278 PROCEEDINGS OF THE ACADEMY OF [1899. 



9.4 aud 9,2. lu the type of U. fratereulus it is 11. The second 

 and third premolars in U. fratercndus are long and crowded, while 

 in U. jmrvidens they are narrow and widely spaced. The height 

 is about the same in each. The length of each of these teeth 

 including cingulum equals or exceeds the height in U. fratereulus, 

 but is much less than the height in U. parvidens. In this respect 

 U. parvidens resembles the members of the cineveoargenteus group. 

 In the mandibular teeth the differences are of the same kind, but 

 somewhat less defined. Length of first l(»ver molar 9.2 in JJ. pjar- 

 videns, 10.6 in U. fratereulus. 



Measurements. — Type:^ Total length, 720; tail vertebra^ 240; 

 hind foot, 95; ear from meatus, 51; ear from crown, 46. Aver- 

 age of four specimens including the type: Total length, 722; tail 

 vertebrae, 222; hind foot, 93; ear from meatus, 50; ear from 

 crown, 46 (all from dry specimens). 



Speeimens examined. — Four, all from the type locality. 



General remarks. — Urocyon fratereulus and U. p)o.rvidens form a 

 group readily distinguishable from the relatives of U. cinereoar- 

 genteus by their slender feet and relatively larger and more inflated 

 audital bullae. The bullae in these small skulls are much larger 

 than in members of the cinereoargenteus group of approximately 

 the same size, aud fully equal to those of the largest forms. The}' 

 are more abruptly elevated above lev^el of basioccipital (Avhen skull 

 is held upside down) and the outer anterior face slopes away much 

 more abruptly. They are placed more closely together than in the 

 members of the cinereoargenteus group. In a specimen of U. 

 littoralis, only 193 in greatest length, the space between the bullae 

 is 8.4, aud in the other forms this relative spacing is maintained. 



Urocyon guatemalae sp. nov. 



Type adult d (skin and skull), No, 76,723, United States 

 National Museum (Biological Survey Collection), collected at 

 Nenton, Guatemala, December 16, 1895, by E, W. Nelson and 

 E, A. Goldman. Original number 8,801. 



General characters. — Most like Urocyon littoralis Baird from the 

 Santa Barbara Islands, California, but color darker and richer. 

 Carnassial tooth more robust than in U. littoralis. Audital bullae 



■^ Tlie type of U. fratereulus measures : total length, 750 ; tail vertebrje, 

 290 ; hind foot, 95 (from skin). 



