606 ZOOLOGY REPTILES AND BATRACHIANS OF ARIZONA. 



form, except the two anterior ; two frontals ; four post-frontals ; two inf er- 

 supercilia, all in contact ; five rows of scales between labials and suborbital 

 row; middle row not extending beyond the middle of the orbit; labials 18 

 above, fifth and sixth largest ; 17 below ; dorsal rows of scales 29 ; two ex- 

 ternal rows small ; tail uniform black ; color roll-sulphur, a series of chest- 

 nut-brown transverse lozenges, with exterior comers produced to the abdo- 

 men ; centers of lozenges with one or two spots ; each scale but one color ; 

 a brown patch below and behind the eye. "One of the most strongly marked 

 of all the species " (B. & G.). Top of muzzle with tliree pairs of symmetrical 

 shields; rattle parallelogrammic (Cope). 



San Francisco Mountains, on dry, rocky ground, July, 1864. 



42. Caudisona lucifer, (Bel. & Gir.) Cope. Black Rattlesnake. 



Crotulus lucifer, BD. & GIR., Proc. Acad. Nat. Sci. Phila., vi, 1852, 177. J7., Cat. 



N. A. Re.pt., 1853, G. GIR., U. S. Exp. Exped., 1858, 187, pi. 15, figs. 



1-0. BD., P. R, R. Rep., x, 1859, Williamson's & Abbott's Route, Reptiles, 



10, pi. 11. COOP. & SUCKL., Nat. Hist. Wash. Terr., 1860, 295. COPE, 



Check-List, 1875, 33. 

 Caudisona lucifer, COPE, Mitchell's Res., 1861, 121. Id., Proc. Acad. Nat. Sci. Phila., 



1806, 307, 309. 



Head short, broad, and deep, with much rounded angles ; snout less 

 pointed than in C. conflucnta. Labials 1516 above and below; dorsal 

 rows, 25. A dorsal series of brown blotches not margined with white ; two 

 small irregular lateral series on each side. Posteriorly, 15-20 half-rings, 

 becoming blackish in old specimens. Light stripe from orbit below super- 

 ciliary to angle of jaw above labials. Light stripe before eye expanding upon 

 the whole of the upper labials and front and sides of face below crown and 

 in front of orbits. Single light transverse line on superciliaries often obso- 

 lete. Rostral not edged with lighter. (Kennicott.) Rattle parallelogrammic; 

 rostral elevated, narrow, cuneiform ; muzzle with two marginal shields above 

 each canthus rostralis, and numerous small plates above. (Cope.*) 



Originally described from Oregon, as above. This species was subse- 

 quently found in California, and later its range was shown to include Ari- 

 zona by Dr. B. J. D. Irwin, U. S. A., and myself. 



My numerous specimens from Arizona are nearly black, especially on 

 the head, differing so decidedly from the Oregon type as to probably war- 



