444 



KErOKT OP STATE CROLOOTST. 



L. Tail bushy; no pouches opening inside 

 cheeks; homes in trees; no stripes on 

 back. (Tree squirrels.) 



Genus Sciurus, p. 460 

 LL, Tail not very bushy; pouches opening 

 between teeth and skin of cheek; 

 homes in ground. 

 M. General color of body rich chest- 

 nut brown with stripes of black- 

 ish and whitish; four grinding 

 teeth on each side of upper jaw. 

 (Chipmunk.) 



Genus Tamias, p. 470 

 MM. General color dull grayish brown; 

 five grinding teeth in the upper 

 jaw. (Spermophiles, often called 

 "gophers.") 



Genus Citellus. p. 475 

 II. Never more than three grinding teeth in lower 

 jaw; tail slender and round, with hairs short 

 and lying close to the skin, or tail almost de- 

 void of hairs. (Rats and mice.) 

 J. Hind feet and tail very long; upper jaw teeth 

 four; (head and body about three inches, 

 tail over four inches and hind foot more 

 than one inch). (Jumping mice.) 



Family Zapodidae, Genus Zapus, p. 527 

 JJ. Hind foot and tail proportionately shorter, 

 upper jaw teeth three. Family Muridae. 

 K. Upper incisors with grooves down the 

 front. 



L. Form thick set- with short legs, short 

 ears, and tail less than one inch. 



Genus Synoptomys, p. 521 

 LL. Proportions about as in the common 

 house mouse, but smaller. 

 Genus Reithrodontomys , Appendix, p. 640 

 KK. Upper incisors without grooves. 



L. Habits aquatic; tail long and flattened 

 at the sides. fMuskrat.) 



(Jenus Fiber, p. 517 

 LL, Not aquatic; tail round. 



M. Form stout, with short legs and 

 ears; tail not over half as long as 

 head and body; crowns of molars 

 with loops and triangles. 

 (Meadow mice.) 

 N. Color rusty reddish on back; 

 molars rootless. (Rare or 

 absent from Indiana.) 

 (Jenus Fjvotomys, Appendix, p. 642 



