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VERTEBRATE ANIMALS OF THE UNITED STATES 



Subspecies of O. princeps 



0. p. princeps (Richardson). Western Montana and northern 

 Idaho; north into Canada. 



0. p. hrunnescens (Howell). Color brownish: Cascade Range from 

 British Columbia south to central Oregon. 



0. p. saxatilis (Bangs). Size large; length 200 mm.; color pale 

 yellowish brown : mountains of Colorado, north into Wyoming; west into 

 Utah. 



O. p. ventorum (Howell). Color lighter: northwestern Wyoming 

 into ]\Iontana and Idaho. 



0. p.figgitisi (Allen). Color pale; size small: central Idaho. 



0. schisticeps (Merriam). Color gray suffused with fulvous; top of 

 head slate-gray; length 188 mm.; hind foot 29 mm.; tail vertebra? 9 

 mm.: Cascade and Sierra Nevada Mountains; 9 subspecies. 



0. s. cinnamomea Allen. Color pale cinnamon rufous, darker in the 

 middorsal region; top of head gray; similar to 0. schisticeps, but smaller 

 and lacking the slate-gray area on the head: Beaver Range, Utah, above 

 10,000 feet elevation. 



Order 9. Ungulata. — Hoofed animals. Mammals of large size 

 with I to 4 hoofs on each foot; molar teeth with broad crowns and 

 adapted to the mastication of grasses and grains : about a dozen families, 

 grouped in 2 suborders, and distributed throughout the world except 

 in the AustraUan region, of which 4 occur in North America and 2 

 in the United States and Canada. The order contains the most 

 important domestic animals. 



Key to the Suborders of Ungulata 



ai Number of hoofs on each foot either 2 or 4; even-toed ungulates. i. Artiodactyla. 



a; Number of hoofs on each foot i or 3; odd-toed ungulates; no 

 native species in the United States; horses; tapirs; rhinoc- 

 eroses 2. Perissodactyla. 



Suborder Artiodactyla.^Even-toed ungulates. Third and fourth 

 digits prolonged beyond the others and support the animal's body; 

 premolar and molar teeth usually not alike; stomach complex: about 

 300 species grouped in 2 divisions; about 40 species in the United 

 States and Canada. 



Key to the Divisions of Artiodactyla 



ai Upper incisors and canines presents i- Sum a. 



ao Upper incisors and canines absent 2. Riiminantla. 



