OPHIDIA COLUBEIDAE-PITYOPHIS SAYI, MEXICAN US. 539 



This species is very closely allied to P. liexalepis* Cope, from Arizona, 

 discovered by Dr. Coues, but lias a larger tail, four times in length instead 

 of three, besides other specific differences. 



Is not common. 



Genus CYCLOPHIS, Glinther. 

 CYCLOPHIS VEENALIS, De Kay. 



Cohlxr rcrnalis, DE KAY, MSS. EAKLAN, Jonr. Acad.Nat. Sci. Phila., v, 1827, 361. 

 Id, Mod. & Pb.ys. lies., 1835, 124. STORER, Mass. Kept., 1830, 224. HOL- 

 BROOK, N. A. Heip., iii, 184-', 79, pi. xvii. DE KAY, N. Y. Fauua, Reptiles, 

 1842, 40, pi. xi, f. 22. TiiOMr., Hist. Verm., 1842, 117. 



Clilorobcma nrual-is, BAIRD & GIRARD, Cat. N. A. Eept. pt. i, Serp., 1853, 108. 



Ecrj:etoAryas virnulis, HALLOW., Proc. Acad. Nat. Sci. Pbila., viii, Oct., 1856,243. 

 TENKEY, Nat. Hist,, 1866, 304. 



Cijclopliis nrnalis, COPE, Cbeck-List N. A. Batracb. & Kej)r., 1875, 38. 



HAB. Eastern and Austroripariau Regions ; rare in the latter. 



The specimen indicated below is the only one collected by the expedi- 

 tion, and is the first indication of the existence of the species in the Rocky 

 Mountain region. 



Genus PITYOPHIS, Holbrook. 

 P1TYOPHIS SAYI, Scblegel, subspecies MEXICANUS, Duuieril & Bihron. 



Pityophis mcxicanus, DUMERIL & BIBKON, Exp. Gen., vii, 236. 



Pitynphis sayi SCIILEGEL, subspecies mexicanus, DUMERIL & BIBRON, COPE, Cbeck- 

 List N. A. Batracb. & Eept., 1875, 39. 



llAii. Sonoran and Central Regions, entering the Texan District. 



Quite abundant, showing same diversity of coloration as following spe- 



* Phimnthyrn r/m/mwirt 1 , subspecies hexalepis, COPE, Cbeck-List N. A. Batracb. & Eept., 



1873,38. 

 Vhimotltyra hcxalcpis, Proc. Acad. Nat. Sci. Phila.. 1866, 305. 



