928 16. C ROT A LI DM 



Caudisona lecontei Cope, in Mitchell's Research. Venom. Rattlesn., 



1861, p. 121; Havden, Geol. Nat. Hist. Upp. Missouri, 1862, p. 



177- 

 Caudisona confluenta Cope, in Mitchell's Research. Venom Rattlesn., 



1861, p. 122; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 309; 



Cope, Ann. Rep. U. S. Geol. Surv. Terrs., 1871 (1872), p. 476; 



Allen, Proc. Boston Soc. Nat. Hist., Vol. XVII, 1874, p. 69; 



CouEs, Surv. W. looth Merid., Vol. V, 1875, p. 604. 

 Crotalus durissus Wied, Verz. Rept. Reisse Nord. Amer., 1865, p. 65, 



pi. VII, figs. 1-.3. 

 Caudisona confluenta lecontei Cope, Proc. \c^A. Nat. Sci. Phila., 1886, 



P- 307- 

 Crotalus ada?nanteus atrox Yarrow, Surv. W. looth Merid., Vol. V, 



187s. P- 529- 



.? Crotalus lucijer Yarrow, Surv. \V. looth Merid., Vol. V, 1875, p. 

 529. 



Crotalus confluentus confluentus Cope, Proc. Acad. Nat. Sci. Phila., 1883, 

 p. II; Cope, Proc. Acad. Nat. Sci. Phila., 1892, p. 336; Cope, 

 Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. 692; Tavlor, Amer. 

 Naturalist, Vol. XXVI, 1892, p. 752; Cope, Report U. S. Nat. 

 Mus. for 1898, 1900, p. 1 1 70, fig. 336 (part). 



Crotalus confluentus pulverulentus Cope, Proc. Acad. Nat. Sci. Phila., 

 1883, p. II (type locality, vicinity Lake Valley, New Mexico); 

 Cope, Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. 692; Cope, Re- 

 port U. S. Nat. Mus. tor 1898, 1900, 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 nuinber 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. 



