KEY TO LAND MAMMALS OF NORTHEASTERN NORTH AMERICA III 



Evotomys gapperi ochraceus Miller, Mount Washington 

 red-hacked mouse 



1894 Evotomys gapperi ochraoeus Miller, Proc. Bostoa soe. nat. hist. 



24 Mar. 1894. 26: 193. (Mt WasLiugton, New Hampshire) 

 1897 Evotomys gapperi ochraceus Bailey, Proc. biolog. soe. 



Washington. 13 May 1897. 11 : 124. 



Back pale, dull, rusty rufous, without sprinkling of blackish hairs, sides buffiy 

 clay color; belly dirty whitish. Total length, 150 (5f) ; tail vertebrae, 40 (lA) ; 

 hind foot, 19 (i). (ochraceus; Lat., ochraceous) 



The Mt Washington red-backed mouse is so far as known confined to 

 the upper boreal zone of Mt Washington, New Hampshire. 



Evotomys rhoadsi (Stone) JVew Jersey red-backed mouse 



1893 Evotomys gapperi rhoadsi Stone, American naturalist. Jan. 

 1893. 27 : 54. (Mays Lauding N. J.) 



1897 Evotomys gapperi rhoadsi Bailey, Proc. biolog. soe. Washing- 

 ton. 13 May 1897. 11: 125. 



liars large, projecting conspicuously above fur; back 3ark chestnut, sharply 

 marked off from buffy gray of sides; skull and teeth much heavier than in E. 

 gapperi, in this respect resembling 'E. carolinensis. Total length, 

 140 (5J); tail vertebrae, 40(li%); hind foot, 21 (!|). (rhoadsi; name from that 

 of Samuel N. Eboads) 



The New Jersey red-backed mouse has thus far been found in the 

 cool bogs of southern New Jersey and southern New York only. 



Family Dipodidae Jerboas and jumping mice 



Front teeth two, compressed (in our genera eaoh with a deep longitudinal groove 

 en front face) ; cheek teeth in upper jaw usually four on each side (three iu 

 Napaeozapus); skull with a conspicuous aperture opening forward in 

 front of the eye socket ; tail and hind legs elongated for j umping. (Dipodidae; 

 genus. Dip u s) 



The family Dipodidae is widely distributed through North Amer- 

 ica, Asia, Africa and eastern and northern Europe. Half a dozen or 

 more old world genera are now recognized, while only two are found in 

 America. The latter form the subfamily Zapodinae. 



GSIVBRA OF DIFODIDAB 



-A small, probably useless'tooth in front of first well developed 



grinder in upper jaw Zapus 



No [small tooth in front of fi.rst well developed grinder in 



upper jaw Napaeozapus 



