MAMMALS .OF THE MEXICAN BOUNDARY. 161 



Tayansu aiiynltttuin, JIilleb and Rehn, Proc. Bowt. Soc. N. H., XXX. 



No. ], Dee. 27, 1901, p- 12 (Syst. Results Study X. Am. Mam. to 



close of 1900). 

 Tagassu angulatum, Elliot, Field Col. Mus., Zool. Sev., lY, Ft. 1, 1904, 



p. 63, pis. XXV, XXVI (Mam. Mid. Am.). 



. Type-specimenH. — One from the Guadalupe River, two from the 

 Llano River, and two from a tributary of the Red River, Texas. 



Geographical range. — Tropical and Sonoran zones of the Texan 

 and Tamaulipan regions. 



Description. — Form, pig-like. TaU, abortive. Toes, 4-3. A large 

 scent gland occupies the upper part of the rump. Color above black, 

 mixed with soiled grayish white annulations to the bristles. An 

 erectile mane of long black bristles extends from the occiput to tlie 

 scent gland on the rump ; and an incomplete whitish '' collar " crosses 

 tlie hind part of the neck, extending obliquely upward and backward 

 from in front of the shoulder to the black mane 

 on the back. The ears are blackish externally 

 and grayish internally where the long hairs are 

 arranged in five separate lines, which are narrow 

 at base, broadening towards the tip, which they 

 fail to reach. The muzzle, cheeks, and under 

 side of head are lighter in color than the back, 

 having a large admixture of brownish gray an- 

 nuli to the bristles. The under surface is reddish " 



. ,, , . /. T ■ , Fig. 3.— Tayas-su angu- 



black mesialiy, this color fading to brownish gray latum, a, eight foee- 

 on the axillae and hollows of thighs. The limbs ™™; ''• '''™'' '''*'°- 



^^ "FOOT 



are blackish at the hoofs (fig. 3), becoming paler 

 above as the light rings of the bristles increase in width. 



The young when newly born are plain yellowish gray on limbs and 

 under parts ; above, brownish yellow mixed with black, with a black 

 vertebral stripe extending from the occiput to the gland on the rump ; 

 tip of ear dusky. Sometimes the shade of coloring is decidedly red- 

 dish in young peccaries. In growing older the black vertebral stripe 

 grows less conspicuous, as black gradually becomes the predominant 

 color of the upper surface : but the collar and pale «.nnuli do not lose 

 their reddish shade until the animal has nearly grown to mature size. 



Cranial and dental characters. — From Tayassu tajacu (Linnseus) 

 it differs in having the molar crests continued forward to base of 

 canine alveolus instead of terminatng above the infraorbital foramen ; 

 nasal bones pinched or angulate on the middle line instead of rounded 

 in cross section; first (fourth of the old works) superior premolar 

 quadritubercular, with intermediate tubercles, and quadrate in out- 

 line, molariform instead of tritubercular or rounded in outline, pre- 

 molariform ; molars wrinkled in angulatum, not so in tajacu. 

 30639— No. 56—07 M 11 



