224 Bulletin American Museum of Natural History. [Vol. XXII, 



The principal measurements of 4 male skulls and 3 female skulls 

 are as follows: 



There is another specimen collected by Mr. Batty at Escuinapa in 

 December, 1895. The winter skins have a very full, heavy pelage, 

 the coarse, long, black-tipped hairs of the upper surface giving a 

 decidedly blackish appearance to the greater part of the dorsal 

 region. The back of the ears, fore legs, and posterior surface of 

 hind limbs are deep rusty red. In summer skins the pelage is greatly 

 worn, the black-tipped hairs having mostly fallen out or been worn 

 off, leaving the prevailing color strongly fulvous, with the nose, 

 nape, and limbs rich rusty fulvous. 



The contrast in coloration between this species and C. impavidus 

 of northern Durango is striking at all seasons. The later species 

 is also rather smaller than C. vigilis, with weaker dentition, and 

 especially smaller carnassials. 



25. Urocyon cinereoargenteus scotti (M earns). 



Eleven specimens: Rosario, i specimen, Dec. 21; Escuinapa, 9 

 specimens, Jan. 6, March n, April 12, May i, June 9; Papachal, 

 i specimen, Dec. 7. 



The series consists of middle-aged adults, except two very old 

 males, one of which greatly exceeds all the other males in external 

 measurements, and has also the largest skull. 



Collector's measurements: 5 adult males, total length, 981 (927 

 1067); head and body, 566 (559-584) ; tail vertebrae, 415 (368-483); 

 hind foot without claws, 125 (121-133); ear from notch, 71 (67-76): 

 4 females, 931 (927-947), 550 (546-559), 381 (368-394), 121 (114-127), 

 71 (70-76). 



