PITUOPHIS.—DRYMOBIUS. 125 
3. Pituophis elegans. 
Arizona elegans, Kennicott, U.S. Mex. Bound. Survey, ii. Rept. t. 13, p. 18; Bocourt, Miss. Sc. 
Mex., Rept. p. 676, t. 46. figg. 3, 3 a, d. 
Rhinechis elegans, Cope, Proc. Am. Phil. Soc. xxiii. p. 284 (1886). 
Hab. Nortu America, Southern United States—Mexico, Chihuahua (Cope). 
4. Pituophis melanoleuca. 
Coluber melanoleucus, Daud. Hist. Rept. vi. p. 409. 
Pituophis melanoleucus, Holbr. N. Amer. Herpet. iv. t.1, p. 7; Dum. & Bibr. Erpét. vii. p. 233 ; 
Ginth. Cat. Col. Sn. p. 86. 
Pituophis mexicanus, Dum. & Bibr. Erpét. vii. p. 236, t.62; Giinth. Cat. Col. Sn. p.87; Jan, Iconogr. 
Ophid. xxii. t. 2; Bocourt, Miss. Sc. Mex., Rept. p. 674, t. 42. figg. 4, 4a-e, t. 47. fig. 6. 
Churchillia bellona, Baird & Girard, in Stansbury’s Explorat., Rept. p, 350. 
Pituophis bellona, Giinth. Cat. Col. Sn. p. 87. 
Pituophis sayi (Schleg.), Cope, Bull. U.S. Nat. Mus. no. 32, p. 72. 
Hab. Norta America, United States—Muxico, Nuevo Leon (Taylor), Colima and 
Chihuahua (Cope). 
I conclude, from an examination of numerous specimens in the British Museum, that 
neither the number of labial shields nor that of series of scales can safely be used as 
characters to separate specifically southern from northern or western specimens. 
DRYMOBIUS. 
Drymobius, Fitzinger, Syst. Rept. p. 26 (1842). 
1. Drymobius margaritiferus. 
Herpetodryas margaritiferus, Schleg. Ess. ii. p. 184; and Abbild. t. 44. figg. 19, 20. 
Drymobius margaritiferus, Fitz. Syst. Rept. p. 26; Cope, Bull. U.S. Nat. Mus. no. 32, p. 70; 
Bocourt, Miss. Sc. Mex., Rept. p. 716, t. 49. figg. 2, 2 a-d. 
Leptophis margaritiferus, Dum. & Bibr. Erpét. vii. p. 539. 
Dromicus margaritiferus, Giinth. Cat. Col. Sn. p. 126; Salv. P.Z.S. 1860, p. 456, 
Thamnosophis margaritiferus, Jan, Iconogr. Ophid. xxxi. t. 6. fig. 3. 
Hab. Mexico, Colima (Xantus), Presidio (Forrer), Zacualtipan, Tuxpan, Misantla, 
Coatzacoalcos (Cope), Santo Domingo de Guzman (A. 0. Buller), Omilteme in Guer- 
rero, Atoyac in Vera Cruz, Teapa in Tabasco (H. H. Smith), Tehuantepec (Sumi- 
chrast); British Honpuras, Belize (Mus. Brit.) ; GuatemMata, Duefias and Lanquin 
(Salvin) ; Costa Rica (Gabd); Panama (Leconte). 
2. Drymobius boddeertii. 
Coluber boddertii, Seetzen, in Meyer’s Zool. Archiv, ii. p. 59 (1796). 
Herpetodryas boddertii, Schleg. Ess. ii. p. 185 ; Dum. & Bibr. Erpét. vii. p. 210; Giinth. Cat. Col. 
Sn. p. 115; Salv. P. Z.S. 1860, p. 456 ; Jan, Iconogr. Ophid. xlix. t. 1. fig. 1. 
