690 NORTH AMERICAN SNAKES COPE. 



Top of head with plates on canthus, aud scales between ; generally one loreal plate ; 

 dorsal rhombs paler than bands of tail, which is not black at end; 



C. a. air ox. 

 Scales of canthus rostralis not larger than those between them; one loreal plate; 

 red, dorsal rhombs not distinct ; tail white with black bauds ; 



C. a. ruber. 



Crotalus adamanteus scutulatus Kenn. 



Cope, Check List Batr. Kept. N. Amer., 1875, p. 33; Report U. S. G. G. Surv. W. 100th 

 Mer., V. 1875, p. G07 ; Proc. Am. Philos. Soc, 1885, p. 287. 



Caudisoiia scutulata Kenn., Proc. Acad. Phila. 1860, p. 207; Cope, Proc. Acad. Phila., 

 1866, p 307-309. 



Arizona and Chihuabua. 



Crotalus adamanteus adamanteus Beauv. 



Cope, Check List Batr. Rept. N. Amer., 1875, p. 33. 



Crotalus adamanteus Pal. de Beau vols, Trans. Am. Phil. So;-. i\^, 1799, 368; Holbrook, 



N. Am. Herp., iii, 1842, 17; Bd. and Gird., Cat. Serpt. N. Amer. 18.53, 



p. 3; Le Conte, South. Med. and Snrg. Journ. ix, 1853,664, Jau Icon. 



Gen. Ofid. 46 ii. Fig. 2. 

 Crotalus horridus Bounat. O^jhiologie, 1790, p. 1. Excl. cit. Linn. Mus. Ad. Fried, et 



Tab. 

 Crotalus rhombifer Latreille, Hist. Rept. in, 1801, 197"; Daudio, Hist. Rept.,v, 1802, 



.525; Dum^ril, Bibrou, Erp. Gen., vii, 1854, 1471. 

 Crotalus durissus Shaw, Gen. Zool., ii, 1802, 333. 

 Crotalus terrificus Le Conte, Proc. Acad. Nat. Sci. Phila. vi, 1853; Exclus. homou. 



Caudisona terrifica Laur. p. 418; Cope, loc. cit. 1859, p. 337. Exclus. 



homon. terrifica Laur. 

 Crotalus oregonus Holbrook, N. Amer. Herp. in, 1842, 21 ; Bd. aud Gird. ; Cat. Serpt. 



1853, p. 145. 

 Icones, fShaw, Gen. Zool. in, t. 1. xxxix. Daudin, Hist. Rept. v, PI. ix, Figs. 22, 



23. Holbrook, N. Amer. Herp., in, t. il. U. S. Pacific R. R. Rept. 



Reptiles, tab. xxiv, f. 2. 



Aiistroripariau region. 



Crotalus adamanteus atrox Bd. and Gird. 



Cope, Check List Batr. Rept. N. Amer., 1875, p. 33; Report U. S. G. G. Survey W. 



100th Mer. v, 1875, ]>. G07. 

 Crotalus atrox Bd. aud Gird., Cat. Serp. N. Amer., 1853, p. 5 ; Baird, U. S. and Mex. 



Bound. Surv. Reptiles, 1859, p. 1 ; U. S. Pacific R. R, Rept., X, Whipple's 



Rept. 

 Icones, U. S. and Pac. R. R. Rept. Reptiles, t. xxiv, f. 3, U. S. aud Mex. Bound. 



Surv., Reptiles, t, i. Crotalus adamanteus Jan, Icon. Gen. Ofid. in, 46, ii, Fig. 1. 



Sonorau region ; dry parts of Texas ; Lower California. 



Crotalus adamanteus ruber Cope. 



Rostral plate a little wider than high; plates of upper side of can- 

 thus rostralis smaller than in other subspecies, the posterior especially 

 smaller than the anterior, and partly decurved laterally. One loreal. 

 Five rows of scales between orbit aud labial; eight rows between super- 



