53 
Measurements of Lemmus trimucronatus from Various Localities 
in Baffin Island — Continued 
No. 
Date 
Locality 
Sex 
Length 
Tail 
Hind foot 
6057 
Oct. 
16, 
1925. . 
Pangnirtung fiord 
d 
Mm. 
114 
Mm. 
13 
Mm. 
17 
6058 
ft 
16, 
1925.. 
tt 
$ 
118 
14 
19 
6059 
it 
16, 
1925. . 
it 
d 
115 
13 
18 
6060 
tt 
18, 
1925. . 
tt 
d 
125 
16 
18 
6061 
u 
18, 
1925. . 
tt 
d 
132 
16 
18-5 
6062 
tt 
18, 
1925. . 
tt 
9 
127 
12 
18-5 
6063 
tt 
18, 
1925. . 
tt 
d 
125 
12 
18 
6064 
it 
18, 
1925. . 
tt 
d 
112 
11 
18 
6065 
it 
18, 
1925. . 
tt 
d 
123 
12 
19 
6066 
tt 
19, 
1925. . 
ft 
d 
114 
13 
18 
6067 
it 
19, 
1925. . 
tt 
d 
118 
13 
19 
6068 
tt 
19, 
1925. . 
tt 
d 
125 
15 
19-5 
6069 
tt 
19, 
1925. . 
ft 
9 
112 
14 
19 
6070 
tt 
19, 
1925. . 
tt 
d 
113 
12 
18 
6071 
tt 
19, 
1925. . 
it 
9 
115 
13 
19 
6072 
tt 
19, 
1925. . 
a 
d 
110 
13 
19 
6073 
tt 
19, 
1925, . 
tt 
d 
116 
15 
19 
6177 
June 
4, 
1926. . 
Cape D orest. 
d 
128 
15 
20 
6178 
tt 
4, 
1926. . 
it 
d 
120 
15 
18 
6179 
tt 
4, 
1926. . 
tt 
9 
120 
16 
18 
6180 
tt 
4, 
1926. . 
tt 
9 
105 
14 
16 
6181 
it 
4, 
1926. . 
tt 
9 
92 
10 
17 
6182 
tt 
4, 
1926.. 
it 
9 
87 
11 
15 
6183 
ft 
6, 
1926. . 
it 
d 
87 
12 
15 
6192 
tt 
9, 
1926. . 
it 
9 
112 
17 
19 
6193 
tt 
9, 
1926. . 
tt 
d 
115 
15 
18 
6194 
if 
9, 
1926. . 
it 
d 
127 
16 
19 
6195 
ft 
9, 
1926. . 
tt 
d 
110 
14 
18 
6196 
tt 
9, 
1926. . 
tt 
d 
100 
14 
18 
6197 
it 
9, 
1926. . 
it 
d 
113 
13 
18 
6198 
tt 
11, 
1926. . 
tt 
9 
115 
20 
20 
6199 
ft 
11, 
1926. . 
tt 
d 
122 
15 
19 
6200 
ft 
lb 
1926 
tt 
d 
125 
14 
19 
6201 
ft 
11, 
1926. . 
it 
d 
120 
14 
19 
6202 
it 
11, 
1926. . 
tt 
d 
117 
17 
18 
6203 
tt 
15, 
1926. . 
it 
9 
132 
16 
20 
6204 
ft 
15, 
1926. . 
tt 
9 
140 
15 
20 
6205 
it 
15, 
1926. . 
it 
9 
100 
13 
18 
6208 
ft 
17, 
1926. . 
tt 
9 
122 
16 
19 
6209 
tt 
17, 
1926. . 
tt 
9 
140 
17 
20 
6212 
tt 
21, 
1926. . 
it 
d 
110 
14 
18 
6213 
it 
21, 
1926. . 
tt 
9 
108 
15 
18 
6215 
tt 
27, 
1926. . 
Fox islands 
9 
138 
18 
20 
6216 
tt 
29, 
1926. . 
tt 
d 
127 
16 
20 
Describing the specimens from southwestern Baffin island, collected 
by the MacMillan expedition, Allen and Copeland (1914, pp. 8-9) write: 
"Although it does not become white in winter like its near relative Dicrostonyx, there 
is nevertheless a very obvious difference between summer and winter coat. That of 
summer, in addition to being shorter and less silky, has a well-marked chestnut patch on 
the rump, standing out in contrast with the bright fulvous of the flanks; whereas the 
winter pelage is a nearly uniform ochraceous posterior to the shoulders, quite without the 
chestnut patch. This difference does not seem to have been generally noticed and a failure 
to recognize the two pelages is perhaps partly responsible for the account of supposed colour 
differences of the race yukonensis. Of this latter we have examined skins taken at no 
great distance from the type locality and do not find any characters that will separate them 
from comparable specimens of the brightly coloured alascensis of point Barrow, which is 
distinguishable from typical trimucronatus by its brilliant ochraceous-rufous sides and 
belly, in contrast with the pale ochraceous wash seen in the latter. The original descrip- 
tion of the race alascensis seems to have been based on the winter pelage, whereas that of 
yukonensis was founded on a summer specimen." 
