Hairs of back not obviously tricolor; calcar not keeled; foot usually more 

 than one-half the length of the tibia; fourth finger more than three 

 fourths the length of the third 28. 



28. Occurring in the southwestern states; forearm of adult more than one 



and one-half inches long 



Myotis vehfer (Allen) 

 Forearm of adult not over one and one-half inches long, or else east of 

 the Mississippi River 29. 



29. In the western states; with a well developed lobe at the end of the calcar 



Myotis yumanensis (Allen) 

 In the eastern and central states; no or a minute lobule at the end of the 

 calcar 



Myotis austrori^arius (Rhoads) 



KEY TO THE PRINCIPAL SPECIES OF UNGULATES OR 

 HOOFED ANIMALS 



L Decidedly pig-like, but with a very short tail and with upper canines 

 directed downwards; Mexican border states; Family Tayassuidae 

 Pecan angulatus (Cope) Peccary, Musk-hog 

 (Tayassu angulatus (Cope) ) 

 Not so 2. 



2. Ox-like, as large as domestic cattle; both sexes with horns like those of 



cattle; with long hair on head and shoulders; a hump on the shoulders; 

 formerly abundant on the plains and prairies, now restricted to game 

 refuges and parks; Family Bovidae (part) 

 Bison hison (Linn.) Bison, Buffalo 

 Deer, sheep or goat-like 3. 



3. Deer-like, with or without antlers 4. 

 Sheep-like or goat-like, horned 12. 



4. Antlers (really horns) almost upright directly above the eyes, each with 



one short front branch; whole rump covered with long white hairs, 

 which can be erected; western states; Family Antilocapridae 

 Antilocapra americana (Ord) Pronghorn Antelope 

 Antlers not present or not as described above; Family Cervidae 5. 



5. End of nose entirely covered with hair; upper canine teeth usually present; 



hoofs broad and flat; antlers, which may be present on either sex, some- 

 what flattened, palmate 6. 

 With a strip on the end of the nose not covered with hair; other characters 

 various 7. 



6. Color warm brown, darker on the legs; extreme northern and north- 



eastern U. S. 



Rangifer caribou caribou (Gmelin) Woodland Caribou, Ameri- 

 can Reindeer 

 Color blackish-brown, almost black on the legs; northern Rockies 

 Rangifer arcticus montanus Seton Mountain Caribou 



7. With a small strip between the nostrils not covered with hair; no upper 



canines; antlers (of male, if present) much flattened and largely in one 



487 



