38 CALIFORNIA ACADEMY OF SCIENCES rPROC. 4th Ser. 



of Nye County, July 20, 1913. The other twenty-two were 

 collected at Elko, Elko County, July 14-16, 1913, and July 19, 

 1916. These snakes all show the typical coloration in which 

 the lateral lines are absent, the dorsal line indistinct, and the 

 dark markings on the gastrosteges less evident than in typical 

 specimens. The Elko specimens had been eating larvae of 

 Rana pipiens. 



40. Thamnophis ordinoides couchii (Kennicott) 



A single specimen (No. 37999) from Glenbrook, Lake 

 Tahoe, was referred to this subspecies. The lateral lines are 

 absent, the dorsal line indistinct, and the dark markings on the 

 gastrosteges less evident than in T. o. vagrans. This specimen 

 is a female. 



41. Sonora semiannulata Baird & Girard 



One specimen (No. 37508) was found just before dark, 

 crawling over the surface of the desert near Rhyolite, Nye 

 County, August 3-9, 1913. Its scales are in 15 rows, gastro- 

 steges 171, urosteges 48, supralabials 7-7, infralabials 6-6, 

 preocular 1-1, postoculars 2-2, loreal 1-1, temporals 1+2-1+2. 



There are 27 black bars on the body and nine black rings on 

 the tail. The entire dorsal region between the black bars is 

 pinkish orange, increasing in intensity toward the tail, on which 

 it is bright orange. The lateral regions are yellowish white, 

 but many of the lateral scales show central or basal black spots. 

 This specimen agrees in coloration with No. 17550 from Cave 

 Creek, Maricopa County, Arizona, except in the number of its 

 dark cross-bars. 



42. Crotalus oreganus Holbrook 



One male rattlesnake (No. 37997) was sent to us by Mr. R. 

 L. Kennedy, who caught it near Lamoille, Elko County, June 

 10, 1913. It is typical in coloration. The scales are in 23 

 rows, gastrosteges 180, urosteges 20, supralabials 15-14, infra- 

 labials 15-16, preoculars 2-2, postoculars 3-3, loreal 1-1. 



A second specimen was secured on Anaho Island, Pyramid 

 Lake, Washoe County, Nevada, where the species is said to 

 be common. 



