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Bulletin American Museum, of Natural History 



[Vol. XL VI 



tinguished from C. punctilinealis Dickerson from Tiburon Island by the 

 much longer head and neck, and the smaller size. The scales of the under 

 surface of the forearm are not notably different from those of puncti- 

 linealis. The femoral pores number 22-23. 



The differences cited in the original description to distinguish este- 

 banensis from melanostethus are inadequate, and I am unable to find 

 other characters of greater weight. The coloration appears to be prac- 

 tically identical. I have, nevertheless, retained C. estebanensis in the 

 present list, as it is not improbable that the examination of series of 

 specimens will justify its retention as an insular race. On the other hand, 

 the examination of adequate material of this form and its near relatives 

 on the neighboring islands may quite as probably disprove their sup- 

 posed distinctness. 



Fig. 12. Stages in the development of the color pattern of Cnemidophorus punctilinealis Dicker- 

 son. A, U. S. N. M. No 64460: B, A. M. N. H. No. 5.539; C, A. M. N. H. No. 5533; D, (type), 

 U. S. N. M. No. 64447. .4 and B, dorsal views; C and D, lateral views. 



Cnemidophorus punctilinealis Dickerson 



Cnemidophorus punctilinealis Dickerson, 1919, p. 475. ' 



Range. — Tiburon Island, Gulf of California; coastal strip of Sonora (?). 



The specimens described under this name by Dickerson apparently 

 represent a fairly distinct race of C. melanostethus, the dorsal coloration 

 being more nearly that of C. tessellatus tessellatus, the ventral of C. 

 melanostethus. This is exactly the coloration described by Van Denburgh 

 and Slevin in specimens from Isla Partida, near Angel de la Guardia 

 Island, as C. dickersonse; a paratype of this species, in the collection of 

 The American Museum of Natural History, is more nearly allied in color 

 pattern to adult C. disparilis. 



'Type: U. S. N. M. No. 64447. Paratypes: U. S. N. M. Nos. 64456-60, A. M. N. H. Nos. 5533-39. 



