(883) Acanthopneuste trochiloides trochiloides.
Blyth's Crowned Willow-Warbler.
Acanthiza trochiloides Sundev., Physio. Sallskapets Tidsk., i (1838) (Calcutta). Acanthopneuste trochiloides. Blanf. & Oates, i, p. 419.
Vernacular names. None recorded.
Description. Similar to A. o. occipitalis but darker and greener than either that bird or A. o. coronata, darker and more yellow below, smaller and with a different wing-formula. The outer tail-feathers nearly always have a white tip and edge to the inner web, these white markings sometimes extending to the three outer pairs.
Colours of soft parts as in A, o. occipitalis.
Measurements. Total length about 120 mm.: wing 51 to 61 mm.; tail 31 to 43 mm.; tarsus 16 to 17 mm.; culmen about 9 mm.
Distribution. Breeding from Afghanistan frontier through Gilgit and Kashmir to Garhwal, Nepal, Sikkim and Tibet. Winters in Bengal, Assam, Burma to Tenasserim.
Nidification. This Willow-Warbler breeds throughout the North-West Himalayas between 7,000 and 10,000 feet. Col. Rattray describes the nest and eggs as being very similar to those of A. o. occipitalis, but the birds are much more quiet and secretive and do not give away the site of their nest so readily. The eggs are pure white and twenty-five average 15.9 x 12.0 mm.: maxima 17.1 x 12.2 and 16.1 x 12.3 mm.; minima 14.4 X11.7 and 14.6 x 11.2 nun. The birds breed during May, June and July.
Habits. Those of the genus. So far as is recorded and according to my own experience, this Warbler is strictly arboreal, hunting for insects very high up in tall trees. I have never seen it hawking for insects on the wing.