44 Frerp MusrEum or Natura History — Zo6é.oey, Vor. XI. 
a2. Tail not thickly haired;. cheeks with large external pouch open- 
ing outside of mouth; front of incisors 
deeply grooved; claws on fore feet very 
long. 
Family GEOMYIDZ. 
Pocket Gophers, p. 239. 
B. Not more than 3 well developed grinding teeth on side of jaw; tail 
closely haired, or in some species nearly or quite naked. 
bi. Hind feet ordinary, not greatly elongated. 
Family MURIDZ. Rats and Mice, p. 171. 
b2. Hind feet much elongated; tail very long; size small (in one 
species a very small premolar is present in 
addition to the three well developed molars). 
yf 
OD 7 P 
7 A Vy o Family ZAPODIDA. Jumping Mice, p. 246. 
SECTION 2. Upper front teeth (incisors) 4; two large incisors and 
two very small ones directly behind them; 
ears and hind legs noticeably long. 
Family LEPORIDA. Hares and Rabbits, p. 259. 
