v,ist of Illustrations 



FACING PAGE 



Young Woodland Caribou (Rangifer caribou) . . . . 61 



Typical Heads and Antlers of Cervidae ..... 64 



Pronghorn (Antilocapra americana) ..... 64 



Young Pronghorns (Antilocapra americana) . . . . 64 



Pronghofns (Antilocapra americana) 65 



Male Pronghorns (Antilocapra americana) .... 68 



Mountain Goat (Oreamnos montanus) . . . . . 69 

 Young Cow Musk Ox, about 16 months old (Ovibos mos- 



chatus) .. . . . . . . . 72 



Bull Bison (Bison bison) . . . . . ... . 73 



A Herd of American Bison (Bison bison) . . . . 76 



Nest of Young Cottontails . . ... . 77 



Young Cottontail Among the Cabbages (Lepus floridanus 



mallurus) . . . . . . . . . 77 



Varying Hale (Lepus americanus virginianus) . . . 84 

 Little Chief Hare, or Pika (Ochotona princeps) . . . . 85 



Canada Porcupine (Eretbi^on dorsatus), with quills thrown 



forward. In wild state . . . , . . 88 

 American Porcupine Swimming, with quills projecting (Ere- 



tbi{on dorsatus) . ....... 89 



Western Pocket Gopher (Tbomomys) . . . . . 104 



Western Long-tail Mouse, caught in the Bitter Root 



Mountains . . 105 



Long-tailed Jumping Mouse (Zapus hudsonius) . . . 105 



Mice and Shrews of the Eastern States . . . . . 1 20 



Western and Southern Mice and Rats . . . . . 121 



Muskrat (Fiber fibetbicus) . . . . . . 124 



Western Wood Rat, female (Neotoma) 125 



Cotton Rat (Sigmodon bispidus littoralis) . . . . 132 



Western Bushy-tailed Wood Rat (Neomtoa) . . . . 1 32 



White-footed Mouse (Peromyscus), enlarged . . . . 133 



White-footed Mouse and Young (Peromyscus leucopus) . . 140 



House Mouse on Trap (Mus musculus) . . . . . 141 



Common, or Norway Rat (Mus norvegicns) . . . 141 



Canadian Beaver (Castor canadensis) . . ... 148 



