FEB., 1912. MamMats OF ILLINOIS AND WISCONSIN—CoRY. 237 
Synaptomys cooperi fatuus (Bancs). 
Bancs’s Lemminc Mouwse. 
Synaptomys fatuus BanGs, Proc. Biol. Soc. Wash., X, 1896, p. 47. MILLER, Proc. 
Bost. Soc. Nat. Hist., XXVIII, No. 1, 1897, p. 11 (North Bay and Peninsular 
Harbor, Ontario). 
Type locality — Lake Edward, Province of Quebec, Canada. 
Distribution — Eastern Canada, south to Maine, New Hampshire 
and northern Wisconsin and probably northern Michigan and Minne- 
sota; exact limits of range unknown. 
Description— Similar to S. cooperi, but averaging somewhat smaller and 
darker, the skull smaller and the upper incisors shorter and narrower. 
Measurements — Total length, about 4.75 in. (120.5 mm.); tail 
vertebre, .69 in. (17.5 mm.); hind foot, .71 in. (r8 mm.). 
The following are the field measurements of six specimens collected 
by Mr. W. H. Osgood in northern Wisconsin: 
Total Length. Tail Vertebre. Hind Foot , 
No. 18302, o', Conover, Vilas Co....... 128 mm. 18 mm. 18.5 mm. 
No. 18304, 9, Conover, Vilas Co....... 122 “ 18 “ 185 “ 
No. 18303, 9, Conover, Vilas Co....... 121 “ 17 i “ 
No. 18305, 9, Lac Vieux Desert, VilasCo. 117 “ 7 19 “ 
No. 16250, 9, Sayner, Vilas Co........ 103 “ 1 19 “ 
No. 16249, o’, Solon Springs, DouglasCo. 116 “ 7 ws“ 
So far as I am aware, Bangs’s Lemming Mouse has not been pre- 
viously recorded from Wisconsin. Specimens in this Museum from 
northern Wisconsin approach much nearer to this form than to cooperi 
and agree very well in size and cranial characters with those from the 
type locality. Bangs’s Lemming Mouse is, no doubt, not uncommon 
in suitable localities throughout at least the northern portion of the 
state. Its natural habitat is wet bogs and sphagnum swamps both 
in open places and in woods. Mr. Osgood informs me that in the 
localities he visited in Vilas County they were quite scarce and were 
only found in small numbers in isolated colonies in cold sphagnum 
swamps. Even where occasional specimens were caught, continued 
trapping often failed to secure others. Mr. Gerrit 5. Miller secured 
specimens of this Mouse at Peninsular Harbor, Ontario, in the northern 
shore of Lake Superior, where, he says, it frequently occurs at the bor- 
ders of clearings especially near boggy places grown up to bushes. He 
caught one under the foundation of a disused log cabin in low ground 
near the woods and secured others in pitfalls dug at the edge of a garden. 
He says, ‘wherever the animal occurred it lived in cavities among roots 
covered with moss and sphagnum. Even in places where it was most 
abundant I could find no beaten runways.” (J. ¢., p. 12). 
