1897.] NATURAL SCIENCES OF PHILADELPHIA. 461 



two specimens (C. A. S. 351, 852) caught by Captain Wm, Lund on 

 the Tres Marias. Dr. Jordan's party found the species at Mazatlan. 



5. Iguana igvana rhinolopha (Wiegin.). 



Three specimens were obtained at Mazatlan, Sinaloa, and four 

 (C. A. S., 3,339-3,342) at San Bias, Jalisco. 



6. Ctenosaura teres (Harlan). 



This species is more numerously represented, both in the Stanford 

 University collection and in that belonging to the California Acade- 

 my, than any other species. These specimens were shot at Mazatlan, 

 Tepic and San Bias. Many of these specimens are very large and 

 have dorsal crests so well developed that I have no hesitation in 

 abandoning Cope's brachyloj)ha as a name for them, although I 

 have seen no specimens from near the type locality of Harlan's 

 Cyclura teres. It well may be that western specimens differ from 

 the typical form, but until some better character has been found to 

 separate them I cannot recognize them as distinct. 



7. Crotaphytus baileyi Stejn. 



One specimen was brought back from Hermosillo, Sonora. 



8. Callisaurus ventralis 'Hallow). 



A Gridiron-tailed Lizard (C. A. S., No. 3,390) taken at Mazatlan, 

 Sinaloa, in October, appears to be identical with Californian and 

 Arizonan examples of this species. Its femoral pores, however, are 

 only ten instead of from fourteen to eighteen. This locality is much 

 farther south than any at which this lizard had previously been 

 found. The species was found also at San Miguel de Horcasitas, 

 Sonora, in May, 1892. 



9. Holbrookia maculata approximans (Baird). 



A typical specimen of this subspecies was caught at Duras Nillas, 

 Sonora, in May, 1892. Several young from Mazatlan, January 25, 

 1895, are also referred to this form, although their snouts appear to 

 be more pointed than those of Arizonan examples. 



10. TJta ornata B. & G. 



This lizard was obtained in Sonora at San Miguel de Horcasitas, 

 in April, and at Duras Nillas, in May, 1892. 



11. Sceloporus utiformis Cope. 



Numerous specimens of this Sceloporus were shot at Tepic, Jalisco, 

 in October. 



