■894-] 195 [Miller. 
pelage of E. gapped is somewhat paler, but the red is at the 
same time brighter and clearer than in summer. The differ- 
ences observable in the adults hold good when young of the two 
races are compared ; immature examples of E. gajiperi being 
much the darker and more red. 
In its long fur and pale color Evotomys gapperi ochraceus 
shows an approach to the arctic Evotomys rutilus. E. rutihcs is, 
however, a much redder animal, with more hairy feet and tail. 
A specimen of this species (N^o. 5581 Mus. comp. zool.), taken 
near the Porcupine River, Alaska, by Kennicott, is oran<re-rufous 
dorsally, the fur plentifully mixed with black-tipped hairs. The 
belly is buff (Ridgway, Nomenclature of colors, pi. 5, fig. 16), 
the sides and face a slightly paler shade of the same color. 
Dorsum of manus and pes, and ventral surface of tail concolor 
with belly. Dorsal surface of tail like the back, but rather 
more mixed with blackish hairs. Pencil, 10 mm. ; fur on rump, 
17 mm. 
Through the kindness of Messrs. S. N. Rhoads and Witmer 
Stone I have before me the type and several other examples of 
the Evotomys gapperi rhoadsii described by Mr. Stone^ from 
May's Landing, N. J. These specimens resemble Evotomys 
gapperi ochraceus in the reduction of the amount of red in the 
pelage, but instead of being paler and more ochraceous than 
E. gapperi they are distinctly darker and browner. 
This mouse needs no comparison with Evotomys carolinensis 
Merriam, which to judge by the description^ is a larger and 
darker animal, the back being dull chestnut liberally sprinkled 
with black-tipped hairs. The hind foot of E. carolinensis aver- 
ages "19.5 mm" ; of the E. gajiperi ochraceus 18.8 mm. 
Eight adult Evotomys and a two thirds grown youno- taken 
near the summit of Mt. Graylock, Mass. (3,500 feet) early in 
May, 1893, though not perfectly typical of E. gapperi ochraceus, 
approach this form more closely than they do true E. gapjieri. 
From this fact it seems probable that this new red-backed mouse 
will be found to inhabit the higher mountain tops throughout 
New England and New York. 
The foregoing descriptions and comparisons are based on an 
examination of twenty-three si.ecimens of Evotomys gapperi ochra- 
' Ainer. uat., v. 27, p. 54, Jan. 1893. 
- Amer. jouru. sci., ser. 3, v. .36, p. 460, Dec. 1888. 
