(503) Oreicola ferrea haringtoni.
The Eastern Dark-grey Busk-Cieat.
Oreicola ferrea haringtoni Hartert, Vog. Pal. Fauna, i, p. 711 (1910) (Moupin).
Vernacular names. None recorded.
Description. Only differs from the Western Dark-grey Bush-Chat m being whiter below at all seasons of the year, in summer the breast and abdomen are almost pure white.
Measurements. Wing 04 to 68 mm.; tail 51 to 63 mm. If the tail is measured from the base this adds four or five mm. to the length and makes them agree with Hartert's for both species included.
Distribution. Hills of China, Yunnan, Kachin, and Chin Hills. The birds from South Assam are 0. ferrea ferrea and they only breed occasionally on that side of the Brahmaputra, nearly all of them crossing the river to breed to the North in Nepal and Sikkim etc.
Nidification. Similar to that of Oreicola ferrea ferrea but the eggs, taken as a series, are very different. The ground-colour is a brighter, deeper blue and, whilst in many eggs the .markings are entirely absent, in none are they numerous enough, or sufficiently well defined, to make the eggs look anything but bright blue. Forty eggs average 18.4 x14.4 mm.: maxima 19.8 x 14.5 and 19.1 x 15.0 mm,; minima 17.1 X14.2 and 18.2 x 14.0 mm.
The principal breeding months are April and May.
Habits. Those of the preceding race but the Eastern form seems to be found more often in scrub and thin bush cover than is the Western.