44 University of California Publications in Zoology [Vol. 12 



Crotalus lucifer Baird and Girard 

 Pacific Rattlesnake 



Distribution: Banning, 2200 feet, nos. 112, 126; Schain's Ranch. 

 4900 feet, nos. 270-1, 317-8, 342 (heads only of 270-1, 318) ; Straw- 

 berry Valley, 6000 feet, nos. 518, 556, 580 ; Tahquitz Valley, 8000 feet, 

 no. 579; Santa Rosa Peak, 7000 feet, no. 517; Thomas Mt, 6800 feet, 

 no. 581 ; Vallevista, 1800 feet. no. 519. 



The length of no. 579, including the rattles, was forty-five inches. 



This species ranges in both Sonoran zones and throughout the 

 Transition. The alimentary tract of no. 579 contained four undigested 

 half-grown ground squirrels. No. 318 contained an adult Neotoma. 



Crotalus cerastes Hallowed 



Sidewinder 

 While none was taken or seen, at Whitewater in 1912 reliable 

 information was given that sidewinders were frequent in that region. 



Crotalus mitchelli Cope 

 Bleached Rattlesnake 

 Distribution : Poppet Flat, 3300 feet, no. 341 ; Asbestos Spring. 

 4500 feet, no. 222. The length of no. 222 was given as thirty-five inches 

 and the girth as five inches. 



In the San Jacinto region this species was found on the lower 

 limits of Upper Sonoran. In its general range, however, it is associated 

 with desert conditions. 



Crotalus ruber (Cope) 

 Red Rattlesnake 



Distribution : Cabezon, 1700 feet, no. 139 ; Dos Palmos Spring. 

 3500 feet, nos. 225, 582-3. Reports were received in 1912 of red 

 rattlers being killed at Cabezon and Hurley Plat above Cabezon. 



No. 225 measured forty-three inches without the rattles. 



This species apparently inhabits the Lower Sonoran zone and the 

 lower margin of Upper Sonoran. 



No. 582 was reported as being extremely active when found at day- 

 light in the morning of August 23, 1908, at Dos Palmos Spring. 

 Evidently it was not chilled by the night temperature. Another very 

 active and demonstrative rattler was seen, but it retreated into a cleft 

 in the rocks, from which it could not be dislodged. 



