FALCO AUDUBONI. 179 
wing-coverts are brownish black, faintly tinged with 
blue. Quill-feathers of the wings brownish black, 
the imner webs being marked with numerous oval 
white spots. The first and second primary quills 
have their inner webs deeply and abruptly emar- 
ginated near their extremities ; the second and third, 
which are the longest, are nearly of equal length. 
Tips of the primaries (the first three excepted) and 
of the secondaries finely bordered with dull white. 
The tail is brownish black, tipped with white, and 
has several narrow transverse bands of a cinereous 
hue. The chin and throat are white, streaked longi- 
tudinally with fine lines of dark brown. Breast, 
sides, abdomen, and under tail-coverts yellowish 
white, with longitudinal streaks and spots of a dark 
brown colour; the largest and roundest spots occur 
on the sides. Under wing-coverts dark brown, 
spotted with white. The feathers of the thighs are 
pale ferruginous, streaked longitudinally with dark 
brown. The tarsi and toes are yellow, the former 
being reticulated and the latter scutellated above. 
Claws black. Colour of the eyes not known. 
Length, from the point of the bill to the extremity 
of the tail, 92 inches; wings, from the carpal joint to 
the tip of the second quill-feather, 73; tail 5; bill, 
from the point of the upper mandible to the rictus, 7 ; 
tarsi 14%; ; middle toe, including the claw, 12. 
The Museum belonging to the Society for the 
promotion of Natural History, established in Man- 
N 2 
