Miller.] 
196 
ceus and nearly three hundred specimens of E. gapperi and 
various allied forms. 
This red-backed mouse is the only abundant inaramal on the 
Alpine summit of Mount Washington. We found it in the most 
varied situations — in the foundations of the buildings on the 
summit ; among loose rock fragments where the only vegetation 
consisted of lichens and the hardy Carex rigida bigelovii; in tlie 
thick moss and dwarf willows {Salix herbacea) at the head of 
Great Gulf; throughout tlie Aljnne Garden, and among the scrub 
spruces near the head of Tuckerman's Ravine ; and by the margin 
of the Lake of the Clouds. Runways which we supposed were 
made by these animals abounded among the matted herbage just 
exposed by the melting snow in Tuckerman's Ravine and Oakes's 
Gulf, though the work may have been in part due to Arvicola 
chrotorrhinus. In fact wherever it was possible for a mouse to live, 
the red-backs occuyjied the ground almost to the exchision of all 
other species. Under a large flat stone in the Alpine Garden I 
found a nest filled with last year's berries of Vaccinium vitis-idaea. 
Runways led away in every direction among the sjihagnum, sedge, 
and scrub spruces. This was probably an Evotomys storehouse, 
for traps set here yielded tliis species exclusively. 
Measurements of Evotomys cjapperi ochraceus Miller. 
No. 
Locality. 
Date. 
Se.x. 
i 
S 
> g 
li 
- 
H 
X 
'o c 
2529 
Mt. Washinston.N. IT- 
Julv 9/93 
? ml. 
155i4l 
19 
14 
26.4 
2530 
.1 
" 11, •' 
? ad. 
157 
40 
19 
14 
25.5 
2531 
>.i a 11 
" 11, " 
$ ad. 
154 
42 
19 
13.4 
27.3 
2582 
a 11 li 
" 12, " 
? ad. 
171 
48 
20 
15 
28 
2533 
a a 11 
" 12, " 
? ad. 
148 
39.6 
19 
13 
26.8 
2534 
" 14, " 
? ad. 
153 
41 
19 
12.4 
26.8 
2535 
<( (< '< 
" 16, " 
? ad. 
152 
38 
19 
12 
25.1 
2541 
a u i' 
" 11, " 
^ ad. 
148 
40 
19.6 
13 
27.1 
2542 
U i. <• 
" 11, " 
(^ ad. 
161 
49 
19.8 
14.6 
30.4 
2543 
t. w 
" Jl, '• 
J ad. 
150 
40 
19.4 
14 
26.7 
2544 
a a ii. 
" 12, " 
S' ad. 
155 
42 
19 
12.8 
27.1 
2545 
.< i< 
" 13, " 
^ad. 
144 
39 
18.4 
12 
27.1 
2546 
a a i< 
" 13, " 
J ad. 
149 
41 
18.4 
14.2 
27.5 
2547 
I. U 4; 
" 15, " 
J ad. 
149 
37 
20 
14.5 
24.8 
2548 
a a << 
" 15, " 
S ad 
146 
37 
20 
14.5 
26.3 
2549 
" 
'• 15, " 
S ad. 
140 
35.5 
18.5 
14.5 
25.4 
