Little Corporal Hawk, Falco temerarius, Nutt. Man. v. i. p. 61. Adult Male. Falco columbarius, Pigeon Hawk, Swains. & Rich. F. Bor. Amer. v. ii. p. 35. Falco Æsalon, Merlin, Swains. & Rich. F. Bor. Amer. v. ii. p. 37. Pigeon Hawk, Falco columbarius, Aud. Orn. Biog. v. i. p. 466; Young, v. i. p. 381, Male; v. v. p. 368. 22. 4. Falco sparverius, Linn. Sparrow Falcon.--Sparrow Hawk. Plate CXLII. Male and Female. Male with the upper part of the head and wing-coverts light greyish-blue, seven black spots round the head, and a light red patch on the crown; back light red, spotted with black; tail red, with a broad subterminal black band. Female with the head nearly as in the male, the back, wing-coverts, and tail, banded with light red and dusky. Young similar to the female, but with more red on the head, which is streaked with dusky. _Male_, 12. _Female_, 12. Generally distributed. Resident in the south. Abundant. American Sparrow-Hawk, Falco sparverius, Wils. Amer. Orn. v. ii. p. 117. Falco sparverius, Bonap. Syn. p. 27. American sparrow-hawk, Falco sparverius, Nutt. Man. v. i. p. 58. Falco sparverius, Little Rusty-crowned Falcon, Swains. & Rich. F. Bor. Amer. v. ii. p. 31. American Sparrow-Hawk, Falco sparverius, Aud. Orn. Biog. v. ii. p. 246; v. v. p. 370. GENUS X. ASTUR, Cuv. HAWK. Bill short, robust; its upper outline sloping, and nearly straight at the base, then decurved; cere short, bare above; edge of upper mandible with a festoon, succeeded by a broad sinus. Nostrils elliptical. Feet of moderate length; tarsi moderate or slender, feathered at least one-third of their length, broadly scutellate before and behind; first and second toes strongest and equal, third much longer, and connected at the base by a web with the third, which is shortest; claws long, well curved, acuminate. Wings very broad, of moderate length, much rounded, fourth and fifth quills longest, first much shorter, outer four abruptly cut out on the inner web. Tail long, much exceeding the wings, rounded. Those of more slender form, with proportionally longer tails and tarsi, are separated by many authors to form a group, to which the name of _Accipiter_ and _Nisus_ are given. 23. 1. Astur palumbarius, Linn. Gos Hawk. Plate CXLI. Fig. 1. Adult Male. Fig. 2. Young. Adult male dark bluish-grey above, the tail with four broad bands of blackish-brown, the upper part of the head greyish-black; a white band, with black lines, over the eyes; lower parts white, narrowly barred with grey, and longitudinally streaked with dark brown. Young brown above, the feathers edged with reddish-white, the head and hind neck pale red, streaked with blackish-brown, the lower parts yellowish-white, with oblong longitudinal dark brown spots. _Male_, 24, 47. From Maryland, northward. From Kentucky, northward. Migratory.