MICHIGAN ACADEMY OF SCIENCE. 
141 
9. Pcromyscus maniculatus gracilis (Le Conte). Michigan Mouse. — 
As stated above, this species is a common form in the Douglas Lake 
region. 
Museum Number. 
Sex. 
Length. 
Tail. 
Foot. 
413S5 . 
Adult male 
171 
85 
20 
413S7 
Adult female 
177 
SS 
20 
41383 
? female 
145 
61 
19 
10. , Microtus pennsylvamcus (Ord.). Meadow Mouse. — This species 
was found to be quite plentiful in the meadows east of Douglas Lake. 
As one would expect, none were found in the woods and “pineries.” Two 
specimens were taken. 
Museum Number. 
Sex. 
Length. 
Tail. 
Foot. 
41382 
Adult male 
145 
43 
21 
Adult male 
160 
47 
21 
11. Fiber zibcthicus (Linn.). Muskrat.— Probably because Douglas 
Lake has a sandv beach nearly all around it. not many muskrats are 
found along its shores. A few live in a small bayou on the west side 
of North Fish-tail Bay. Negro River which lies east of Burt Lake has 
very swampy shores and is an ideal place for mink and muskrats, and 
they are found in great abundance there. The specimen taken was so 
well concealed among the lily pads that it required the aid of field glasses 
to ascertain its hiding place. 
. Museum Number. 
Sex. 
Length. 
Tail. 
Foot. 
41395 
Adult female 
477 
237 
SO 
Adult ? 
478 
235 
' 78 
12. Synaptomys cooperi Baird. Cooper’s Lemming Vole. — This lem- 
ming looks much like the Pennsylvania meadow mouse, except that it 
has a very short tail and has grooves along the front of the front in- 
cisors. Its fur or hair is coarser and grayer than that of the meadow 
mouse. It is quite plentiful in the sphagnum bogs near Burt Lake and 
along Carp Creek. The writer lias seen these little animals take to the 
water in Carp Creek and swim rapidly across the strong current appar- 
ently with the relative strength of the muskrat. 
Museum Number. 
Sex. 
Length. 
Tail. 
Foot. 
Ear. 
41381 
Male 
114 
IS 
19 
11 
