318 mammalia: glires. — xlviii. 



has median brown band on fur broad. Further X. (Hudson's 

 Bay) occurs the European Hare, L. timidus L., a similar but 

 larger animal. 



1034. L. campestris Bachman. Jack-Rabbit. Prairie nsm. 

 Hare, liars much Longer than head. Fur pale yellowish gray 



in summer, in winter white at surface and base, yellowish in 

 middle; tail long, all white. L. 23. T. 3 1 . Ear 5. Kan. and 

 Hakota. to Oregon. (Lat., of the fields.) 



Family CI. XXXII. HYSTRICID^J. (The Porcupines.) 



Molar teeth ^ on each side ; fur more or less mixed with bristly 

 spines ; tip of muzzle with small hairs ; tibia and fibula distinct. 

 Genera 6; species about 50, largely American. The American 

 forms ( Syenetherinos) differ in many respects from the Old World 

 allies of the European Porcupine (Hystriz cristata L.). The 

 former are chiefly arboreal, and most of them have the tail pre 

 hensile. Allied to this family is the South American group of 

 ( 'aviidoe, represented by the Guinea (Guiana) Pig. (Cavia aperea). 

 (Lat. hystrix, porcupine). 



a. Tail short, thick, not prehensile; claws 4-5, long, compressed, and 

 curved; nostrils close together Eeethizon, 538. 



538. ERETHIZON Frederic Cuvier. (epeBlCo, to irritate.) 



1035. E. dorsatus ( L.) Canada Porcupine. Dark brown, w 

 spines tipped with yellowish white, and 4 to G inches long. L. 40. 

 T. 6. N. Am., from Me. to Mexico, formerly common. (Lat., 

 dorsum, back.) 



Family CLXXXIII. ZAPODID^E. (The Jumping Mice.) 



Hind legs greatly elongated, adapted for taking long leaps ; fore 

 legs short. Tail very long. Molars ££ ; upper incisors com- 

 pressed, grooved ; molars rooted ; cheek pouches present ; toes 

 5-5 ; tibia and fibula united. A single species, Xorth American. 



539. ZAPUS Coues. (£d, an intensive particle ; irovs, foot.) 



1036. Z. hudsonius (Zimmermann). Jumping Mouse. Yel- 

 lowish brown ; fur coarse and rough ; soles naked. L. 8. T. 5. 

 Ear |. U. S. chiefly X., scarce ; variable. 



Family CLXXXIV. GEOMYID^E. (The Pouched 



Gophers.) 



Cheek pouches large and distinct, opening outside of the mouth. 

 Molars ^-J ; incisors large and thick ; skull heavy; temporal bones 

 enormously developed. Limbs about equal, the fore claws five in 

 number, verv larsre ; tibia and fibula united. Body thick-set and 

 clumsy. Genera 2, species 7; all Xorth American, and chiefly 



