Ridgway.] 76 [May 21, 



and crescent curving upward behind the auriculars, 

 pure white. Adult. Above umber- or sepia-brown, the 

 top of the head usually darker. Beneath white, some- 

 times tinged with ochraceous, the breast more or less 

 washed with rufous, the whole surface, except the 

 throat and anal region, narrowly barred transversely 

 with blackish, the bars fainter in the reddish of the 

 breast. Young not seen. Hab. Brazil. 

 B. — Inner toe appreciably longer than the outer. Tail shorter than 

 the wing. 

 c. Wing less than 8.00 ; five outer primaries with inner webs 

 appreciably sinuated. 

 5. M. concentricus. Wing, 7.10-7.55 , tail, 6.30-6.50 ; 

 tarsus, 2.25-2.45. Adult. Above uniform plumbeous- 

 ashy, sometimes more bluish anteriorly, and without 

 a lighter nuchal collar. Beneath white, the crissum 

 and anal region immaculate ; other portions trans- 

 versely barred with slate-color. Head plain ashy, 

 the throat paler, and the pileum darker. Young not 

 seen. Hab . Whole of Continental Tropical America. 



1. Micrastur semitorquatus (Vieillot). 

 Sparvius semitor quatus Vieill., Nouv. Diet, x, 1818, 322. — Id. Enc. 



Meth. in, 1263. 

 Micrastur semitorquatus Scl. and Salv., Ibis, 1839, 218. — Id. P. Z. 



S. 1869, 365. — Strickl., Orn. Syn. i, 1855, 122.— Lawr., Ann. 



N. Y. Lye. ix, 134. 

 Sparvius melanoleucus Vieill., N. D. x, 1817, 327. — Id. Enc. 



Meth., 1267. 

 Falco braclnjpterus Temm., PL Col. 116 (juv.) et 141 (ad.~). 

 Astur brachypterus Spix., Av. Bras, i, 9. — Vig., Zool. J., i, 338. — 



Steph., Zool. xin, pt. 2, 28. 

 Nisus brachypterus Less., Man. Orn. i, 98.— Id. Tr. Orn., 62. — Cuv., 



Reg. An., ed. 2, i, 334. — Schleg., Mus. Pays-Bas, Astures, p. 52- 

 Accipiter brachypterus Gray, List B., Brit. Mus., 69. 

 Micrastur brachypterus Gray, Gen. B., ed. 2, p. 6; fob, sp. 1, pi. 10, 



f. 1. — Id. Hand List, i, 31, No. 290. — Pelzeln, Orn. Bras, iv, 



398. 

 Herpetotheres brachypterus Kaup, Monog. Falc. in Contr. Orn. 



1850, 71. 



