Prinia stewarti.
Stewart's Wren-Warbler is one of those forms in regard to which at present great difference of opinion prevails as to whether or no they merit specific separation. P. stewarti from the N.W. Provinces and P. socialis from the Nilghiris differ only in size; the latter is somewhat more robust, and probably weighs one fifth more than the former. But then in the Central Provinces you meet with intermediate sizes, and I have plenty of birds which might be assigned indifferently to either race as a rather small example of the one or rather large one of the other. I myself consider all to belong to one species, but as this is not the general view I have kept my notes on their nidification separate.
This species or race breeds almost throughout the plains of Upper India and in the Sub-Himalayan ranges to an elevation of 3000 or 4000 feet. In the plains the breeding-season extends from the first downfall of rain in June (I have never found them earlier) to quite the end of August. In the moist Sub-Himalayan region, the Terais, Doons, Bhaburs, and the low hills, they commence laying nearly a month earlier.
This species often constructs as neatly sewn a nest as does the Orthotomus; in fact, many of the nests built by these two species so closely resemble each other that it would be difficult to distinguish them were there not very generally a difference in the lining. With few exceptions all the innumerable nests of O. sutorius that I have seen were lined with some soft substance—cotton-wool, the silky down of the cotton-tree(Bomlax heptaphyllum) grass-down, soft horsehair, or even human hair, while the nests of P. stewarti are almost without exception lined with fine grass-roots.
Our present bird does not, however, invariably construct a "tailored" nest. When it does, like O. sittorius, it sews two, three, four, or five leaves together, as may be most convenient, filling the intervening space with down, fine grass, vegetable fibre, or wool, held firmly into its place by cross-threads, sometimes composed of cobwebs, sometimes made by the bird itself of cotton, and sometimes apparently derived from unravelled rags. It also, however, often makes a nest entirely composed of fine vegetable fibre, cotton, and grass-down, and lined as usual with fine grass-roots. Sometimes these nests are long and purse-like, and sometimes globular, either attached to, or pendent from, two or more twigs. One nest before me, a sort of deep watch-pocket, suspended from five twigs of the jhao (Tamarix dioica), measures externally 2·75 inches in diameter, is a good deal longer at what may be called the back than the front, and at the back fully 5·5 long. Internally the diameter is about 1·5, and the cavity, measuring from the lowest portion of the external rim, is 2·5. This is a very large nest. Another, built between three leaves, has an external diameter of about 2½ inches, and is externally not above 3 inches long. It is unnecessary here to describe the beautiful manner in which, when it makes use of leaves, this bird sews them together, as this has already been well described by others where O. sutorius is concerned, and P. stewarti is, in some cases, when forming a nest with leaves, fully as neat a workman.
The nests vary so much, and I have heard so much, discussion about them, that having seen at least a hundred and having taken full notes of some twenty of them, I shall reproduce a few of these notes:—
"Agra, July 17th.—Two nests—one nearly globular, composed entirely of fibrous roots, hair, wool, and thread, and lined with fine grass, suspended by a few fibres and hairs between the fork of a branchlet in a little dense bush of Indian box; the other, suspended from the tendril of an elephant creeper, was principally formed by one of the leaves of this, to which, to form the remaining third of the exterior, a second leaf of the same plant was carefully sewn. Interiorly there was a little wool, and at the bottom fine grass.
"July 20th.—On a furash-tree (Tamarix furas), beautifully made of fine soft wool, shreds of tow and string, very fine grass and grass-roots, and the bottom neatly lined with very fine grass-roots. In shape the nest is like one half of a long old-fashioned silk purse, round-bottomed and very compact, with a long slit-like opening on one side towards the top. It contained five eggs.
"July 26th.—Two nests, one formed almost entirely in a single mango-leaf, the sides of which are curled round so as nearly to meet, and then laced by a succession of cross-threads of cobweb, carefully knotted at each place where the margin of the leaf is pierced. The intervening space is closed by fine tow, wool, and the silky down of the cotton-tree, with just the top of a small mango-leaf caught in from above so as to form an arched roof. The other nest was rounder in form, having less of a leafy structure. It had, however, the leaf of the Phalsa forming the back and sides (partly), whilst the whole of the front was composed of soft wool, tow, dry grass-roots, thread, and a few pieces of the soft tree-cotton. It had a neighbouring leaf just caught in on one side. This contained four fresh eggs.
"July 30th.—A beautiful nest between three twigs, several of the leaves of each of which had been tacked on to the outside of the nest. The nest itself was firmly put together with fine grass-roots, and was nearly globular in shape, with one side continued upwards into a sort of hood overhanging the greater portion of the aperture. It contained four eggs of the usual deep red colour.