1o2 Fretp Museum or Naturat History — Zootoey, Vor. XI. 
Subfamily PTEROMYINE. 
Genus SCIUROPTERUS Cuvier. 
FLYING SQUIRRELS. 
Sciuropterus F. Cuvier, Dents du Mammiféres, 1825, p. 255. Type 
Sciurus volans Linn. 
Tail flat, thickly haired laterally; legs and body connected by 
loose skin which, when extended, becomes wing-like, enabling the 
animal to sail on a downward slant for a considerable distance; fur 
very soft and thick; occipital region depressed; rostrum short; infra- 
orbital foramen small and confined to lower part of maxillary; post- 
orbital process narrow and pointed (spine like); audital bullz large; 
eyes large. Two species occur within our limits. 
a Die ca 2-2 = 
Dental formula: 1. —, C.——, Pm.——, M.=>—~=22, 
I-I o-0 I-I 3-3 
KEY TO OUR SPECIES. 
Total length usually less than 10 inches; fur of belly white to base. 
SOUTHERN FLYING SQUIRREL. Sciuropterus volans, p. 102. 
Total length usually more than 1o inches; fur of belly dark at base. 
NORTHERN FLYING SQUIRREL. Sciuropterus sabrinus, p. 106. 
Subgenus GLAUCOMYS Thomas. 
Sciuropterus volans (LINN.). 
FLYING SQUIRREL. SOUTHERN FLYING SQUIRREL. 
[Mus] volans Linn., Syst. Nat., X ed, I, 1758, p. 63. ie 
Sciuropterus volans JORDAN, Man. Vert. Anim., 1890, p. 324. GARMAN, Bull. Essex 
Inst., X XVI, 1894, p. 5 (Kentucky). /BvERMANN & ButLer, Proc. Ind. Acad. 
Sci., 1893 (1894), p. 131 (Indiana). Tan, Proc. U. S. Nat. Mus., XXXII, 
1907, p. 459 (Illinois). Jb., Ann. Rept. Dept. Geol. & Nat..Resources Ind., 1908 
(1909), p. 485 (Indiana). OSBORN, Proc. Iowa Acad. Sci., I, 1887-89 (1890), 
p. 43 (Iowa). Ruoans, Proc. Acad. Nat. Sci. Phila., 1896 (1897), p. 197 (Ten- 
nessee). /SNyDER, The Oregon Naturalist, IV, 1897, p. 9 (Wisconsin). Jb., 
Bull. Wis. Nat. Hist. Soc., II, 1902, p. 118 (Dodge Co., Wisconsin). JACKSON, 
Proc. Biol. Soc. Wash., XX, 1907, p. 70 (Missouri). Jb., Bull. Wis. Nat. Hist. 
Soc., VI, 1908, p. 19 (Wisconsin). “Woop, Bull. Ill. State Lab. Nat. Hist., 
VIII, 1910, p. 533 (Champaign Co., Illinois). 
Sciuropterus volans volans BANGS, Proc. Biol. Soc. Wash., X, 1896, p. 162 (Missouri, 
Indiana, etc.). 
Sciuropterus volucella Herrick, Geol. & Nat. Hist. Surv. Minn., Bull. No. 7, 1892, 
p- 159 (Minnesota). 
