928 16. CROTALIDE 
Caudisona lecontei Core, in Mitchell’s Research. Venom. Rattlesn., 
1861, p. 121; Haypen, Geol. Nat. Hist. Upp. Missouri, 1862, p. 
177: 
Caudisona confiuenta Core, in Mitchell’s Research. Venom Rattlesn., 
1861, p. 122; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 309; 
Core, Ann. Rep. U. S. Geol. Surv. Terrs., 1871 (1872), p. 476; 
ALLEN, Proc. Boston Soc. Nat. Hist., Vol. XVII, 1874, p. 69; 
Coves, Surv. W. rooth Merid., Vol. V, 1875, p. 604. 
Crotalus durissus Wiep, Verz. Rept. Reisse Nord. Amer., 1865, p. 65, 
pl. VII, figs. 1-3. 
Caudisona confluenta lecontei Core, Proc. Acad. Nat. Sci. Phila., 1886, 
Pp- 307. 
Crotalus adamanteus atrox Yarrow, Surv. W. tooth Merid., Vol. V, 
1875, p. 529. 
? Crotalus lucifer Yarrow, Surv. W. tooth Merid., Vol. V, 1875, p. 
529. 
Crotalus confluentus confluentus Cope, Proc. Acad. Nat. Sci. Phila., 1883, 
p- 11; Cope, Proc. Acad. Nat. Sci. Phila., 1892, p. 336; Core, 
Proc. U. S. Nat. Mus., Vel. XIV, 1892, p. 692; Taytor, Amer. 
Naturalist, Vol. XXVI, 1892, p. 752; Cope, Report U. S. Nat. 
Mus. for 1898, 1900, p. 1170, fig. 336 (part). 
Crotalus confluentus pulverulentus Cope, Proc. Acad. Nat. Sci. Phila., 
1883, p. 11 (type locality, vicinity Lake Valley, New Mexico); 
Core, Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. 692; Cope, Re- 
port U. S. Nat. Mus. for 1898, 1g00, p. 1174, fig. 337. 
Description—Moderate. Head broad, flat-topped, vary- 
ing in outline according to position of fangs, etc. Rostral 
much higher than wide, in contact with anterior nasal. Two 
nasals. Usually two preoculars and four internasals. A 
large scale just in front of supraocular and occasionally large 
scales on prefrontal region. Supraocular large but not raised 
into a horn-like process;* separated from its fellow by from 
three to six irregular rows of scales. Fourteen to seven- 
teen superior and a similar number of inferior labials; 
first pair of latter meeting in front of single pair of 
genials. Two to four rows of scales between supralabials 
*Garman mentions a specimen with horn-like supraocular. 
