13. COLUBRID.^ 



Oklahoma J Brownsville, San Diego, Point Isabelle, Reuters- 

 ville, Cameron County, San Antonio, Eagle Pass, Pecos, San 

 Angelo, Helodes, Jeff Davis County, "South of Claren- 

 don," Kerrville, Texas; and Matamoras and Charco Escon- 

 dido, Tamaulipas, and Ojo del Diable, Chihuahua, Mexico. 



Remarks. — Marcy's Garter-snake may usually be dis- 

 tinguished at a glance by its postoral crescents and the posi- 

 tion of its lateral line. The dorsal spots of certain speci- 

 mens resemble those of certain specimens of T. o. vagrans., 

 but usually are larger. The gastrosteges ordinarily lack 

 the dark markings which are so constant in T. o. vagrans, but 

 frequently are marked with black laterally. The posterior 

 genials usually are longer than the anterior. 



Our specimens from Tucson were caught in mud puddles 

 on the desert a mile or more from the river. 



192. Thamnophis megalops (Kennicott) 



Mexican Garter-Snake 



Plate 94 



Eutania megalops Kennicott, Proc. Acad. Nat. Sci. Phila., i860, p. 



330 (type locality, Tucson and Sta. Magdalena, Arizona); 



Cope, Report U. S. Nat. Mus. for 1898, 1900, p. 1025; Brown, 



Proc. Acad. Nat. Sci. Phila., 1901, p. 21 ; Ditmars, Reptile Book, 



1907, p. 221. 

 Eutania macrostemma Kennicott, Proc. Acad. Nat. Sci. Phila., i860. 



p. 331 (type locality, City of Mexico); Cope, Report U. S. Nat- 



Mus. for 1898, 1900, p. 1029. 

 Eutania flavilabris Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 306 



(type locality, tableland or southern mountains of Mexico); 



Cope, Proc. Am. Philos. See, 1884 (1885), p. 173. 

 Eutania insigniarum Cope, Proc. Am. Philos. Soc, 1884 (1885), p. 172 



(type loc.nlity, Chapultepec, Me.\ico). 

 Tropidonotu! ordinatus var. macrostemma Boulenger, Cat. Snakes Brit. 



Mus., Vol. I, 1893, p. 212. 



