THE MAMMALS OF NEW JERSEY. 67 
the individuals inhabiting the mountains differed slightly from 
those of the Atlantic plain and named the latter Synoptomys 
stonei, but there seems to be no constant difference between the 
two. 
Coopers’ Lemming Mouse is an inhabitant of cold, wet bogs, 
where it lives in runways through the sphagnum, in company with 
the meadow mouse, red-backed mouse and long-tailed shrew. 
It is harder to catch than the other species, which may account 
for its apparent rarity. We know practically nothing of its habits 
though it probably feeds on the roots of swamp plants of various 
sorts. 
Synaptomys coopert Baird, Mammals of N. America, p. 558. 
Synaptomys stonet Rhoads, Amer. Naturalist, 1893, p. 53.— 
Bangs, Proc. Biol. Soc. Wash., 1894, p. 99. 
Synaptomys coopert stonei Rhoads, Proc. Acad. Nat. Sci. 
Phila., 1897, p. 305 and 392. 
Synaptomys stoner Rhoads, Amer. Naturalist, 1893, p. 53.— 
Bangs, Proc. Biol. Soc. Wash., 1894. 
Synaptomys cooperi stonei Rhoads, Proc. Acad. Nat. Sci. 
Phila., 1894, p. 392, and 1897, p. 305.—Rhoads, Mam. Pa. and 
Pls L903, p:, 106. 
Synaptomys coopert Rhoads, Mam. Pa. and N. J., 1903, p. 106. 
Genus Evotomys Coues. 
Red-Backed Mice. 
Evotomys gapperi rhoadsi Stone. 
Rhoads’ Red-Backed Mouse. 
PEATE 21, Fic: 1m 
Length 5.60 inches. Ears just visible above the fur, color red- 
dish chestnut with numerous black hairs interspersed on the back, 
sides buffy, below whitish, somewhat suffused with buff, feet light 
eray, tail brown above, gray below. 
I discovered this interesting mouse in a bog near May’s Land- 
ing, October 25, 1892, securing a specimen in the large runways 
