930 16. CROTALIDE 
snake occupies the area bounded in the East by the ninety- 
sixth meridian and the Upper Missouri Valley; by the main 
divide of the Rocky Mountains in the West; by the thirty- 
third parallel in Texas and the Mexican boundary further 
west in the South; and by the fiftieth parallel in the north. 
Although the main divide of the Rocky Mountains in this 
northern region seems to be the limit of its extention to the 
west, yet in at least one place where there is no high crest to 
obstruct its passage across, it has been found on the western 
slope, viz.; at Lemhi, Idaho.”* It has not been taken in 
Nevada, nor in any of the Pacific States. Specimens have 
been recorded from a number of localities in Arizona, as, 
Cave Creek, Maricopa County, Wilcox, Cochise County, 
Apache, Navajo County, Camp Grant, Graham County, and 
Fort Buchanan, Santa Cruz County. 
Remarks.—The Arizonan specimens which I have seen 
are not really typical Crotalus confluentus. Nevertheless they 
seem to be more like that species than like Arizonan speci- 
mens of C. oreganus. It is possible that they are merely 
abnormal individuals of the latter species, but until more 
specimens have been secured it seems best to continue to re- 
gard them as C. confluentus. 
214. Crotalus oreganus Holbrook 
PaciFic RATTLESNAKE 
Plates 98, 101, 102, 111, and 112 
Crotalus oreganus Hoitsproox, N. Amer. Herpet., Ed. 1, Vol. 4, 1840, 
p- 115, pl. 29 [= XXIV] (type locality, banks of the Oregon or 
Columbia River); Gii1, Science, Ser. 2, Vol. 17, 1903, p. 910; 
GrInNELL & Camp, Univ. Cal. Publ. Zool., Vol. 17, No. 10, 
1917, p- 194; Cowes, Journ. Entomol. & Zool., Pomona College, 
Vol. XII, No. 3, 1920, p. 66; SrepHens, Trans. San Diego Soc. 
Nat. Hist., Vol. III, No. 4, 1921, p. 65; Van DensurcH & SLEVIN, 
*Stejneger, Report U. S. Nat. Mus. for 1893. 
