48. CROTALUS 911 
208. Crotalus molossus Baird & Girard 
BLACK-TAILED RATTLESNAKE 
Plates 99 and 106 
Crotalus molossus Bairp & Grrarp, Cat. N. Amer. Rept., Pt. I, Serpents’ 
1853, p. 10 (type locality, Fort Webster, St. Rita del Cobre, 
New Mexico); Dumérit et Bisron, Erpétol. Génér., Vol. VII, 
1854, p. 1482; Barrp, Rep. U. S. Mex. Bound. Surv., Vol. II, 
Rept., 1859, p. 14, pl. 2; Cope, Proc. Acad. Nat. Sci. Phila., 1859, 
p- 338; Bairp, Rep. Pac. R. R. Surv., Vol. X, Rept., pl. XXIV, 
fig. 5; Cope, Bull. U. S. Nat. Mus., No. 1, 1875, p. 33; Cope, in 
Yarrow, Surv. W. rooth Merid., Vol. V, 1875, p. 533; Cope, 
Proc. Acad. Nat. Sci. ‘Phila., 1883, p. 12; Garman, Mem. Mus. 
Compr. Zool., Cambr., Vol. VIII, No. 3, 1883, p. 113; YARRow, 
Bull. U. S. Nat. Mus., No. 24, 1883, pp. 12, 78; Garman, Bull. 
Essex Inst., Vol. XIX, 1888, p. 123; Cope, Proc. U. S. Nat. Mus., 
Vol. XIV, 1892, p. 688; SreyNEGER, Report U. S. Nat. Mus. for 
1893, 1895, p. 424, pl. 8; Van Denpurau, Proc. Cal. Acad. Sci., 
Ser. 2, Vol. 6, 1896, p. 348; Cope, Report U. S. Nat. Mus. for 
1898, 1900, p. 1154, fig. 330; Brown, Proc. Acad. Nat. Sci. Phila., 
IgOI, p. 101; STEJNEGER, Proc. U. S. Nat. Mus., Vol. XXV, 1902, 
p- 158; Baitey, N. Amer. Fauna, No. 25, 1905, pp. 35, 50; Dit- 
MARS, Reptile Book, 1907, p. 440, pls. CXXIX, fig. 6, CXXX, 
fig. 4, CK XXIII, fig. 2; Srone, Proc. Acad. Nat. Sci. Phila., 1911, 
p- 232; Van DensurcH & Stevin, Proc. Cal. Acad. Sci., Ser. 4, 
Vol. 3, 1913, p- 426, pls. XVII, XXV, fig. 1; Srrecker, Baylor 
Bulletin, Vol. XVIII, No. 4, 1915, p. 43; STEJNEGER & Barsour, 
Check List N. Amer. Amph. Rept., 1917, p. 110; Vorures, Univ. 
Ariz. Agric. Exper. Station Bull. No. 83, 1917, p. 359, pl. I, fig. 2. 
Crotalus ornatus HALLOWELL, Proc. Acad. Nat. Sci. Phila., 1854, p. 192 
(type locality, Pecos River, between El Paso and San An- 
tonio, Texas); Hattowe 1, Rep. Pac. R. R. Surv., Vol. X, 1859, 
p- 23, pl. I]; Core, Proc. Acad. Nat. Sci. Phila., 1859, p. 338. 
Caudisona molossus Cope, in Mitchell’s Research. Venom Rattles., 
1861, p. 124; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 308; 
Coves, Surv. W. rooth Merid., Vol. V, 1875, p. 605. 
Crotalus durissus var. molossus Garman, Mem. Mus. Compr. Zool. 
Cambr., Vol. VIII, No. 3, 1883, p. 171. 
Crotalus terrificus BoULENGER, Cat. Snakes Brit. Mus., Vol. III, 1896, 
P- 573 (part). 
