68 



NORTH AMERICAN FAUNA. 



collected which is peculiar to these islands. The species has been 

 recorded from the mainland (by Van Denburgh, Proc. Phila. Acad., 1897, 

 p. 463, who identifies "a large number of lizards from Mazatlau, Sau 

 Bias, and Tepic" with Giiuther's species), but I am satisfied that these 

 records are based upon specimens of G. f/ularis me.ricanuH (Peters) 

 which superficially very much resemble the island species. The mis- 

 identification is probably due to the fact that Cope, in his monograph 

 of the genus, overlooked the different keeling of the caudal scales 

 which is the essential character of this species. 



List of specimens of Cnemidophorus mariarum. 



V. S. Na. 



tional 

 Museum 

 number. 



Collect- 

 ors' num- 

 ber. 



Locality. 



Date. 



24652 

 24653 

 24654 

 24655 

 24656 

 24657 

 24658 

 24659 

 24660 

 24661 

 24662 

 24663 

 24664 

 24665 

 24666 



637 

 638 

 639 

 640 

 644 

 645 

 646 

 647 

 687 

 701 

 702 

 703 

 704 

 705 

 706 



Maria Madre Island. 

 do 



do. 



do. 

 .do. 

 .do. 

 .do. 

 .do. 



Maria Magdalena Island 



Mai'ia Cloofa Island (outlying rock) . 



do 



do 



do 



do 



Maria Cleofa Island (main isl.aud)... 



Cnemidophorus gularis mexicanus (Peters). 



The Isabel Island swifts are identical with the mainland form, two 

 specimens of which were brought from San Bias. They are quite dis- 

 tinct from the species on the Tres Marias, which is well characterized 

 by the smaller femorals and the parallel caudals. It is strange that 

 Cope, having had the latter character clearly pointed out by Boulenger, 

 should have referred G. mariarum to G. (/Hlaris as a subspecies. 



List of specimens of Cnemidophorus gularis mexicanus 



