Cotyle sinensis, J. E. Gr.
89. :- Jerdon's Birds of India, Vol. I, p. 164; Butler, Guzerat; Stray Feathers, Vol. III, p. 432; Deccan, Stray Feathers, Vol. IX, p. 378 ; Murray's Vertebrate Zoology of Sind, p. 103 ; Swinhoe and Barnes, Central India ; Ibis, 1885, p. 60.
THE INDIAN SAND MARTIN.
Length, 4 to 4.7 ; expanse, 9.8 to 10.75 ; wing, 3.3 to 3.8; tail, 1.6 to 1.8; tarsus, 0.4; bill from gape, 0.42 to 0.47.
Bill black ; gape pale fleshy; irides dark-brown; feet brownish or dusky fleshy.
Above earthy grey-brown, darker on the crown; upper tail-coverts somewhat albescent; throat and breast pale-greyish ; crown, wings and tail dusky-brown; belly and lower tail-coverts white; tarsus not feathered, but with a small tuft.
The young birds have a more or less rufous tinge.
The Indian Sand Martin is common throughout the district, and breeds in holes in banks of rivers, from November to February, and even later. The nest-holes vary from eighteen to thirty-six inches in depth, according to the nature of the soil in which they are excavated; the nest is composed of fine grass, lined with feathers; the eggs, three in number, are pure white ovals, measuring 068 inches in length by about 0.48 in breadth.