928. Suya atrogularis atrogularis

(928) Suya atrogularis atrogularis Moore.
THE SIKKIM BLACK-THROATED HILL-WARBLER.
Suya atrogularis atrogularis, Fauna B. I., Birds, 2nd ed. vol. ii, p. 523.
This Hill-Warbler seems to be restricted to Sikkim and Western Nepal. Oates doubted it occurring in Nepal at all, but Stevens found it very common in Eastern Nepal in the Mai Valley, at elevations up to 7,000 feet, whilst in Sikkim he says “it is numerous as a resident breeding species in the Rungbong Valley at elevations of from 3,400'-6,500'.” Inglis obtained it on Jore- Pokhari at 7,400 feet, while I have a very fine series of nests and eggs obtained by Masson on the Singalila Range between 6,000 and 8,000 feet.
Gammie took four nests in the Chinchona Reserves between 4,500 and 5,000 feet during May and June. He remarks :—“The nests were all in open grassy country, in grass by the sides of low banks, and not a foot above the ground. They were globular, with a lateral entrance, composed of grass, and with a little moss about the dome. One I measured was 5.5 high and 4.5 in diameter externally ; internally the nest was 2.4 in diameter, and the cavity had a total height of 3.9, of which 2 inches was below the edge of the entrance.”
The nests sent to me by Masson and others, taken by Stevens, were all found in more or less open country, generally grassy sides of hills, mixed with low scrub. Occasionally a nest was found just inside forest, but in these cases they were apparently built in grass and bush-covered ravines, just where these debouched from the higher forest.
The nests agreed well with Gammie’s description, and the presence of a little half-dried moss built in with the grass seems to be a feature of the nest-building of this species. The rather massive nest made almost entirely of the flowering ends of grasses, compactly held together by grass-stems, though occurring, is not a common type of nest with this race.
The breeding season seems to be May and June, all the eggs I have had sent me having been taken during these two months. The full complement of eggs is either four or five, but more often the former.
The eggs vary even more than those of the Criniger group and, whereas in that species the normal type of egg is the one with a pink ground, the common type in the atrogularis group is that with the pale greenish ground.
The following are among the types represented in my series :—
1. Pure white ground, freely speckled with bright reddish, the markings thickest in a ring round the larger end.
2. Faint pink ground, marked in same way, but more densely, with bright chestnut-red.
3. Almost white or dull cream, faintly blotched with pale reddish, with confluent rings of the same round the big end.
4. Pink or salmon-pink, blotched with deeper reddish all over and with the usual ring.
5. Bluish-white ground, speckled all over with reddish-brown ; no definite ring.
6. Pale blue, sparsely spotted with bright red. In this type some eggs are almost spotless.
7. Pale bright blue, boldly spotted and blotched deep red-brown ; ring very ill-defined.
8. Pale to comparatively dark dull greenish, profusely or thinly covered with tiny freckles of dull reddish ; the ring sometimes well defined, at others less marked.
Every shade of colour and marking between these definite types may be found, but the two main differences between the eggs of this group and those of the Criniger group are (1) the less bold definition of the ring and (2) the great preponderance of the green type.
One hundred eggs average 16.9 x 12.7 mm. : maxima 18.3 x 12.9 and 17.7 x 13.5 mm. ; minima 14.4 x 12.5 and 16.1 x 12.1 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: 
928. Suya atrogularis atrogularis
Spp Author: 
Moore.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
928
Year: 
1933
Page No: 
472
Common name: 
Black Throated Hill Warbler
M_ID: 
23767
M_SN: 
Prinia atrogularis atrogularis
Volume: 
Vol. 2
Term name: 
id: 
14033

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