_Falco cooperi_, BONAP. Am. Orn. pl. x, fig. 1, 1825; Ann. Lyc. N. Y. II, 433; Isis, 1832, 1137.—JAMES. (WILS.) Am. Orn. IV, 1831, 3.—PEAB. B. Mass. III, 78. _Accipiter cooperi_, GRAY, List B. Brit. Mus. 38, 1844; Gen. B. fol. sp. 6.—CASS. Birds Cal. & Tex. p. 96, 1854; Birds N. Am. 1858, 16.—SCLAT. Pr. Z. S. 1859, 389 (difference from _A. pileatus_, MAX.).—HEERM. P. R. R. Rep’t, VII, 31, 1857.—COOP. & SUCKL. P. R. R. Rep’t, XII, ii, 145, 1860.—COUES, Prod. Orn. Ariz. p. 7, 1866.—DRESSER, Ibis, 1865, 323 (Texas).—BLAKIST. Ibis, III, 1861, 317.—SCL. & SALV. Ex. Orn. I, 1869, 170.—GRAY, Hand List, I, 32, 1869. _Astur cooperi_, JARD. (WILS.) Am. Orn. III, 363, 1832.—BONAP. List, p. 5; Rev. Zool. 1850, 489; Consp. Av. 31.—DE KAY, Zoöl. N. Y. II, 18, pl. iv, p. 5.—NEWB. P. R. R. Rep’t, VI, iv, 74, 1857.—MAX. Cab. Journ. VI, 1858, 13. _Falco stanleyi_, AUD. B. Am. pls. xxxvi, cxli; Orn. Biog. I, 186. _Accipiter pileatus_ (not of MAX.!), STRICKL. Orn. Syn. I, 109, 1855. _Accipiter cooperi_, BREWER, Oölogy, 1857, 20, pl. v, f. 55. SP. CHAR. _Adult male_ (No. 10,086). Forehead, crown, and occiput blackish-plumbeous; the latter snowy-white beneath the surface; rest of upper parts slaty-plumbeous, the nape abruptly lighter than the occiput; feathers of the nape, back, scapulars, and rump with darker shaft-lines; scapulars with concealed cordate and circular spots of white; upper tail-coverts sharply tipped with white. Tail more brownish than the rump, sharply tipped with pure white, and crossed with three broad, sharply defined bands of black, the first of which is concealed, the last much broadest; that portion of the shaft between the two exposed black bands white. Lores grayish; cheeks and throat white, with fine, hair-like shaft-streaks of blackish; ear-coverts and sides of neck more ashy, and more faintly streaked. Ground-color beneath pure white; but with detached transverse bars of rich vinaceous-rufous, crossing the jugulum, breast, sides, flanks, abdomen, and tibiæ; the white bars everywhere (except on sides of the breast) rather exceeding the rufous in width; all the feathers (except tibial plumes) with distinct black shaft-lines; lower tail-coverts immaculate, pure white. Lining of the wing white, with numerous cordate spots of rufous; coverts with transverse blackish bars; under side of primaries silvery-white, purest basally (tips dusky), crossed with quadrate bars of dusky, of which there are six (the first only indicated) upon the longest quill (fourth). Wing, 9.20; tail, 7.80; tarsus, 2.35; middle toe, 1.60. Fourth quill longest; third shorter than fifth; second intermediate between sixth and seventh; first, 2.80 shorter than longest; graduation of tail, 1.00.