KEY TO LAND MAMMALS OF NORTHEASTERN NORTH AMERICA IIS 



Family Erethizontidae New world porcupines 



Cheek teeth rooted ; do thumb; fur mixed with long stiff quilla. (Erethi- 

 z6ntidae; genus Erethizon) 



The new world porcupines are represented by three genera, two of 

 which are tropical. The third occurs throughout the wooded portion of 

 boreal North America. 



Genus Erethizon F. Cuvier 

 1825 Erethizon F. Cuvier, Dents des uiammifferes, p. 256. Type H y s t r i x 

 dorsatus Linnaeus 

 Tail short, not prehensile ; toes four in front, five behind. (Erethizon; 

 Gk., to irritate) 



The genus Erethizon is confined to the northern parts of North 

 America. Two species are known, one of which occurs within our 

 limits. 



Erethizon dorsatus (Linnaeus) Canada porcupine, ^^ hedgehog" 



1758 Hystrix dorsatus Liunaeus, Systema naturae, ed. 10. 1 : 57. (Canada) 

 1822 Erethizon dorsatus F. Cuvier, M^m. du museum d'hist. uat. 

 Paris. 9:432. 



Blackish; quills whitish tipped. Total length, 700 (28); tail vertebrae, 200 (8) 

 hin4 foot, 90 (3|^. (dorsatus; Lat., large-backed) 



The Canada porcupine occurs throughout the Canadian zone of north- 

 eastern North America wherever are still found sufficiently extensive 

 tracts of unbroken forest. It is chiefly arboreal in habits. The true 

 hedgehogs are very different animals (insectivores) confined to the old 

 world. 



Family Leporidae Hares 



Upper front teeth four, a large pair in front and a small pair immediately iehind; 

 front legs short; hind legs elongated for jumping; tail very short or rudimen- 

 tary. (Leporidae; genus Le pus) 



The family Leporidae, though nearly universally distributed out- 

 side of Australia and the neighboring islands, contains only two genera, 

 one of which is peculiar to the high mountains of southern Mexico. 



Genus Lepus Linnaeus 



1758Lepus Linnaeus, Systema naturae, ed. 10. 1:57. Type Lepus 

 t i m i d u s , Linnaeus. 



Tail well developed ; ears long and narrow ; hind legs very long. (L (5 p u s ; 

 Lat., a hare) 



The genus Lepus, the range of which is coincident with that of the 

 family, probably contains more than one hundred species. Four of these 

 <occur in northeastern North America. 



