248 NORTH AMERICAN BIRDS. 



Aleutian Islands, west to Commander Islands, and south along 

 Pacific coast to Oregon. 



356a. F. peregrinus pealei Eidgw. Peale's Falcon. 

 c a . Second quill longest, but first longer than third ; second with inner 

 web not appreciably sinuated near tip ; adult and young not very 

 different in plumage, the latter not distinctly striped beneath ; size 

 small (wing not exceeding 12.00 — usually much less). (Subgenus 

 Neofalco Eidgw. 1 ) 

 d 1 . Wing 9.50, or more ; under tail-coverts ochraceous, or white and 

 rufous, with large transverse spots of black ; upper tail-coverts 

 barred with white or pale ashy. Adult: Above plumbeous 

 black, distinctly bordered with bluish plumbeous ; throat and 

 chest immaculate white centrally and anteriorly, rufous later- 

 ally and posteriorly ; thighs plain rufous. Young : Above uni- 

 form dull black, the feathers sometimes slightly margined with 

 rusty ; throat and chest varying from white to ochraceous or 

 rufous, this always deepest laterally and posteriorly ; thighs 

 sometimes thickly spotted transversely with blackish. Male : 

 Length about 12.50, wing 9.50-9.90, tail 5.40-5.50, culmen .72, 

 tarsus 1.40-1.55, middle toe 1.75. Female: Length about 15.00, 

 wing 10.90-12.00, tail 6.00-6.25, culmen .90, tarsus 1.50-1.60, 

 middle toe 1.85-2.10. Hah. Tropical America in general (ex- 

 cept West Indies), north to southern Mexico. 



F. deiroleucus Tkmm. Temminck's Falcon. 2 

 d 2 . Wing not more than 9.00 ; under tail-coverts deep rufous, usually 

 immaculate, but sometimes slightly barred with white and 

 dusky ; upper tail-coverts indistinctly barred with plumbeous. 

 Adult: Above plumbeous-black, the feathers with bluish 

 plumbeous tips and edges, and, on rump, etc., more or less 

 distinctly barred with same; throat and chest buffy whitish, 

 becoming deeper buffy or ochraceous posteriorly. Young : 

 Similar to adult, but upper parts without plumbeous bars, or 

 tips, and sometimes having a slight brownish cast, the feathers 

 usually with indistinct rusty margins ; throat and chest deep 

 ochraceous, the latter usually with a few dusky streaks. Male : 

 Length about 9.50-10.00, wing 7.20-8.80, tail 5.00-5.50, culmen 

 .58, tarsus 1.25-1.50, middle toe 1.15-1.30. Female: Length 

 about 11.00, wing 8.50-9.00, tail 5.00-5.50, culmen .58, tarsus 

 1.48-1.55, middle toe 1.30-1.40. JIab. Tropical America in 

 general (except West Indies), north to northern Mexico (Nuevo 

 Leon and Mazatlan). 



F. albigularis Dauii. White-throated Falcon. 8 



1 New subgenus ; type, Falco albigularis Datjd. 



2 Falco deiroleucus Temm., PI. Col. i. 1825, pi. 348. 



3 Falco albigularis Daud., TraiU, ii. 1800, 131. 



