ACCIPITRIN&E. 21 
of the abdomen ; vent, under tail-coverts, and thigh-coverts pale 
unspotted rusty. 
The adult male has the whole upper plumage unspotted ashy, 
pale ashy beneath ; chin and throat whitish; wings dusky-black ; 
thigh-coverts, and under tail-coverts, bright rusty-red. 
Dr. Jerdon remarks that the Red-legged Falcon is not common 
in India, but that he has killed it in Central India; it is nearly 
certain that he mistook it for 19 bis, Cerchneis amurensis, Radde. 
This latter Major Butler procured at Belgaum. The points of 
difference are as follows:— 
VESPERTIN A. 
AMURENSIS. 
ADULT ¢. 
Under wing-coverts and amillaries. 
Bluish-grey. 
Pure white. 
Breast. 
Bluish-grey. 
Grey. 
ADULT 9. 
Under surface. 
Rufous, either uniform or with 
slight remains of blackish shaft 
lines, 
Creamy-white; the breast 
broadly streaked and the flanks 
barred with black; abdomen, 
thighs, and under tail-coverts 
uniform pale rufous. 
JUV. 
Head. 
Rufous with narrow shaft lines 
of black; forehead whitish; under 
surface of body buff, streaked 
down the centres of the feathers 
with brown ; no bars on the 
flanks ; tail bluish. 
Dark bluish, with black shaft 
streaks; forehead fulvous ; un- 
der surface of body buff, 
broadly streaked with black on 
the chest and barred on the 
flanks with the same color; tail 
bluish. 
Sup-ramity, Accipitrine. 
Bill short and stout, curving from the base, with a blunt tooth 
or festoon in the upper mandible; wings short, rounded; tail 
longish, ample, and rounded; tarsus long, scutellate in front, or 
nearly smooth in some; toes long; claws long, curved and acute, 
unequal ; inner-claw large. 
Genus, Astur, Lac. 
Bill short, stout, curved from the base, compressed, with a 
prominent festoon or rounded tooth inthe upper mandible, near 
the middle; nostril large, oval, oblique, near the culmen; lores 
thickly clad with minute feathers; wings short, rounded ; first 
quill short, fourth and fifth quills usually equal and longest; 
tail long, far exceeding the points of the wings, nearly even or 
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