﻿REPl'ILES OF THE TRES MARIAS ISLANDS. 



67 



U. S. -Na- 

 tional 

 Museum 



Tl llTTil)ftT. 



Collect- 

 ors ' 11 um - 

 ber. 





24634 



635 



Maria 



24635 



642 



do 



24636 



643 



, ..do 



24637 



653 



.... do 



24638 



670 



do 



24639 



671 



do 



24640 



672 



do 



24641 



673 



do 



24642 



674 



do 



24643 



675 



- do 



24644 



678 



do 



24645 



679 



do 



Locality. 



Date. 



May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 

 May 



3, 1897 

 4, 1897 

 7,1897 

 13, 1897 

 21, 1897 

 21, 1897 

 21, 1897 

 21, 1897 

 21, 1897 

 21, 1897 

 25,1897 

 25, 1897 



Sceloporus boulengeri Stejneger. 

 N. Am. Fauna No. 7, 1893, p. 180, pi. I, figs. 5a-c. 



This species appears to be smaller than ^S'. clarMi, of which it is the 

 southern representative. A full-grown male (No. 6346;) measures only 

 72™°^ from snout to vent. 



Yan Denburgh's belief that S. houlengeri ''is the same form as Cope's 

 8. oUgoporus^^ (Proc. Phila. Acad., 1897, p. 463) is not well founded. The 

 latter is easily distinguished by liaviu^i: only 2 to 3 femoral pores, besides 

 other differences. It is probably identical with iS. horridus. 



U. S. Na- 

 tional 

 Museum 

 number. 



Collect- 

 ors' num- 

 ber. 



Locality. 



Sex. 



Number 

 of pores. 



Date. 



24646 

 24647 

 24648 

 24649 

 24650 

 24651 



634 

 634 a 

 634 Z; 

 634 c 

 634 (Z 

 634 e 



do 



cT ad.... 

 ? jun... 

 cT adol.. 

 ? ad.... 



? 



8 

 9 

 7 

 9 

 9 

 9 



Apr. 23,1897 

 Apr. 23,1897 

 Apr. 23,1897 

 Apr. 23,1897 

 Apr. 23,1897 

 Apr. 23,1897 



do 



do 



do 



do 



d" ad..-. 





Cnemidophorus mariarum Giinther. 



Cnemidophorns mariarum Giinther Biol. Cent. -Am., Rept. p. 28, pi. XX, April, 1885; 

 Boulenger, Cat. Lizards, Brit. Mus., p. 368, 1885. 



The swifts from the Tres Marias are essentially alike. Those from 

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

 those from the small detached rock oft* the west side of Maria Oleofa 

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

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

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

 appeared 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 Giinther 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 



