Face black, with flesh-coloured spots; the body entirely white, faintly
washed with yellow; the base of the tail washed with rust-red. It is of the
same size as the type-form, and appears to be only an albino variety.
Specimens showing every gradation in coloration between that of the type
and the absolute albino are now well known. This form, however, is more or
less restricted to the narrow belts of forest on the eastern side of the
mountains in the north-east of Madagascar, between the rivers Lokoi and
Bemarivo, a region conterminous with that inhabited by the typical species.