REPTILES OF THE TRES MARIAS ISLANDS. 



67 



Sceloporus boulengeri Stejneger. 

 N. Am. Fauna No. 7, 1893, ji. 180, pi. I, ligs. ria-e. 



Tills .species appears to be smaller than »S'. clarMi, of wliicb it is the 

 soutlieni representative. A fiill-growii male (No. G'S-ie) measures only 

 72""" from snout to vent. 



Van ])enburgh's belief that S. boulcnficri "is the same form as Cope's 

 8. (iliiioporuf!^'' (Proc. Phila. Acad., 1S',)7, p. 4:(!3) is not well founded. The 

 latter is easily distinguished by having only 2 to 3 femoral pores, besides 

 other difl'erenees. It is probably identical with iS'. horridus. 



C'nemidophoius mariarum Giinther. 



CntmUlophonis mariarum Giinther BU>1. Ci iit.-Ain., Rept. p. 38, jil. XX, April, 1885; 

 Boiilenger, Cat. Lizards, Brit. Mus., p. 368, 1S,S5. 



The swifts from the Tres Marias are essentially alike. Tho.se from 

 Maria Madre are the largest and possibly also most distinctly marked ; 

 those from the small detached rock ott' the west side of Maria Cleol'a 

 as well as the one from the main island of that name are somewhat 

 smaller. According to Mr. Nelson's observation those from the detached 

 islet, which is a bare rock, the nesting place of numerous sea birds, 

 a])peared to him paler when alive than those on the other islands, but 

 now, in alcohol, the difference, if any, is very .slight. 



This species, which was originally described by Giiuther from speci- 

 mens collected by Forrer on the Tres Marias seems to be confined to 

 this group of islands. If so, it is the only species of reptile hitherto 



