74 Merriam — New Mammals from the United States. 



They measure in transverse diameter, from meatus to front of foramen 

 lacerum posticus, only 16 mm., while those of aztecus usually measure 

 20 mm. or more. The difference in height is equally striking. In color 

 the animal is very much paler and grayer (less red) than aztecus. 



Remarks. — The small size of the bulla? seems to indicate that the Colo- 

 rado Desert Cougar finds his prey more by sight than hearing; and the 

 slender canines and small lateral teeth indicate that he preys on smaller 

 animals than the deer-killing Cougar of the uplands. 



Measurements (in flesh). — "Tip of nose to tip of tail 7 ft. 4 in.; tail2Si in. 

 Weight 170 pounds." 



Urocyon cinereoargenteus borealis subsp. nov. 



Type from Marlboro, 7 miles from Monadnock, New Hampshire. No. 

 119,725 $ ad., U. 8. National Museum, Biological Survey Collection. 

 November, 1902. Abbott H. Thayer. 



Characters. — Similar to cinereoargenteus but decidedly larger, with 

 marked skull and tooth differences. Skull larger and heavier; nasals 

 longer and more slender posteriorly; palate broader; pterygoid fossa 

 much broader, with sides more flaring (less vertical); teeth (particularly 

 the upper molars and last lower premolar, pm T ) slightly larger and de- 

 cidedly thicker; last upper molar conspicuously larger (outer side 10 mm.), 

 with heel broader and heavier. The 4th lower premolar is larger than 

 in any known member of the genus. 



Cranial measurements. — (Type specimen $ ad.): Basal length 126; 

 basilar length of Hensel 118.5; zygomatic breadth 73; palatal length 63; 

 postpalatal length 55; front of canine to back of last upper molar 56. 



Urocyon catalinae sp. nov. 



Type from Catalina Island, Santa Barbara Islands, California. No. 

 45,228 $ ad., U. S. National Museum, Biological Survey Collection. 



Geographic distribution. — Catalina Island, California. 



Characters. — Similar to littoralis, but tail much longer, throat purer 

 white; white of underside of thigh and upper side of hind foot greatly 

 restricted; dusky patch at base of whiskers well defined. 



Cranial characters. — Skull similar to that of littoralis, but nasals nar- 

 rower and not constricted in the middle; rostrum longer and more slen- 

 der; anterior ascending arm of jugal thicker; bullae more inflated and 

 less flattened anteriorly. Urocyon catalina} agrees with littoralis and 

 differs from all the others in having the nasals broad posteriorly and 

 obliquely truncate, and the frontal spines short. 



Ifeasurements.— Male: Total length 795; tail 298; hind foot 112. 

 Female: total length 720; tail 270; hind foot 112. Two specimens 

 weighed in the flesh: $ 5 lbs. ; 9 4^ lbs. 



