318 MAMMALIA: GLIRES. —— XLVIII. 
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. 31. Ear 5. Kan. and 
Dakota, to Oregon. (Lat., of the fields.) 
Famity CLXXXII. HYSTRICIDA. (Tue Porcurrnes.) 
Molar teeth ¢ on each side ; fur more or less mixed with bristly 
spines; tip of Gaere with naa hairs; tibia and fibula distinct. 
Genera 6; species about 50, largely American. The American 
forms (Syenetherine) 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 
Caviide, represented by the Guinea (Guiana) Pig. (Cavia aperea). 
(Lat. hystrix, porcupine). 
a. Tail short, thick, not prehensile; claws aval long, compressed, and 
curved; nostrils close together. oe . » ERETHIZON, 538. 
538. ERETHIZON Frédéric Cuvier. whee to irritate.) 
1035. E. dorsatus (L.) CANADA PorcuPpiINeE. 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.) 
Famity CLXXXITI. ZAPODIDA. (THE Jumprne Mice.) 
Hind legs greatly elongated, adapted for taking long leaps; fore 
legs short. Tail very long. Molars 44; upper incisors com- 
pressed, grooved; molars rooted; cheek pouches present; toes 
5-5; tibia and fibula united. A single species, North American. 
539. ZAPUS Coues. ((d, an intensive particle ; zovs, foot.) 
1036. Z. hudsonius (Zimmermann). JumprinG Mouse. Yel- 
lowish brown; fur coarse and rough; soles naked. L. 8. T. 5. 
Ear 4. U.S. chiefly N., scarce ; variable. 
Famity CLXXXIV. GHOMYIDAL. (THE PoucHED 
GOPHERS.) 
Cheek pouches large and distinct, opening outside of the mouth. 
Molars 4-4; 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 
