110 Bailey — A New Subspecies of Mountain Sheep. 



General characters. — In size and general appearance very similar to 

 Oris mexicanus, but slightly darker in coloration, with facial part of 

 skull, nasals and palate extremely narrow. 



Color. — In specimen collected September 2, upper parts, except the 

 usual large white rump patch, dull huffy brown or soiled brownish gray; 

 nose whitish; rump patch pure white with medium dark line very narrow 

 and not continuous from tail to dark area of hack; belly white posteri- 

 orly; whitish lines down inner side of hind legs to hoofs, and down front 

 leys usually only to dewclaws (in the type reaching to the hoofs). 



Cranial characters. — Skull long and narrow, with the heavy molars of 

 auduboni and mexicanus, hut different from all other species of the 

 United States and Mexico in the relatively narrow muzzle, nasals ami 

 palate in both sexes. Adult males with medium heavy pale yellowish 

 horns as in mexicanus, hut face more concave; upper molars arranged in 

 a nearly straight line. Adult female with long, thin, slender yellowish 

 horns, face less Hat and orbits more prominent than in mexicanus; upper 

 molar scries nearly straight, nasals conspicuously long and narrow. 



Measurements. — Type $, \y z years old, from dry specimen; total 

 length, 1530; tail vertebrae imperfect; hind foot, 355; ear from notch, 

 90; from crown, 100. Adult male, topotype No. 110,388, measured dry; 

 total lertgth, 1490; tail vertebrae 70; hind font, 370; ear from notch, 95; 

 from crown, 110. 



Skull of type: basal length, 240; alveolar length of upper tooth row, 

 00; of lower tooth row, 02; width over orbits, L50; width at base of 

 horns, 100; greatest width of nasals, 35; width of palate between alveoli 

 of next to hind molars, 4i'. Skull of five-year-old male, topotype, No. 

 110,047; basal length, 270; alveolar length of upper tooth row, SO; of 

 lower, 01; greatest width of nasals, 48; of palate, 40; circumference of 

 horns at base of fourth annual ring, 345; at base of fifth annual ring, 

 300. 



Remarks.— The skull of the female in this form presents the opposite 

 extreme from the conspicuously broad, flat face and nasals of merlon/ its 

 and presents another extreme of difference from the dark horns, light 

 and well arched molar series, small short nasals and wide rostrum of 

 canadensis ; it agrees with auduboni of the northern Badlands only in the 

 heavy dentition. 



