Feb., 1912. Mammals of Illinois and Wisconsin — Cory. 107 



'Area of intergradation 



Map illustrating approximate distribution of Flying Squirrels in eastern United States. 

 In the areas indicated by the dotted space between the ranges given for different races, either 

 or both may occur, together with intermediate forms. 



Sciuropterus volans (Linn.). Type locality — Virginia. Description as previously 

 given. 



Sciuropterus v. querceti Bangs. (Proc. Biol. Soc. Wash., X, 1896, p. 166.) Type 

 locality — Citronelle, Citrus Co., Florida. Similar to volans, but upper parts 

 more uniform russet and under parts washed with russet. 



Sciuropterus sabrinus (Shaw). Type locality — Severn River, Keewatin, Canada. 

 Description given elsewhere. 



Sciuropterus s. macrotis Mearns. (Proc. U. S. Nat. Mus., XXI, 1898, p. 353.) 

 Type locality — Hunter Mountain, Catskill Mountains, Greene Co., New York. 

 Smaller than sabrinus, more reddish in color and with longer ears. 



Sciuropterus silus Bangs. (Proc. Biol. Soc. Wash., X, 1896, p. 163.) Type locality 

 — Katis Mountain, White Sulphur Springs, West Virginia. Somewhat re- 

 sembles sabrinus, but is darker and decidedly smaller. Length of type 214 mm. 

 (about 8>^ inches) as given by Bangs. 



