318 MAMMALIA: GLIRES. XL VIII. 



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

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

 larger animal. 



1034. L. campestris Bachman. JACK-RABBIT. PRAIRIE 

 HARE. Ears 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}. Ear 5. Kan. and 

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



FAMILY CLXXXII. HYSTRICID^EJ. (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 (Syenethermce) differ in many respects from the Old World 

 allies of the European Porcupine (Hystrix 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 

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

 (Lat. hystrix, porcupine). 



a. Tail short, thick, not prehensile; claws 45, long, compressed, and 

 curved; nostrils close together ERETHIZON, 538. 



538. ERETHIZON Frederic Cuvier. (IptBifa to irritate.) 



1035. B. dorsatus (L.) CANADA PORCUPINE. Dark brown, 

 spines tipped with yellowish white, and 4 to 6 inches long. L. 40. 

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

 dorsum, back.) 



FAMILY CLXXXIII. ZAPODID^B. (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, North American. 



539. ZAPTTS Coues. (a, 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 N., scarce ; variable. 



FAMILY CLXXXIV. GEOMYIDJE. (THE POUCHED 

 GOPHERS.) 



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

 Molars |-| ; incisors large and thick ; skull heavy ; temporal bones 

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

 number, very large ; tibia and fibula united. Body thick-set and 

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



