580 ZOOLOGY BATRACHIANS AND REPTILES. 



Caudlsona lucifer, COPE, App. Mitchell's Res., 1801, 121. Id, Proc. Acad. Nat. Sci. 

 Phila., I860, 307-309. 



HAB. Pacific Subrcgion ; mountains of Arizona. 



Stated by Professor Cope to be numerous at some points in Arizona. 

 During the expedition but one was seen, and Arizona is its most eastern 

 range. In California it is very common. 



CROTALUS CONFLUENTUS, Say. 



Crotalvs confluentus, SAY, Long's Exped. Rocky Mts., ii, 1823, 48. BAIRD & GIRARD, 



Cat. N. A. Kept., pt. i, Serp., 1853, 8. BD., P. R. R. Rep., x, 1859, 40. Id. 



U. S. & Mex. Bound. Surv., ii, Kept,, 1859, 14. COOP. &SUCKL., Nat. Hist. 



Wash. Terr., I860, 295. COPE, Check-List N. A. Batrach. & Kept,, 1875, 33. 

 Caudisona confluenta, COPE, App. Mitchell's Res., 18G1, 122. Id., Proc. Acad. Nat. Sci. 



Phila., 1866,307. ALLEN, Proc. Bost. Soc. Nat. Hist., xvii, 1874, 307-309. 

 Crotahts kcontt'i, H ALLOW., Proc. Acad. Nat. Sci. Phila., vi, 1851, 180. Id., Sitgreave's 



Exp. Zufii & Col. Riv., 1853, 139. Id., P. R, R. Rep., x, 1859, IS. HEERM., 



P. R. R. Rep., x, 1859, 25. 

 Caudisona Iccontei, COPE, App. Mitchell's Res., 1861, 121. UAYD., Trans. Am. Phil. 



Soc., xii, 18G2, 177. 



Catidisona confluent a var. lecontei, COPE, Proc. Acad. Nat. Sci. Phila,, 1866, 307. 

 Crotahts cineroeus (sic), LEG. apud HALLOW., Sitgreave's Exp. Zufii & Col. Riv , 1853, 140. 



NOTE. De Kay in Nat, Hist. State of N. Y., 1842, pt. iii, 55, gives C. dvriasus, 

 Linn., as a synonym, marked with an interrogation point. 



HAB. Central and Souoran Regions, entering Texan District of the Austro- 

 riparian. 



This species is upon the western plains and mountains the most numer- 

 ous of the Crotalidcc. It exhibits in a marked degree the mimicry of color- 

 ation so often seen in reptiles, varying from deep-brown to bright-gray. 

 Specimen P 3 is a variety with the muzzle scutella much like C. scutulatus, 

 Kenn. ; No. 2 resembles it also, but in a less marked degree. 



