914 16. CROTALIDZ 
part of the upper surface of the head. It is a large species 
and very handsomely colored. 
Habits—While this snake, like others of the genus, 
doubtless spends most of its life on the ground, Cope men- 
tions one which he discovered in the act of springing through 
a bush. It was suspended over a branch, and was heavy in 
its movements, except at the moment of leaping. 
209. Crotalus atrox Baird & Girard 
Desert DiamMonpb RATTLESNAKE 
Plates 100, 107, and 108 
Crotalus atrox Barrp & Girarp, Cat. N. Amer. Rept., Pt. 1, Serpents, 
1853, pp. 5, 156 (type locality, Indianola, Texas); Dumérit et 
Bisron, Erpétologie Générale, Vol. VII, Pt. 2, 1854, p. 1482; 
Hatiow_E Lt, Proc. Acad. Nat. Sci. Phila., 1856, p. 307; Barrp, 
U. S. Mex. Bound. Surv., Vol. II, 1859, p. 14, pl. I; Bairp, Rep. 
Pac. R. R. Surv., Vol. X, 1859, p. 39, pl. XXIV, fig. 3; Cops, Proc. 
Acad. Nat. Sci. Phila., 1859, p. 337; Cooper, Proc. Cal. Acad. 
Sci., Vol. IV, 1870, p. 66; Cope, in Yarrow, Surv. W. rooth Merid., 
Vol. V, 1875, p. 534; STEJNEGER, Report U. S. Nat. Mus. for 1893, 
1895, p. 436, pl. 11; Van Densurcu, Proc. Cal. Acad. Sci., Ser. 
2, Vol. VI, 1896, p. 348; STEJNEGER, Proc. U. S. Nat. Mus., Vol. 
XXV, 1902, p. 158; Bartey, N. Amer. Fauna, No. 35, 1905, p. 493 
Dirmars, The World Today, Oct. 1896, p. 1049; Dirmars, Reptile 
Book, 1907, p. 452, pls. CX XIX, fig. 2, CX XX, fig. I, CXXXII; 
RurHven, Bull. Amer. Mus. Nat. Hist., Vol. XXIII, 1907, p. 591; 
STRECKER, Proc. Biol. Soc. Washington, Vol. XXI, 1908, p. 78; 
Ex.uis & HENDERSON, Univ. Colorado Studies, Vol. X, No. 2, 1913, 
p. 108; Van DensurcH & Stevin, Proc. Cal. Acad. Sci., Ser. 4, 
Vol. 3, 1913, p. 426; SrreckeR, Baylor Bulletin, Vol. XVIII, No. 
4, 1915, p. 44; GrinnELL & Camp, Univ. Cal. Publ. Zool., Vol. 
17, No. 10, 1917, p. 196; VoruieEs, Univ. Ariz. Agric. Exper. Station 
Bull. No. 83, 1917, p. 359; SreyNEcER & Barsour, Check List 
N. Amer. Amph. Rept., 1917, p. 108; Cow.es, Journ. Entomol. 
& Zool., Pomona College, Vol. XII, No. 3, 1920, p. 66. 
Crotalus adamanteus atrox Jan, Rev. Mag. Zool., 1859, p. 153; Jan, 
Elenco Sist. degli Ofidi, 1863, p. 123; Cope, Bull. U. S. Nat. Mus., 
