136 . OPHIDIA. 
1. Ischnognathus dekayi. 
Tropidonotus dekayi, Holbr. N.-Amer. Herp. iv. p. 53, t. 14. 
Ischnognathus dekayi (part.), Dum. & Bibr. Erpét. vii. p. 507. 
Ischnognathus dekayi, Giiuth. Cat. Col. Sn. p. 81; Salv. P.Z.S. 1860, p. 456; 1861, p. 228; 
Bouleng. Cat. Sn. i. p. 286. 
Storeria dekayi (Holbrook), Cope, Bull. U.S. Nat. Mus. no. 32, p. 75; Bocourt, Miss. Sc. Mex., 
Rept. p. 742, t. 53. figg. 1, 2. 
Storeria tropica, Cope, Proc. Am. Phil. Soc. xxii. p. 175 (1885). 
Storeria dekayi, var. anomala, Dugés, Proc. U. S. Nat. Mus. xi. p. 9, cum fig. (1888) ; La Natu-- 
raleza, 1890, p. 401. 
Hab. Norra Amurica.—Mexico, Guanajuato (Dugés), Vera Cruz (Cope), Orizaba 
(Godman, Dugés); GuaTeMALA, Coban, San Gerénimo (Salvin), Peten (Hague). 
2. Ischnognathus occipito-maculatus. 
Coluber occipito-maculatus, Storer, Rep. Fish. & Rept. Mass. p. 280. 
Storeria occipito-maculata, Baird & Gur. N.-Amer. Rept. p. 137; Cope, Bull. U.S. Nat. Mus. 
no. 32, p. 75; Bocourt, Miss. Sc. Mex., Rept. p. 745, t. 53. figg. 6. 
Ischnognathus occipito-maculatus, Giinth. Cat. Col. Sn. p. 81; Jan, Iconogr. Ophid. xxx. t. 1. fig. 2.. 
Ischnognathus dekayi (part.), Dum. & Bibr. Erpét. vii. p. 507. 
Hab. Norra Amertca.—Mexico, Zacualtipan in Hidalgo (Cope). 
The occurrence of this species in Mexico rests at present solely on Cope’s authority. 
3. Ischnognathus storerioides. 
Tropidoclonium storerioides, Cope, Proc. Ac. N. Sc. Phil. 1865, p. 190. 
Storeria storerioides, Garman, N.-Amer. Rept. p. 29. 
Natrix storerioides, Cope, Proc. U. 8. Nat. Mus. xi. p. 391 (1889). 
Ischnognathus storerioides, Bouleng. Cat. Sn. 1. p. 288. 
Hab. Mexico, Ciudad in Durango (Forrer), Mexico city (Doorman), J alisco to 8500 feet 
(A. C. Buller). 
A young specimen from Ciudad in Durango does not show any sign of a division of 
the nasal shield; probably with the growth of the snake such a division would have 
taken place. 
4. Ischnognathus copii. 
Adelophis copei (Dugés), Cope, Proc. Am. Phil. Soc. xviii. p. 265 (1879); La Naturaleza, i. 
p. 18, t. 8. fig. 1 (1887) (copied in Bocourt, Miss. Sc. Mex., Rept. p. 739, t. 53. fige. 3). 
Ischnognathus copii, Bouleng. Cat. Sn. i. p. 289. 
Hab. Mexico, Guadalajara. 
Ido not know this snake from autopsy, and entertain some doubts as to its perti- 
nence to Ischnognathus. 
