318 MAMMALIA: GLIRES. — XLVIII. 



Hare. Ears about as long as head; fur, in summer, cinnamon 

 brown, in winter, becoming white at the surface, plumbeous at 

 base, with a median band of reddish brown. L. 20. T. 2^. Ear 3. 

 In Evergreen woods. The typical americanus, with ears white 

 edged, is found only about Hudson's Bay, 8. to Ontario. Sub- 

 spec, virginianus (Marian), the common form in the U. S. in pine, 

 fir, and hemlock forests, Minn, to New Brunswick, S. to Va., has 

 the white border of car small or wanting, the median brown band 

 broad. Subspec. struthopus Bangs, from Nova Scotia, similar to 

 typical virginianus, but having the hind foot much smaller; color 

 in suunner pelage darker and duller. {arpovBos, a small bird; 

 1T0VS, foot.) 



1034. L. campestris Bachman. jACK-RAnBiT. Praikie 

 Hark. Ears nuuh louLjcr than head. Fur pale yellowish gray 

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

 middle; tail long, all whhe. L. 23. T. 3\. Ear 5. Kan. and 

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



Family CLXXXII. ERETHIZONTID^. (The Ameri- 

 can PoRcmxEs.) 



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

 barbed spines ; tip of muzzle with small hair ; tibia and fibula dis- 

 tinct. Genera 3, all American. The American Porcupines differ 

 in many respects from the Old World Porcuj)ines {Ilrjstricidd). 

 The former are chiefly arboreal, the latter terrestrial. AlUed to 

 this family is the South American group of Caviidce, represented 

 by the Guinea (Guiana) Pig (Cavia apered). 



a. Tail sluirt, thick, not prehensile; claws j, long, compressed, and curved; 

 nostrils close together Ehethizon, bi%. 



538. ERETHIZON Frdddric Cuvier. {(ptdl^cn, to irritate.) 



1035. E. dorsatua (L.). Canada Pokcuimne. Dark brown, 

 spines tip|)c<l with yellowish white, and 1 to fi inches long. L. -40. 

 T. 6. E. N. Am., from jNIe. to Penn., formerly common. (Lat., 

 dorsum, back.) 



Family CLXXXIII. DIPODID^. (Tiik JtMi-iNG Mick.) 

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

 legs short. Tail very long. Molars J:J or ^:|; upper incisors 

 compressed, grooved ; molars rooted ; internal cheek ])ouches pres- 

 ent ; toes 5-5 ; tibia and fibula united. Genera G ; species numerous ; 

 one genus, Znjms, chiefly American. 



539. ZAPUS Coues. (fd, an intensive particle ; ttou?, foot.) 

 103G. Z. hudsoniuB (Zimmermann). .Ti'Mpino Mouse. Yel- 

 lowish l)rown ; fur coarse and roncrh ; solos naked. Molars |:J. 

 L. 8. T. 5. Ear J. U. S. chiefly N. ; variable. 



