From Wikipedia...

"The flying squirrels, scientifically known as Pteromyini or Petauristini, are a tribe of squirrels (family Sciuridae). There are 43 species in this tribe, the largest of which is the woolly flying squirrel (Eupetaurus cinereus). The two species of the genus Glaucomys (Glaucomys sabrinus and Glaucomys volans) are native to North America, and the Siberian flying squirrel is native to parts of northern Europe (Pteromys volans)."

I would imagine this one was a Pteromys volans chatticus mohawkicus.