148 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



ff. Larger, wing over 220 mm A. nisus 9 (extralimital) 



ee. Tail decidedly rounded. 



/. Underparts with little white, the breast uniform gray, the abdomen 

 rufous (sometimes with white margins to the feathers) 



(Cuba) A. gtmdlachi, adult (p. 180) 



ff. Underparts with much white, breast not uniform graj'. 



g. Underparts, including the breast and thighs, white and rufous 

 in transverse spots or bars (s. Canada to n. Mexico). 



A. cooperii, adult (p. 167) 

 gg. Underparts white, streaked with brown. 



h. Underparts with white predominating (s. Canada to n. 



Mexico) A. cooperii, immature (p. 169) 



hh. Underparts with brown predominating (Cuba). 



A, gvindlachi, immature (p. 180) 

 66. Black bands on tail not decidedly narrower than the paler interspaces, 

 c. Tail decidedly rounded (middle rectrices more than 10 mm. longer than 

 the outer rectrices). 

 d. Underparts gray, tibiae rufous. 



e. Under wing coverts white, rufous along the carpal band. 



/. Larger (wing 9 260 mm.), and darker (southeastern Mexico). 



A. bicolor fidens, adult (p. 166) 



ff. Smaller (wing, d", 209-217; 9 235-250 mm.), and paler (Yucatdn, 



through central America to Colombia, the Guianas and 



Amazonia) A. bicolor bicolor, adult (p. 163) 



ee. Under wing coverts not white. 

 /. Under wing coverts rufous. 



A. bicolor pileatus, adult (extralimital) *' 

 dd. Underparts white (sometimes with breast rufous), rich fawn color, or 

 pale rufous. 

 e. Breast and nuchal collar deep rufous, abdomen white, heavily barred 



with black A. pectoralis, adult cf ** (extralimital)" 



ee. Breast concolorous with abdomen, neither barred (Mexico to Brazil). 



A. bicolor, immature.^^ (p. 163) 

 cc. Tail square, or only slightly rounded (middle tail feathers less than 10 

 mm. longer than the outer ones). 



85Falco pileatus Temminck, Planches Col., livr. 35, 1823, pi. 205 (Brazil = Ilha 

 Cachoeirinha, Rio Belmonte, Bahia, fide Hellmayr, Publ. Field Mus., zool. 

 ser., xii, 1929, 458). — Cooperasiur pileatus Bonaparte, Rev. Mag. Zool., vi, 1854, 

 538. — Nisus pileatus Lesson, Man. d'Orn., i, 1828, 98; Schlegel, Mus. Pays-Bas, 

 Astures, 1862, 36. — Accipiter pileatus Sharpe, Cat. Birds Brit. Mus., i, 1874, 153; 

 Hand-li.st, i, 1899, 254; Swann, Synop. Accip., pt. 1, 1921, 61. — Accipiter bicolor 

 pileatus Swann, Monogr. Birds Prey, i, pt. 5, 1926, 334; Peters, Check-list Birds 

 of World, i, 1931, 217. 



86 No females or young seen, but females are said to be similar to males but 

 browner and paler above. 



" Falco pectoralis Bonaparte, Rev. Mag. Zool., 1850, 490 (Brazil). — Cooper- 

 asiur pectoralis Sclater, Ibis, 1861, 314, pi. 10; Sclater and Salvin, Nom. Av. 

 Neotr., 1873, 120. — Astur pectoralis Sharpe, Cat. Birds Brit. Mas., i, 1874, 121; 

 Swann, Synop. Accip., pt. 1, 1921, 45; Monogr. Birds Prey, i, pt. 4, 1925, 252. — 

 Dinospizias pectoralis Brabourne and Chvibb, Birds South Amer., i, 1912, 65. — 

 Accipiter pectoralis Peters, Check-list Birds of World, i, 1931, 218. 



8* Races indistinguishable in this plumage. 



