1922] Schmidt, Amphibian* and Reptile* of Lower California 639 



The single specimen in the collection is a gravid female, consider- 

 ably injured in collecting. The stomach contents consist of a ground 

 beetle, a large wasp, and the tail of a lizard. 



I have compared the type with a series of nineteen C. collaris baileyi 

 in The American Museum of Natural History. In these, the average 

 proportion of hind leg to body length is .87, while in the present speci- 

 men it is 1.04. The tail length in the series of C. c. baileyi averages .66 

 of the total, .70 in the type of C. dickersonx. 



It is possible that this species will be found to extend on the Mexi- 

 can mainland and that it will ultimately be referred to a subspecific 

 rank under C. collaris, occupying the southern portion of the range of the 

 species on the western coast of Mexico. 



Crotaphytus insularis Van Denburgh and Slevin 



Crotaphytus insularis Van Denburgh and Slevin, 1921?), p. 96. 

 Range. — Angel de la Guardia Island. 



Crotaphytus wislizenii Baird and Girard 



Crotaphytus wislizenii Baird and Girard, 18526, p. 340, PI. in; Stejneger and 



Barbour, 1917, p. 46. 

 Crotaphytus copeii Yarrow, 1882a, p. 441; Stejneger and Barbour, 1917, p. 45. 



Range. — Idaho, the Great Basin, southward into Mexico, southern California 

 and Lower California. 



Lower Californian Records. — La Paz ; Yarrow, 1882a, p. 441; Magdalena 

 Island, Van Denburgh, 1895, p. 93; San Tomas, 1896, p. 1004; San Quentin, Meek, 

 1905, p. 8; Cedros Island, Van Denburgh and Slevin, 1914, p. 144; Tiburon Island, 

 Dickerson, 1917, p. 96. 



Specimens in the Biological Survey collection come from Ensenada 

 (U. S. N. M. No. 37629) and Yubay (37630). The record from Ensenada 

 extends the range of this species northward on the Pacific coast of Lower 

 California, the nearest previous record being Santo Tomas. The record 

 from Yubay, in the central part of the peninsula, fills a gap in the known 

 distribution, connecting the Cedros Island record with those to the north 

 and south. 



I have followed Van Denburgh (1905, p. 25) in regarding the Lower 

 Californian Crotaphytus of this type as C. wislizenii. The specimens 

 secured by the Albatross Expedition in 1911, one each on Cedros and 

 Tiburon Islands, are certainly insufficient to establish the validity of 

 C. copeii, much less of insular races, in view of the great variability of 

 typical wislizenii. Larger series from the peninsula may reestablish C. 

 copeii, and I append the measurements of the two insular specimens 

 for reference. 



