Occasional Papers of the Museum of Zoology 3 



N. M. 8002, from Camp Grant, Arizona, has a pattern some- 

 what similar to elegans ; U. S. N. M. 14298 from Chihuahua, 

 Mexico, has the pattern of elegans and the dorsal scale formula 

 of occidentalis ; the specimen from IMesilla Valley, New ]\Iexico, 

 is intermediate, as well as four others of indefinite locality 

 (A. M. N. H. 4268, 4269, and U. S. N. M. 44904, 48696). 

 The two subspecies may be distinguished as follows : 



Scale rows usually 29 or 31; dorsal blotches on body about 55 (40 to 

 57) large and squarish, covering about 12 or 13 lateral rows of scales 

 and 2 to 3 longitudinal rows, and separated by 1 to IV2 scales; lateral 

 spots conspicuous and roundish; tail 0.138 to 0.159 of total length. 



A. elegans elegans (Kennicott). 



(From about the 9Sth meridian in Texas, west through northeastern 

 Mexico and New Mexico into southeastern Arizona. 



Scale rows 27, only occasionally 29; dorsal blotches on body about 60 

 (54 to 77), narrow, covering about 7 to 10 lateral rows and 1% to 2 

 longitudinal rows of scales, and separated by about 2 scale lengths; 

 lateral spots narrow or indistinct; tail 0.100 to 0.148 of total length. 



A. elegans occidentalis, new subspecies. 



(Southeastern Arizona west through southern California and northern 

 Lower California.) 



Scale features may be compared in the accompanying lists 

 of specimens. 



