354 BRANCH CHORDATA 



Jumping-mice ( Dijiud'ida) (F'\g. 287) are represented by the American 

 jumping inifc and ihc Palaantic Jerboas. They have long tails and the 

 hind legs are greatly elongated and adapted for taking enormous leaps. 



Fig. 286. — Lombardy poplar killed by field mice. (Farmer's Bulletin 

 No. 33.5, U. S. Dept. of Agriculture, October, 1908.) 



Fig. 287. — Jumping mouse. (After Tenney.) 



The pouched gophers (Geomy'idce) have large cheek pouches opening ex- 

 ternally (Fig. 288, a, b, c). These burrowing rodents are restricted to Cen- 

 tral America and the central plains of North America. They have small ears 

 and eyes. The claws of the anterior limbs are strong. 



