The Mexican gray squirrel (or red-bellied squirrel) (Sciurus aureogaster) is a tree squirrel in the genus Sciurus endemic to Guatemala and in eastern and southern Mexico, and is an introduced species in the Florida Keys, Cuba, Jamaica and Hispaniola.The alternate name of this squirrel (red-bellied squirrel) should not be confused with the Indonesian red-bellied squirrel (Rubrisciurus rubriventer) or the Asian red-bellied tree squirrel (Callosciurus erythraeus).The two subspecies each have many synonyms associated with them: The subspecies S.