconogr. Ophid. xxvi. 
t. 4. fig. 2; Cope, Bull. U.S. Nat. Mus. no. 32, p. 73; Bocourt, Miss. Sc. Mex., Rept. 
p- 751, t. 54. figg. 5. 
Tropidonotus pogonias (part.), Dum. & Bibr. Erpét. vi. p. 574. 
Hab. Norvu America, east of the Rocky Mountains.—Mexico, Tampico (Richardson), 
Misantla (Commiss. Geogr.); Costa Rica, Cartago (Mus. Brit.). 
| TRETANORHINUS. 
Tretanorhinus, Dum. & Bibr. Erpét. vii. p. 848 (1854). 
1. Tretanorhinus nigroluteus. 
Tretanorhinus nigroluteus, Cope, Proc. Ac. N. Sc. Phil. 1861, p. 298; 1868, p. 8309; Proc. Am. 
Phil. Soc. xxii. p. 183 (1885); Giinth. Ann. & Mag. N. H. 1872, ix. p. 27; Bocourt, Le 
Nat. 1891, p. 122; Bouleng. Cat. Sn. i. p. 282. 
