_Description._--Above dull slaty blackish, rump variegated with white; superciliaries lengthened and joined behind on the nape rufous: beneath, throat and breast pale cinnamomeous with black shaft-stripes on the breast; broad band across the belly black, with slight white transverse lines; lower belly and thighs clear cinnamomeous; wings and tail blackish with transverse white bars; bill yellow with black tip; feet orange, claws black: whole length 13·5 inches, wing 10·0, tail 7·0. _Female_ similar, but larger. _Hab._ Central and South America. The Orange-chested Hobby is found throughout South and Central America, but the form met with here differs, to some extent, in habits from its representatives of the hotter region. It is a Patagonian bird, the most common Falcon in that country, and is migratory, wintering in the southern and central Argentine provinces. In its winter home it is solitary, and fond of hovering about farm-houses, where it sits on a tree or post and looks out for its prey. Compared with the Peregrine it has a very poor spirit, and I have often watched it give chase to a bird, and just when it seemed about to grasp its prey, give up the pursuit and slink ingloriously away. It never boldly and openly attacks any bird, except of the smallest species, and prefers to perch on an elevation from which it can dart down suddenly and take its prey by surprise. The nest is a slovenly structure of sticks on a thorny bush or tree. The eggs, which I have not seen, Darwin describes as follows:--"Surface rough with white projecting points; colour nearly uniform dirty wood-brown; general appearance as if it had been rubbed in brown mud." 305. TINNUNCULUS CINNAMOMINUS (Sw.). (CINNAMOMEOUS KESTREL.) +Falco sparverius+, _Burm. La-Plata Reise_, ii. p. 437 (Mendoza, Tucuman); _Barrows, Auk_, 1884, p. 110 (Entrerios). +Tinnunculus sparverius+, _Darwin, Zool. 'Beagle,'_ iii. p. 29 (Rio Negro); _Scl et Salv. Nomencl._ p. 121; _iid. P. Z. S._ 1868, p. 143 (Buenos Ayres); _Hudson, P. Z. S._ 1872, p. 536 (Rio Negro); _Durnford, Ibis_, 1877, p. 39 (Chupat), p. 188 (Buenos Ayres), et 1878, p. 398 (Centr. Patagonia); _Gibson, Ibis_, 1879, p. 412 (Buenos Ayres). +Cerchneis cinnamomina+, _Sharpe, Cat. B._ i. p. 439. +Tinnunculus cinnamominus+, _Withington, Ibis_, 1888, p. 470 (Lomas de Zamora).