KEY TO LAND MAMMALS OF NORTHEASTERN NORTH AMERICA III 



Evotomys gapperi ochraceus Miller, Mount Washington 



red-backed mouse 



1894 Evotomys gapperi ochraceus Miller, Proc. Boston soc. nat. hist. 



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

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



Washington. 13 May 1897. 11 : 124. 



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

 clay color; belly dirty whitish. Total length, 150 (5|) ; tail vertebrae, 40 (li^) ; 

 hind foot, 19 (f ). (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) New Jersey red-backed mouse 



1893 Evotomys gapperi rhoadsi Stone, American naturalist. Jan. 

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



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

 ton. 13 May 1897. 11 : 125. 



Ears large, projecting conspicuously above fur; back dark 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 (5|) ; tail vertebrae, 40 (li%) ; hind foot, 21 {\%\ (rhoadsi; name from that 

 of Samuel N. Rboads) 



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

 cool bogs of southern New J ersey and southern New York only. 



Family Dipodidae Jerboas and jumping mice 



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

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

 Napaeozapus); skull with a conspicuous aperture opening forward in 

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

 genus, D i p 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. 



GEINE^RA OP DIPODIDAJB 



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



grinder in upper jaw Zap us 



No small tooth in front of first well developed grinder in 



upper jaw ......._...,_. Napaeozapus 



