108 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



HETEROMYIDAE. 

 11. Heterorays gaumeri Allen and Chapman. 

 A head of this species, with skull, taken at Chichen-Itza, was preserved. 



AGOUTIDAE. 

 12- Agouti paca virgata Bangs. 

 A paca's skull was dredged from the Cenote at Chichen-Itza. 



LEPORIDAE. 



13. Lepus truii Allen. 



A female specimen, taken at Chichen-Itza, seems referable to this species. 



14. Lepus floridanus yucatanicus Miller. 

 A male was captured at Chichen-Itza. 



CANIDAE. 



15. Urocyon cinereoargenteus parvidens Miller. 



The type of this subspecies was obtained at Merida, and the specimen secured 

 by Mr. Cole at Chichen-Itza seems referable to it. Undoubtedly this is a small 

 race peculiar to the arid portion of the Yucatan peninsula. The following 

 measurements were taken from the fresh specimen: length, 740 mm.; tail, 

 281 mm. It was a female, and contained five embryos, March 6, 1904. Another 

 fox, probably of this subspecies, was seen Feb. 9, 1904, at San Ignacio. 



VESPERTILIONIDAE. 



16. Rhogeessa tumida H. Allen. 



A single female was obtained at Chichen-Itza. I have found no other pub- 

 lished records for this species from Yucatan, though its occurrence was to be 

 expected. 



MOLOSSIDAE. 



17. Molossus nigricans Miller. 



Seven specimens, all females, were taken at Chichen-Itza, where they were 

 found in the roofs of dwellings. Miller, in his original description of the 

 species, also records specimens from this locality. 



18. Nyctinomops yucatanicus Miller. 

 A single female was obtained at Chichen-Itza, the type locality of the species. 



PHYLLOSTOMATIDAB. 

 19. Otopterus pygtnaeus (Rehn). 



An adult male, captured March 5, 1904,. at Chichen-Itza, appears to be the 

 second recorded specimen of this very distinct dwarfed species. The type was 



