Geocichla Kuhl, ? Dutch periodical, 1836. Type, Geocichla interpret.
The genus Geocichla contains some Thrushes very closely allied to the genus Turdus, but the axillaries and under wing-coverts instead of being unicoloured are of two contrasting colours transposed in position on the two. It also differs from Turdus in having both the wing and tail comparatively shorter and, as we should expect from the former, the birds of this genus are normally resident and not migratory, though some of them wander in the Winter a good deal and all move to some extent vertically with the seasons.
They are ground-birds in their habits and their song is crude and quite unlike that of the Tree-Thrushes and Blackbirds. The sexes are dissimilar.
Key to Species.
A. No chestnut on lower plumage.
a. Upper tail-coverts margined with white ,... G. wardi, p. 145.
b. No white on upper tail-coverts G. sibirica, p. 140
B. Lower plumage almost entirely chestnut G. citrina, p. 148.
The species G. citrina is divided into many local races which have hitherto been given the status of species, but they all grade the one into the other and are no more sharply differentiated from one another than the races of many species which have hitherto been ignored altogether.