_Falco pennsylvanicus_, WILS. Am. Orn. VI, 92, pl. liv, f. 1, 1812.—LATH. Gen. Hist. I, 263, 1821.—AUD. B. Am. pl. xci, 1831; Orn. Biog. I, 461, 1831.—BONAP. Ann. Lyc. N. Y. II, 29, 434; Isis, p. 1137, 1832.—NUTT. Man. I, 105, 1833.—TEMM. Pl. Col. 67, 1836. _Buteo pennsylvanicus_, BONAP. Ois. Cuv. Règ. An. p. 35, 1830; Eur. & N. Am. B. p. 3, 1838; Consp. Av. p. 19, 1850.—AUD. Syn. p. 7, 1839.—BREW. (WILS). Am. Orn. Syn. p. 648, 1852.—GRAY, Gen. sp. 8, 1844; List B. Brit. Mus. p. 16, 1844.—CASS. B. Cal. & Tex. Syn. p. 100, 1854.—STRICKL. Orn. Syn. I, 32, 1855.—DE KAY, Zoöl. N. Y. II, 11, pl. v, fig. 11, 1844.—CASS. Birds N. Am. 29, 1858.—GRAY, Hand List, B. 7, 1869.—DRESSER, Ibis, 1865, 325 (Texas). _Astur pennsylvanicus_, CUV. Règ. An. (ed. 2), I, 332, 1829.—JAMES. (WILS.) Orn. I, 65. _Falco latissimus_, WILS. Am. Orn. (last ed.) VI, 92, pl. liv, f. 1, 1812. _A. ? latissimus_, JARD. (WILS.) Am. Orn. II, 294. _Falco wilsoni_, BONAP. Obs. Wils. Nouv. Journ. Ac. Sc. N. Y. III, 348. _Pœcilopternis wilsoni_, KAUP, Mon. Fal. Cont. Orn. p. 75, 1850. _Sparvius platypterus_, VIEILL. Enc. Méth. III, 1273 (quot. Wils. pl. liv, fig. 1), 1823. SP. CHAR. _Adult._ Upper surface dark umber-brown, the feathers gradually paler toward edges; on the back, the feathers more uniformly dusky, causing a prevalent blackish appearance. Rump and upper tail-coverts blackish vandyke-brown; the latter tipped with pure white, and with a concealed bar of same, about the middle of each feather. Tail dull black, with an obscure terminal band of dull brown, this fading terminally into whitish; across the middle of the tail a broad band of dull light umber (in some individuals approaching dull white) about ¾ of an inch in width; about as far anterior to the main band as this is from the tip is another much narrower and more obscure band of the same color, crossing just beyond the ends of the coverts, or concealed by them. Primaries uniform brownish-black, fading on terminal edge into pale brown. Head above, and broad but inconspicuous “mustache,” running from beneath the lore downward across the cheek, dull black; the crown posteriorly, with the occiput and nape, having the dull black much broken, caused by the lateral streaks of dull rufous on all the feathers; this dull rufous tint prevails on the rest of the head and neck, as well as the breast, leaving the lores and chin and lateral portion of frontlet alone whitish; throat streaked with blackish. Beneath dull brownish-rufous; that of the breast almost unvaried; medially, however, are roundish spots of white on opposite webs, but these are not confluent; posteriorly these spots become gradually more numerous and more transverse, forming on the flanks transverse bands, almost continuous; on the tibiæ the white prevails, the rufous bars being more distant, and connected only by a brown shaft-line; lower tail-coverts less numerous, transverse spots of dull rufous. Lining