Microsciurus J. A. Allen, 1895
Microsciurus alfari subsp. alfari J. A. Allen, 1895
Microsciurus alfari subsp. alticola Goodwin, 1943
Microsciurus alfari subsp. browni Bangs, 1902
Microsciurus alfari subsp. fusculus Thomas, 1910
Microsciurus alfari subsp. septentrionalis Anthony, 1920
Microsciurus alfari subsp. venustulus Goldman, 1912