885. Acanthopneuste reguloides davisoni

(885) Acanthopneuste reguloides davisoni Oates.
THE TENASSERIM WHITE-TAILED WILLOW-WARBLER.
Acanthopneuste trochiloides davisoni, Fauna B. I., Birds, 2nd ed. vol. ii, p. 482.
Acanthopneuste reguloides davisoni, ibid. vol. viii, p. 462.
This Willow-Warbler extends from the mountains of Tenasserim at least as far North as Karenni and, probably, throughout the hills of Northern Burma.
Harington, Grant and Hopwood all obtained nests in the Bhamo Hills which they attributed to this subspecies, while in the Chin Hills both Mackenzie and Hopwood took many nests supposed to belong to it. I have, however, seen no specimens of birds from Northern Burma, and they may prove to be harterti rather than davisoni. On the other hand, a specimen obtained by Forrest in Yunnan seems to be a quite typical davisoni.
Davison obtained the nest of this Warbler in Tenasserim and records (Hume’s ‘Nests and Eggs,’ vol. i, p. 269) “In a deep ravine close below the summit of Mooleyit I found a nest of this Willow-Warbler. It was placed in a mass of creepers growing over the face of a rock about 7 feet from the ground. It was only partially screened, and I easily detected it on the bird leaving it.
I was very much astonished at finding a nest of a Willow-Warbler in Burma, so I determined to make positively certain of the owner of the nest. I marked the place and, after a short time, returned very quietly. I got within a couple of feet of the nest ; the bird sat still and I watched her for some time ; the markings on the top of the head were very conspicuous. On my attempting to go closer the bird flew off. I moved back a short distance and shot her, using a very small charge.
“The nest was a globular structure, with the roof slightly pro¬jecting over the entrance. It was composed externally chiefly of moss, intermingled with dry leaves and fibres ; the egg-cavity was thickly and warmly lined with a felt of pappus.
“The external diameter of the nest was about 4 inches ; the egg-cavity 1 inch at the entrance and 2 inches deep.
“The nest contained three small pure white eggs.”
A nest taken for me by Partridge in 1903 was exactly similar but had a hning felted of moss and white cottony-down.
Nests taken by Hopwood and Mackenzie in the Chin Hills between 4,000 and 7,000 feet were generally placed in natural hollows low down in trees and are described as “a pad of pappus and moss or of grass lined with pappus and moss.”
A nest taken by Cook in Ataran was a ball of moss, lined with pappus and placed “on the sloping bank of a mossy forest." Another, taken by Hopwood in Myitkyina, was an oval, “almost on the ground, of green moss with a few roots, hairs and fibres intermixed.” The breeding season is April and May in the North of Burma, one nest being taken on the 5th July with four fresh eggs. In Tenasserim Davison took his nest on the 2nd February, Cook his on the 14th April and Partridge his on the 30th May, at a place called Ko-hang.
The full clutch is three or four and the eggs cannot, of course, be distinguished from those of the other races, though my small series of eggs are rather broad and stumpy in shape.
Twenty-six eggs average 14.9 x 11.9 mm. : maxima 16.3 x 12.0 and 16.2 x 12.3 mm. ; minima 13.0 x 11.8 and 13.4 x11.1 mm.

BookTitle: 
The Nidification Of Birds Of The Indian Empire
Reference: 
Baker, Edward Charles Stuart. The nidification of birds of the Indian Empire. Vol. 2. 1933.
Title in Book: 
885. Acanthopneuste reguloides davisoni
Spp Author: 
Gates.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
885
Year: 
1933
Page No: 
432
Common name: 
Tenasseeim White Tailed Willow Warbler
M_ID: 
23053
M_CN: 
Davison's Leaf Warbler
M_SN: 
Phylloscopus davisoni
Volume: 
Vol. 2
id: 
13997

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