Family BOVIDAE Cattle, Sheep, Antelopes, Goats 



Both sexes usually with permanent, hollow, unbranched horns 

 on hony cores; second and fifth toes present 

 Three genera — Bison 



OVTS 



Oreamnos 

 Order XENARTHRA American Edentates 



Teeth absent or imperfectly developed, without enamel, not 

 specialised 



Family DASYPODIDAE Armadillos 

 One genus — Dasypus 



KEY TO THE PRINCIPAL LARGE GROUPS OF MAMMALS 



L Fingers of each fore limb greatly elongated and supporting a leathery, 

 membranous wing Bats 

 Fingers not greatly elongated and not supporting a wang 2. 



2. Feet with hoofs Ungulates or Hoofed Mammals 



Feet with claws 3. 



3. Incisor teeth usually smaller than most of the other teeth; canine teeth 



present; no large gaps between the teeth — or else with a row of un' 

 specialized teeth on each side of each jaw, without incisors or canines, 

 in one species which is covered by a bony "sheir' Carnivores and 

 similar mammals. 

 Incisor teeth larger than the others; no canine teeth; with a wide gap be- 

 tween the incisors and the cheek or grinding teeth; not more than two 

 incisors in the lower jaw Gnawing Mammals (Rodents, etc.) 



KEY TO THE PRINCIPAL SPECIES OF BATS 



L Ears very large, concealing the face when viewed from the dorsal side, 



and joined at base by a band across the forehead 2 . 



Ears not usually large enough to conceal the face, never joined by a band 



across the forehead 6. 



2. With either a leaf -like projection or a warty outgrowth on the end of the 



nose 3. 



Not so 5 . 



3. Nose with an upright, leaf 'like projection; southwestern U. S. into 



Mexico; Family Phyllostomidae 



Macrotus calif ornicus Baird Leaf'nosed Bat 

 Nose with a lump-like, warty outgrowth on the end; nostrils opening up' 

 wards; Family Vespertilionidae (part) 4. 



4. With white-tipped hairs on the abdomen; southeastern states 



Corynorhinus macrotis (Le Conte) Le Conte's Lump-nosed Bat 

 (Plecotus macrotis (Le Conte) ) 



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