Revision of tJte Coyotes. 33 



adult female from same place measures : basal length, 171 ; basilar length 

 of Hensel, 107; zygomatic breadth, 94; palatal length, 90; mastoid 

 breadth, 59; length of crown of upper carnassial tooth, IS. 



Canis vigilis sp. nov. 



Type locality. Manzanillo, Colima, Mexico. Type No. Hill, 9 young 

 adult, U. S. National Museum, Department of Agriculture collection. 

 Collected February 6, 1892, by E. W. Nelson. Original No. 1840. 



Characters. Similar to C. peninsulse, but darker and more highly col 

 ored, with more black on forearm and no black on under side of tail ex 

 cept at tip ; upper carnassial and first molar much smaller. 



Color. Muzzle dull cinnamon rufous; top of head grizzled buffy ful 

 vous and black; ears fulvous, upper parts buffy-ochraceous, profusely 

 mixed with black (under fur fulvous) ; under parts strongly suffused with 

 pale fulvous; throat collar with black tips strongly marked; fore and 

 hind legs fulvous, as in ochropus, but deeper, especially on fore feet ; black 

 on upper side of forearm more extensive ; outer side of thigh and leg 

 strongly intermixed with black-tipped hairs, which reach down to or 

 below knee ; under side of tail dull pale fulvous, whitish basally, and 

 tipped with black (hairs of under side anterior to black tip not tipped 

 with black). 



Cranial and dental characters. The skull of the type specimen of Canis 

 vigilis, a young adult female, agrees in general characters with an adult 

 female pemnsuLr, from Cape St. Lucas, but is somewhat larger, with 

 slightly broader rostrum and longer and more slender mandible. The 

 upper carnassial and molar teeth, however, are very much smaller and 

 show that the two animals belong to different sections of the group. Com 

 pared with Canis mearnsi, its nearest neighbor on the north, C. vigilis has 

 a larger skull and very much smaller teeth, particularly the upper car 

 nassial and first molar. The first upper molar is decidedly smaller than 

 in any known form except C. microdon, from which it differs in being 

 deeply notched posteriorly. 



Measurements. Type specimen, 9 young adult: total length, 1155; tail 

 vertebrae, 335 ; hind foot, 190. 



Cranial measurements. Type specimen : basal length, 166 ; basilar length 

 of Hensel, 163; zygomatic breadth, 87; palatal length, 85; mastoid 

 breadth, 59; length of crown of upper carnassial tooth, 17.5. 



