Monticola cyaneus, Lin.
351. :- Petrocossyphus cyaneus, Lin. :- jerdon's Birds of India, Vol. I, p. 511; Gyanocincla cyana, Lin.; Butler, Guzerat; Stray Feathers, Vol. III, p. 470 ; Deccan, Stray Feathers, Vol. IX, p. 398 ; Murray's Vertebrate Zoology of Sind, p. 129 ; Swinhoe and Barnes, Central India; Ibis, 1885, p. 67.
THE BLUE ROCK THRUSH.
Length, 8.5 to 9 ; expanse, 13 to 14.5 ; wing, 4.5 to 5 ; tail, 3.1 to 3.8 ; bill at front, 0.7 to 0.9 ; bill from gape, 1.25.
Bill black ; irides brown; legs black.
Male throughout of a dull indigo-blue, more or less marked with dusky, and the feathers of the abdomen, vent, and under tail-coverts, pale tipped, in some specimens with a tinge of deep ferruginous on the feathers of these parts.
The female is dingy greyish-brown, with a faint blue or ashy tinge, greyish on the tail; some of the feathers edged with whitish, and the under parts fulvescent-greyish, with dusky cross bands, some being rufescent on the lower parts, especially on the vent and under tail-coverts.
The Blue Rock Thrush is a common winter visitant throughout the region, arriving during October and leaving about April ; it is very solitary in its habits, and appears to frequent the same locality, not only throughout the season, but for several successive ones Jerdon records that " it is supposed to be the sparrow of our English version of the Scriptures that sitteth alone on the house tops."