1873.] 77 [Ridgway. 



Falco leucomelus (Hlig.) Licht., Yerz. Doubl., p. 62; 1823. 

 Carnifex naso Less., L'Eclio du Monde savant, annee 9, p. 1081. — 

 Id. Rev. Zool. 1842, 379. 



Sp. ch. Wing, 9.70-11.20; tail, 9.80-13.00; culmen, .80-1.00; 

 tarsus, 3.10-3.40; middle toe, 1.60-2.05. 3d-6th quill longest; 1st 

 much the shortest. Above plumbeous, black to blackish brown, in- 

 terrupted by a more or less conspicuous nuchal collar of white or 

 ochraceous. Tail with 4-7 narrow light bands, usually interrupted, 

 the last terminal, the first concealed. Adult. Lower parts entirely 

 immaculate, varying from pure white to deep ochraceous. Upper 

 parts un variegated ; nuchal collar distinct. Young. Lower parts 

 more or less barred or spotted with blackish ; upper parts usually 

 more or less obscurely barred, or spotted transversely, with ochra- 

 ceous, or dull rusty. 1 



Specimens examined. Nat. Mus., 15; Philad. Acad., 7; Boston 

 Soc, 2; Cab. G. N. Lawrence, 3. Total, 27. 



Hab. Whole of Continental Tropical America from Mazatlan and 

 Vera Cruz to Southern Brazil. 



2. Micrastur mirandollei (Schlegel). 

 Astur mirandollei Schleg., Ned. Tijdschr, I, 130; — Id. Mus. Pays- 



Bas, Astures, p. 27. 

 Micrastur mirandollei Scl. & Salv., P. Z. S. 1867, 759.— Id. P. Z. 



S. 1869, 365. — Gray, Hand List, i, 31, no. 291. — Pelz., 



Orn. Bras, iv, 398. 

 Micrastur macrorliynclius (Natt.) Pelz., Orn. Novara, 1865, p. 11. — 



Id. Orn. Bras., p. 7. 

 Sp. ch. Wing, 9.00-9.30; tail, 7.80-9.00; culmen, .80-.85; tar- 

 sus, 2.80-3.15; middle toe, 1.30-1.45. 5th quill longest; 1st shortest. 

 Adult. Above uniform plumbeous, without a lighter nuchal collar; 

 tail more blackish, narrowly tipped with white, and crossed by three 

 narrow bands of white, transversely mottled with dusky, or pale 

 grayish brown, the first concealed by the coverts. Lower parts, in- 

 cluding the under side of the wing, and sometimes the maxilla?, con- 

 tinuous white, the shafts of some of the feathers usually black; breast 

 sometimes with faint crescentic transverse spots of pale grayish. 



Specimens examined. Philad. Acad., 2 ; Cab. G. N. Lawrence, 2; 

 Boston Society, 1. Total, 5. 



1 All specimens seen from Tehuan tepee and Mazatlan are pure white beneath, 

 and those from Gautemala, Costa Rica and Panama deep ochraceous. 



