(590) Geocichla citrina andamanensis.
The Andaman Ground-Thrush.
Geocichla andamanensis Wald., A. M. N. H., (4) xiv, p. 156 (1874) (Andamans); Blanf, & Oates, ii, p. 142.
Vernacular names. None recorded.
Description.— Adult male. Differs from G. c. citrina in having the chestnut everywhere much richer and deeper and in having the chin white or whitish and the centre of the throat inclined to be albescent. There are nearly always distinct signs of two cheek-bars representing the blackish bars on cyanotis.
Colours of soft parts as in G. c. citrina. The base of the bill according to Davison is sometimes pale plumbeous.
Measurements. Wing 100 to 107 mm.; tail 70 to 71 mm.; tarsus 30 to 31 mm.; culmen about 20 mm.
Female has the blue-grey of the upper parts replaced by olive-green as in the other races.
Colours of soft parts as in the male.
Measurements practically the same as in the male.
Nestling as in the Orange - headed Ground - Thrush but darker.
Distribution. The Andaman Islands only.
Nidification. Breed commonly in the Andamans during May and June, during which month many nests were found by Messrs. B. B. Osmaston, P. Wickham and A. Anderson. The nest and eggs are not distinguishable from those of the Indian bird but perhaps the latter are not quite so richly coloured. Fifty eggs average 25.2 x 18.7 mm.: maxima 27.Ox 18.0 and 25.7 X 19.3 mm.; minima 23.0 x 18.6 and 26.0 x 17.6 mm.
Habits. Similar to those of the other races.