Falco aesalon, Tunst.
15. :- Hypotriorchis aesalon, Gm. :- Jerdon's Birds of India, Vol. I, p. 35; Murray's Vertebrate Zoology of Sind, p. 7; Hume's Scrap Book, p. 89.
Length, 11.25 ; wing, 8 ; tail, 5.
Length, 13.5 ; wing, 9 ; tail, 5.5.
Above, fine blackish-grey, darkest on the crown, and reddish, mixed with white, on the nape ; ear-coverts yellowish-grey ; quills blackish-brown; tail grey, with a broad black band, white-tipped at the end; chin and throat white, the same tinged with ochrey on the breast and with reddish-orange on the abdomen, with dark brown spots. The female is browner than the male, with the markings more rufous, and the lower parts ochrey-white, tinged with rufous on the breast, and the spots larger and more numerous.
The young bird has the head rufous, with dark streaks ; and the rest of the plumage above brown, tinged grey, with dark shafts, and pale rufous edges; quills dark brown ; tail ashy-brown, barred with rufous; the chin is white, the rest of the plumage beneath pale ochrey-white, with broad brown marks reduced to lines on the thighs and under tail-coverts.
The Merlin is another very rare visitant to Sind.