MAMMALS OF THE MEXICAN BOUNDARY. 



165 



The ]MMc,ii\ of the lower lvi<> Grande and of eastern Mexico i- a 

 smaller animal, having relatively small ears and feet (fig. 8) and a 

 blacker coloration. The coat is more dense and the bristles less 

 coarse, rigid, and crinkled than in the form here described. The 

 Texas peccary is blackish, whereas the peccary of Arizona and 

 Sonora is grayish, with a black dorsal stripe. 



Pig. 6.— t.\ y.asm angu- 

 latum sonori esse. 

 Skull, front view. 

 (Cat . No. 3 5815 

 U.S.N.M.l 



Fig. 7.— Tayassu an< d 



latum sonori ens e. 



Inner surfaceof ear. 



Cat. X" 20656 



U.S.N. M.) 



I'M,. 8, -Tayassu angulatum sonori- 

 ENSi . (Cat. No. 20657, D S.N.M.) 

 a, Right hindfoot; />, right f'ore- 



i 



A young specimen was seen alive, having been caught by a Mexican 

 ranchman on Cajon Bonito Creek, Sonora, August 25, L892, at which 

 time it was about as large as the eastern cottontail. Color, above 

 reddish brown, with a black vertebral area, beginning anteriorly a- a 

 black spot on the nape, extending thence in a line backward and 

 again broadening on the lumbar region, where it bifurcates before 

 terminating. Upper surface thickly sprinkled with black hairs ex- 

 cept in the area occupied by the "collar.** Under parts and limbs 



strongly marked as in yucatanensis, but yellowish fulvous instead of white. 

 Skull of male similar to that of male angulatus; skull of female decidedly 

 larger, with longer tooth row. In skulls young enough to show the sutures the 

 nasal bones are strongly convex posteriorly, long and slender, and only slightly 

 broader between maxillae than between premaxillae (differing markedly from 

 their condition in angulatus, in which they are very much broader between the 

 maxilla?); and the ascending or nasal arm of premaxilla is decidedly longer 

 than in angulatus. 



Remarks. — Compared with sonoriensis of Arizona, the sides are less gray, 

 the dorsal hand less sharply defined, the shoulder stripes yellower and much 

 more strongly marked. The sexual disparity in size is greater than in SOtlO- 

 riensis, the female being considerably larger than the male. 



Measurements. Type (9 ad.): Total length 960, tail 60, hind foot 21.",. 

 Skull: Basal length 203, occipitonasal length 224, zygomatic breadth ins. great- 

 est breadth across squamosals posteriorly '.»'.». palatal length 151; length of 

 upper molariforiii series 67. (<'. Hart Uerriam, Proc. Biol. Soc. Washington, 

 XIV, 1901, p. 12J. 



