370 BLACK-SHOULDERED HAWK. 
the head gradually blends into the general colour of the upper parts, 
which is ash-grey ; the smaller wing-coverts bluish-black ; the shafts 
of the quills brownish-black ; all the feathers of the tail, excepting 
the two middle, white ; the shafts of the two middle feathers blackish- 
brown, of the rest white towards the end, the whole of that of the 
outer pure white. 
Length to end of tail 16 inches, to end of claws 12}, to end of 
wings 144; extent of wings 40 ; wing from flexure 13; tail 773; bill along 
the ridge 14, along the edge of lower mandible 1;%; tarsus 1y’z5 first 
toe 74, its claw 2; second toe 3%, its claw +$; third toe 4, its claw 7; 
fourth toe 1%, its claw 7%. Weight 14 oz. 
Adult Female. Plate CCCLII. Fig. 2. 
The female is rather larger than the male, but in other respects 
similar. 
Length to end of tail 163 inches, to end of wings 153, to end of claws 
123 ; extent of wings 413 ; tail 8 ; wing from flexure 133 ; bill along the 
ridge 13, along the edge of lower mandible 13; tarsus 1; hind toe 
2, its claw $; outer toe 4, its claw 4; middle toe 1, its claw 3; imner 
toe 4, its claw 3. Weight 17} oz. 
The young when fledged have the bill and claws black, the cere and 
feet dull yellow ; the upper parts brownish-grey, the scapulars and 
quills tipped with white, the former also margined with yellowish- 
brown ; the primary and secondary coverts are also tipped with white ; 
the smaller wing-coverts are brownish-black ; the outer webs of all 
the tail-feathers are more or less brownish-grey toward the end. The 
lower parts are white, the feathers on the breast tinged with brownish- 
yellow at the end, and with the shaft yellowish-brown. The lower 
wing-coverts are all white. 
