KEY TO LAND MAMMALS OF NORTHEASTERN NORTH AMERICA IO9 



Genus Evotomys Coues 



1874 Evotomys Cones, Proc. aoad. nat. sci. Philadelphia, p. 186. Type M u s- 

 r u t i 1 u s Pallas. 



Front teeth without grooves, broader than deep ; grinding teeth rooted 

 (pronged) in adults, small and weak; iony palate ending in thin-edged 

 shelf behind : body short and thick ; tail short, ears usually just appearing above 

 fur ; color of hack usually distinctly red. (Evdtomys; Gk., well-eared mouse) 



The genus Evotomys which occurs throughout the cooler part of 

 the northern hemisphere is represented in America by about 25 forms. 

 Five species occur within our limits. 



SPECIES OF EVOTOMYS 



. Eed area on back fading insensibly into color of sides 

 Ears small, completely covered by the surrounding fur; 



teeth small E. ungava 



Ears large, appearing conspicuously above surrounding 



fur; teeth very heavy E. carolinensis 



Eed area on back sharply defined from color of sides 

 Tail considerably more than twice length of hind foot ... E. protons 



Tail scarcely more than twice length of hind foot, or less 



Hind foot about 19 (i) ; skull small; teeth light E.gapperi 



Hind foot about 21 (it); skull large; teeth heavy E. rhoadsi 



Evotomys ungava Bailey Ungava red-hacked mouse 



1897 Evotomys ungava Bailey, Proc. biolog. soc. Washington. 13 May 

 1897. 11:130. (Fort Chimo, Ungava, Labrador) 



Ears very small, not projecting above fur; back dull brownish chestnut, fading 

 insensibly into huffy gray of sides; tail about twice as long as hind foot. Total 

 length, 135 (5i) ; tail vertebrae, 40 (lA) ; hind foot, 19 (f). (u n g d v a ; N. Lat., 

 Ungava) 



The Ungava red-backed mouse is known from Ungava, Labrador only. 

 Evotomys carolinensis Merriam Carolina red-backed mouse 



1888 Evotomys carolinensis Merriam, Amer. jour. sci. and arts. Deo. 



1888. 36: 460. (Roan mountain, North Carolina) 

 1897 Evotomys carolinensis Bailey, Proc. biolog. soc. Washington. 13 



May 1897. 11 : 130. 



Ears large, projecting conspicuously above f iir ; hack dark chestnut fading in- 

 sensibly into bister of sides ; tail about twice as long as hind foot. Total length, 

 150 (5J); tail vertebrae, 45 (If); hind foot, 21 («). (Carolinensis; N. 

 Lat., Carolinian) 



The Carolina red-backed mouse is confined to the boreal mountain 

 forests of the southern Alleghanies (Tennessee, North Carolina, West 

 Virginia and Virginia). 



