640 Bulletin Ame 



■ Number 

 Locality 

 Sex 



Length 

 Tail 



Length of Head 

 Breadth of Head 

 Hind Leg 

 Tibia 



Key to Distinguish the Species of Crotaphytus in Lower California 

 Interorbital scales in two rows; a series of subequal suboculars. C. collaris baileyi. 

 Interorbital scales in three or four series, a single much enlarged subocular. 



C. wislisenii. 



Sauromalus ater Dumeril 

 Plate L,- Figure 3 

 Sauromalus ater DtjmIsril, 1856, p. 536, PI. xxm, fig. 3. 

 Sauromalus sp. Stejneger, 18916, p. 411. 

 Sauromalus interbrachialis Dickerson, 1919, p. 463 ' 



Range. — Lower California, north to the island Espiritu Santo, off La Paz. 

 Lower Californian Records. — Island of Espiritu Santo, Stejneger, 1891, p. 411 . 



Two specimens of Sauromalus from La Paz are included in the 

 collections of the Albatross Expedition. These are possibly from the 

 island of Espiritu Santo, off La Paz, like the specimen recorded by 

 Yarrow and Stejneger. 



In defining Sauromalus hispidus in 1891, Stejneger remarked the 

 discrepancy between the Sauromalus ater of California and Arizona and 

 the single immature specimen from Lower California. With two addi- 

 tional specimens from the same locality, I believe the recognition of a 

 distinct species is fully warranted. Mr. Charles L. Camp has pointed 

 out to me the fact that it is highly improbable that the type of S. ater 

 Dumeril, collected by Lieut. Jaures during the circumnavigating voyage 

 of the frigate Danaide, and presented without locality to the Museum 

 d'Histoire Naturelle in Paris, could have been collected in California or 

 Arizona, since Sauromalus does not reach the coast of California. With 

 this in mind, I applied to Professor Louis Roule, of the Museum d'His- 

 toire Naturelle in Paris, for information regarding the type of ater, and 

 he has very kindly supplied me with an excellent photograph of the 

 Ventral aspect of the type. The ventral scales from anus to gular fold 

 number about 135, compared with a range of 160-182 in the California 



'Type: U. S. N. M. No. 64448 



