RED-SHOULDERED HAWK. 299 



Falco lineatus, Gmel. Syst. Nat. vol. i. p. 268.— Lath. Synops. vol. i. p. 27.— Wils. 



Amer. Ornith. voL vi. p. 86. PL 53, fig. 3. Young Male. 

 Falco hyemalis, Ch. Bonaparte, Synops. of Birds of the United States, p. 33. 



Adult Male. Plate LVI. Fig. 1. 



BiU short, as broad as deep, the sides convex, the dorsal outline con- 

 vex from the base ; upper mandible cerate, the edges blunt, slightly in- 

 flected, with an obtuse lobe towards the curvature, the tip trigonal, de^ 

 fleeted, verj acute ; lower mandible involute at the edges, a Uttle trun- 

 cate at the end. Nostrils round, lateral, with a soft papiUa in the centre. 

 Head rather large. Neck and body rather slender. Legs longish ; tar- 

 sus rather slender, anteriorly scutellate ; toes scutellate above, scaly on 

 the sides, scabrous and tuberculate beneath ; middle and outer toe con- 

 nected at the base by a small membrane ; claws roundish, slender, cur- 

 ved, very acute. 



Plumage compact, imbricated ; feathers of the head and neck narrow 

 towards the tip, of the back broad and rounded ; tibial feathers elongated 

 behind. Wings long, third and fourth primaries longest, first short. 



Bill light blue at the base, bluish-black at the tip; cere, basal margin 

 of the biU, edges of the eyeUds, and the feet, bright yellow. Iris hazel. 

 Claws black. Head, neck, and back, light yellowish-red, longitudinally 

 spotted with dark brown. Tail brownish-black, banded with greyish- 

 white, the tip of the latter colour. Lesser wing-coverts bright yellowish- 

 red, spotted with brown ; larger coverts and secondary quills dusky, broad- 

 ly barred with white ; primary quills brownish-black banded with white, 

 the greater part of their inner webs being of the latter colour. Lower parts 

 of the neck and under wing-coverts light yellowish-red, the former longitu- 

 dinally hned with blackish; breast reddish- white, marked with transverse 

 hastate yellowish-red spots ; abdomen and under tail-coverts reddish- 

 white. Tibial feathers yellowish, transversely barred with dull orange. 



Length 18 inches; biU along the back 1^, along the gap from the 

 tip of under mandible 11 ; tarsus 2|. 



Adult Female. Plate LVI. Fig. 1. 



The female differs from the male in being a little larger, and in hav- 

 ing the tints lighter. 



