106 Firtp Museum or NaturaL History — Zoétoey, Vor. XI. 
struck a few blows with a stick, they will come out and appear to be as 
lively as usual. 
In an article in The Oregon Naturalist Mr. W. E. Snyder says, 
“T recall having found (at Beaver Dam, Wisconsin), in the winter of 
1890, what I consider almost a large family. One side of a large burr 
oak tree was dead while the other was yet alive. The tree was a hollow 
one. Breaking in the dead shell, I found twenty-two full-grown 
Flying Squirrels, Sciuroplerus volans. Of course it was several families 
united as one, for protection from the rigors of a Wisconsin winter” 
cde De 6): 
Specimens examined from Illinois, Wisconsin and adjoining states: 
Illinois — Willow Springs, 1; Golconda, Pope Co., 1; Warsaw, Hancock 
Co., 1; Olive Branch, Alexander Co., 1=4. 
Minnesota — Aitkin, Aitkin Co., 2. 
Indiana — La Porte, 1; Kankakee marshes, 1=2. 
Towa — Knoxville, 1. : 
Wisconsin — (M. P. M.) Maiden Rock, 1; Rochester, Racine Co., 1; 
Fountain City, 1; Pine Lake, 1; Elm Grove, Waukesha Co., 2; 
Burnett Co., 1; Stanley, 1; Milwaukee, 2; Milwaukee Co., 3; (O. C.) 
Nashotah, Waukesha Co., 8; Delafield, 1; Pewaukee, 1; (O.) Wal- 
worth Co., 2=25. 
Sciuropterus sabrinus (SHaw). 
NoRTHERN FLYING SQUIRREL. 
Sciurus sabrinus SHaw, Gen. Zool., I, 1801, p. 157. 
Pteromys Hudsonicus STRONG, Geol. Wis., Surv. 1873-79, I, 1883, p. 439 (Wisconsin). 
Sciuropterus sabrinus BaNGs, Proc. Biol. Soc. Wash., X, 1896, p. 162. MILLER, 
Proc. Bost. Soc. Nat. Hist., XXVI, 1897, p. 34 (Nipigon, Ontario). ADAMs, 
Rept. State Board Geol. Surv. Mich., 1905 (1906), p. 129 (Michigan). Jackson, 
Bull. Wis. Nat. Hist. Soc., VI, 1908, p. 19 (Wisconsin). 
Pleromys sabrinus LAPHAM, Trans. Wis. State Agr. Soc., II, 1852 (1853), p. 339 
(Wisconsin). 
Sciuropterus volucella hudsonius MeRRIAM, Mamm. Adirondack Reg., 1886, p. 206, 
Type locality — Severn River, Keewatin, Canada. 
Distribution — Extreme northern border of eastern United States 
northward (see map). 
Special characters — Decidedly larger than S. volans, and white fur on 
under parts plumbeous gray at base, instead of all white as in that 
species. 
Description — In summer: Upper parts tawny brown, strongly tinged 
with drab; cheeks grayish; a narrow dark ring around the eye; 
flying membrane largely dark drab brown on upper surface; under 
