Head and body length is 90-110 mm and tail length is about 100 mm.
Females are smaller than males.
The upper parts are grayish brown to brown, and the underparts are usually hazel. Individuals from French Guiana have a reddish head and black outer ear tips. This squirrel lives in the tops of trees within tall forests on dry ground. It is extremely agile. The diet consists of fruits, nuts, bark, and resin.