The genus Suya comprises four Indian species, which are chiefly found on the hills and more rarely in the plains. They have greatly developed tails, which are always twice the Length of the wing or even longer. The spring moult is very complete, attended in the case of three species with a marked change of colour from that of the winter, and in the ease of one with a conspicuous alteration in the Length of the tail. One species undergoes no change of colour at the moults.
The Hill-Warblers are poor fliers and are resident species. They frequent low brushwood, but sometimes resort to the tops of low trees. They are closely allied to Prinia both in appearance and habits, but they have longer tails. They have two strong rictal bristles on each side, but no hairs in front of them; the whole of the feathers of the forehead being very firm, short, and smooth. The tail is greatly graduated, the outer feather either reaching to the middle of the tail or falling short of it.
The Hill-Warblers construct globular nests of grass in bushes near the ground, and lay spotted eggs.
Key to the Species.
a. Chin and throat white or fulvous white.
a1. Upper plumage very distinctly streaked.
a2. Sides of chin and throat and the whole breast irregularly barred……………..S. crinigera hiem., [p. 444.
b2. Sides of chin and throat and the whole breast unbarred……………..S. crinigera aestiv., [p. 444.
b1. Upper plumage plain or obsoletely streaked,
c2. Crown of same colour as back.
a3. Upper plumage olive-brown……………..S. atrigularis hiem., [p. 445.
b3. Upper plumage ferruginous-brown……………..& khasiana hiem., [p. 446.
d2. Crown of a darker colour than the back……………..S. superciliaris,
b. Chin and throat deep black. [p.447.
c1. Upper plumage dark olive-brown; the head tinged with ashy; black of throat continued over the breast and upper abdomen……………..S atrigularis aestiv., [p. 445.
d1. Upper plumage ferruginous brown; black confined to chin and throat……………..S. khasiana ; aestiv., [p. 446.
* I am unable to identify Suya gangetica, Blyth, Ibis, 1867, p. 23