VOL. XVI, pp. 73-78 MAY 29, 1903 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



EIGHT NEW MAMMALS FROM THE UNITED STATES. 

 BY C. HART MERRIAM. 



Among the recent additions to the mammal collection of the 

 Biological Survey are a cougar from the desert region border 

 ing the Lower Colorado, below Yuma, Arizona, presented by 

 Herbert Brown; and a large gray fox from New Hampshire, 

 presented by Abbott H. Thayer. Both of these animals appear 

 to be new. In publishing brief diagnoses of them, the oppor 

 tunity is taken to describe several other unnamed mammals that 

 have been for some years in the collection of the Biological 

 Survey. 



Felis aztecus browni subsp. nov. 



Type from Lower Colorado River 12 miles south of Yuma, Arizona. 

 No. 125,719 $ ad., U. S. National Museum, Biological Survey Collection. 

 February, 1903. Collected by Herbert Brown. 



Characters. Similar to aztecus but slightly smaller and paler, with 

 much smaller and lower audital bullae, and smaller lateral teeth, partic 

 ularly the canines and carnassials. The incisors are the same size as in 

 aztecus, but the canines are much more slender, and the premolars (ex 

 cept the rudimentary upper one) and carnassials are very much smaller. 

 The upper carnassial measures only 20.5 mm., while in aztecus of the 

 same sex ( $ ) it measures 24 mm. The bullse are essentially of the same 

 length as in aztecus but are narrow and low, lacking the usual inflation. 

 21 PBOC. BIOL. Soc. WASH. VOL. XVI, 1903. (73) 



