14 FIELD COLUMBIAN MUSEUM 



and regarded it not due to age, because all specimens having the same 

 color pattern were not of equal size. 



In this connection it must be remembered that cold-blooded ani- 

 mals do not, in general, grow as uniformly as do warm-blooded ones, 

 and so two lizards of the same age may differ greatly in size. The 

 color pattern of a particular stage may also develop quite indepen- 

 dently of age. About all we can say in this connection is that one 

 particular pattern appears before another certain one does, and that 

 the earlier pattern is usually associated with the smaller individuals. 

 This genus of lizards is badly in need of careful revision, but this can 

 not be accomplished except with a large series of various ages of each 

 species. 



Specimens of this species were secured in the following localities: 

 Mesquite Valley, Beveridge Canon, Lone Pine, Keeler, Coso Valley, 

 Emigrant Canon, Furnace Creek, Wild Rose Springs, Ballarat, and 

 Lone Willow Springs, California. 



Onemidophorus stejnegeri VanDenburgh. STEJNEGER'S WHIPTAIL. 



This species much resembles the preceding, and I am inclined to 

 believe that it is only a geographical variety, but until this is proven 

 to be the case, I recognize it as a distinct species. 



Specimens were taken in the following localities: Trinidad, San 

 Matias, San Felipe, Canon Esperanza, San Antonio, Parral, Matomi, 

 Rosarito, and Aguas Escondito, Lower California. 



Verticaria sericea VanDenburgh. ORANGE-THROAT. 



A few specimens of this species were taken at San Salado, 

 Rosarito, Aguas Escondito, and San Antonio, Lower California. 



Family Colubridre. 



Chilomeniscus fasciatus Cope. BURROWING SNAKE. 



Two specimens of this species were secured, as follows: San Quen- 

 tin, Lower California, scales 13-125-25; upper labials 7 ; black rings 

 23-5; spaces between rings red in life; some of the black rings com- 

 plete though narrow on ventral surface; length of body lyomrn.; 

 tail 28mm. San Antonio, Lower California, scales 13-120-21; black 

 rings 22-5; length of body 17 5mm.; tail 23mm. 



