(586) Geocichla sibirica davisoni.
Turdulus davisoni Hume, S. F., v, p. 63 (1877) (Muleyit).
Vernacular names. Mamie-jiro, Torat nigumi (Japan.).
Description.— Adult male. Similar to the Siberian Ground-Thrush but blacker and without any white tips to the under tail-coverts or with these tips very narrow and the abdomen all slaty grey.
Colours of soft parts as in the preceding bird.
Measurements. About the same as in the preceding bird ; wing 119 to 128 mm.; tail 87 to 90 mm.
Distribution. Breeding in Japan and migrating South in winter to China, the Indo-Chinese countries, Burma and Assam.
Nidification. Davison's Ground-Thrush breeds in great numbers in Japan, where the late Alan Owston obtained many nests and eggs. It lays in May and June, making a rather massive, untidy nest of grass, dead leaves and roots, lined with mud and with an inner lining of coarse grass and roots. As a rule the nest is placed in a low tree, often a fruit-tree in an orchard, between 5 and 20 feet from the ground. The eggs, which number four or five, are very pale in ground-colour, varying from bluish white to pale cream or stone-colour, the latter quite exceptional. The markings consist of specks and speckles rather sparsely scattered all over the surface of the egg like those of a weakly-marked Blackbird's egg. Erythristic eggs are rare, and equally rare are those like washed-out specimens of eggs of the Missel-Thrush. Sixty eggs average 29.5 x 20.8 mm.: maxima 33.0 x 21.2 and 28.4 x 23.0 mm.; minima 26.3 x 20.0 and 28.0 x 19.3 mm.
Habits. Apparently very much the same as those of our Indian Ground-Thrushes. They seek their food almost entirely 'on the ground and keep to well-wooded country and forest, but Mr. Owston informed me that they are not particularly shy or secretive birds and also that, unlike our Geocichlas, they have a sweet, full-toned song.
Geocichla citrina Lath., 1790.
Key to Subspecies.
A. Median wing-coverts broadly tipped with white.
a. Chin and throat chestnut like the
breast G. c. citrina, p. 148
b. Chin and throat white G. c. cyanotis, p. 150.
B. Median wing-coverts without white tips.
c. Chin and throat chestnut G. c. innotata, p. 151.
d. Chin and throat white G. c. albogularis, p. 153.
e. Chin white, throat chestnut G. c. anchmianensis,-p. 152.