BIRDS OF NORTH AND MIDDLE AMERICA 565 



cc. Throat and breast not tawny cinnamon to tawny chestnut, but whitish, 

 grayish, or pale grayish brown. 

 d. Chin and upper throat pale grayish; the rest of the underparts whitish 

 or pale buflfy white, with fine wavy blackish lines across the breast 



and upper abdomen M. gilvicollis (extralimital)" 



dd. Chin and throat whitish or grayish brown, or, if grayish, the underparts 

 heavilytbanded with black, 

 e. Under surface of body white banded with black. 

 /. Throat dull grayish brown; an irregular white nuchal collar 

 present M. ruficollis zonothorax (extraUmital)^^ 



Synopt. List Accipt., pt. 1, 1919, 16; Synop. Accip., pt. 1, 1921, 25 (c. and e. 

 Brazil; Paraguay; n. Argentina). — Clamosocirciis ruficollis Swann, Monogr. Birds 

 Prey, i, 1925, 145 (monogr.). — Falco xanthothorax Spix, Av. Bras., i, 1824, 19 

 (prov. Rio de Janeiro, Brazil) ; Temminck, Planches Col., i, 1824, pi. 92 and text. — 

 Astur xanthothorax Stephens, in Shaw's Gen. ZooL, xiii, pt. 2, 1826, 27, part 

 (Brazil).— iVzSMS xanthothorax Lesson, Man. Orn., i, 1828, 96; Traits d'Orn., 

 1831, 58; Cuvier, Regne Anim., ed. 2, i, 1829, 334; Schlegel, Mus. Pays-Bas, ii, 

 No. 4, livr. 1, 1862, 50 (monogr.). — Circaetus xanthothorax Kaup, Isis, 1847, 259 

 (monogr.), 368 in Jardine's Contr. Orn., 1850, 71. — Micrastur xanthothorax Gray, 

 Gen. Birds, ed. 1, 1844, suppressed, and ed. 2, 1844, 28; Pelzeln, Reis. Novara, 

 Vog., 1865, 12; List Spec. Brit. Mus., pt. 1, Accip, ed. 2, 1848, 69; Pelzeln, 

 Orn, Bras., Abth. 4, 1871, 399; Bonaparte, Consp. Gen. Av., i, 1850, 30; Rev. Mag. 

 ZooL, vi, 1854, 537. — Falco leiicauchen Temminck, Planches Col., i, 1824, pi. 

 306, and text (Brazil; juvenal) ; Pucheran, Rev. ZooL, 1852, 91 (crit.) ; Hellmayr, 

 Nov. ZooL, xxviii, 1921, 180 (crit. on type specimen). — Astur leucauchen Lesson, 

 Man. d'Orn., i, 1828, 9; Cuvier, Regne Anim., ed. 2, 1829, 332. — Nisus leucauchen 

 Lesson, Trait6 d'Orn., 1831, 60. — Thrasyaccipiter seminocturnus Bertoni and 

 Bertoni, An. Cien. Paraguayos i. No. 1, 1901, 164 (forests of the Alto Parand).— (?) 

 Accipiter virgatus (not Falco virgatus Temminck, 1822) Bertoni and Bertoni, An. 

 Cien. Paraguayos, i. No. 1, 1901, 163 (Djaguarasapa, Paraguay). 



" Sparvius gilvicollis Vieillot, Nouv. Diet. Hist. Nat., x, 1817, 323; Pucheran, 

 Rev. Mag. ZooL, 1850, ^\.— Astur xanthothorax Stephens, in Shaw's Gen. ZooL, 

 xiii, pt. 2, 1826, 27, part (Guiana, etc.).— Nisus concentricus Lesson, Trait6' 1831, 

 60 (ex lUiger.MS.; Cayenne); d'Orbigny, Voy Amer. M6rid., Ois, 1837, 88; 

 Schlegel, Mus. Pays-Bas, Astures, 1862, 51.— Climacocercus concentricus Cabanis, 

 in Tschudi, Fauna Peruana, Vog., 1844, 98; in Schomburgk's Reis. Brit. Guian., 

 iii, 1848, 738; Burmeister, Th. Bras., ii, 1855, 8Q.— Micrastur concentricus Gray, 

 Gen. Birds, 1849, 28; Pelzeln, Orn. Bras., 1871, 7, 399.— Micrastur gilvicollis 

 Pelzeln, Reis. Novara, Vog., 1865, 10; Orn. Bras., 1871, 7, 399; Sharpe, Cat. 

 Birds Brit. Mus., i, 1874, 78; Gurney, Ibis, 1875, 232; List Diurnal Birds Prey, 

 1884, 25, 121; Swann, Synopt. List Accip., 1919, 16.— Micrastur pelzelni Ridgway, 

 Proc. Acad. Nat. Sci. Philadelphia, 1875, 494 (Sarayacu); Ibis, 1876, 4; Tacza- 

 nowski, Orn. P6rou, i, 1884, 161.' — Micrastur ruficollis gilvicollis Sclater, Ibis, 

 1918, 346; Peters, Check-hst Birds of World, i, 1931, 278.— Climacocerciis gilvicollis 

 Cabanis, Journ. ftir Orn., 1865, 407; Swann, Synopt. List Accip., 1919, subst. p. 

 16; Synop. Accip., pt. 1, 1921, 26.' — Clamosocircus gilvicollis Swann, Monogr. 

 Birds Prey, i, 1925, 149 (monogr.). 



88 Climacocercus zonothorax Cabanis, Journ. fiir Orn., 1865 (publ. Jan, 1866), 

 406 (Puerto Cabello, Venezuela) ; Swann, Synopt. List Accip., pt. 2, 1919, Addenda 

 et Corrigenda (part 1), p. 16; Synop. Accip., pt, 1, 1921, 26; Auk, xxxviii, 1921, 



