FALCONID^. — CLIII. 257 



i. Wing rather pointed, more than 4 times length of tarsus. 



huTno, lai. 



it. Wing rounded, less than i times length of tarsus. ^ 



ASTUULNA, -122. 

 ee. Tarsus about as long as tibia. 



j. Face without ruff; wings rounded, little longer than 

 tail; tarsus scutellate in front only, rarely booted. 



ACCIPITEB, 420. 



jj. Face with a slight ruff, somewhat as in owls ; wings 



very long, longer than the long tail ; tarsus scutellate 



in front and behind Circus, 419. 



lib. Nostrils small, circular, with a conspicuous central bony tubercle ; cut- 

 ting edge of upper mandible with a strong tooth, separated from 

 hooked tip of bill by a distinct notch; tarsus reticulate all around. 



(Falconirue.) Falco, 426. 



ail. Outer toe reversible; claws all of the same length, narrowed and rounded 

 on lower side; tarsus reticulate ; plumage compact. (PanrKonince.) 



' fASDION, 427. 



416. ELANOIDES Gray. (Elanus; «8os, form.) 



803. B. forficatus (L.). Swallow-tailed Kite. Lustrous 

 black ; head, neck, lower parts, and band on rump white ; young 

 streaky. L. 25. W. 1 7. T. 14. Southern, N. to Penn. and Minn. 

 (Lat., for/ex, shears ; tail deeply forked, like shears.) 



417. ELANUS Savigny. (Lat., kite.) 



804. E. leucurus (Vieillot). White-tailed Kite. Bluish 

 gray, with white on head and tail, and black on shoulder. L. 17. 

 W. 13. T. 7. Tropical Am., N. to S. 111. (\evK6s, white ; ovpd, tail.) 



418. ICTINIA Vieillot. (i/cTii/or, kite.) 



805. I. mississippiensis (Wilson). Mississippi Kite. Chiefly 

 lead blue, wings with chestnut. L. 15. W.12. T. 6^. S. E. U. S., 

 N. to Penn. and Wis. 



419. CIRCUS Lac^pfede. (jilpKos, a kind of hawk.) 



806. C. hudsonius (L.). Marsh Harrier. Chiefly pale 

 bluish gray ; rump and under parts whitish ; tail bluish, mottled 

 and tipped with white, and with dark bands ; 9 dusky browiL 

 L. 18. W. 15. T. 9. N. Am., abundant; readily known by the 

 white rump. 



420. ACCIPITBR Brisson. (Lat., hawk.) 



o. Tarsus feathered less than 5 of the way down in front, the feathers well 

 separated behind. (Accipiter.) 



807. A. velox (Wilson). Sharp-Shinned Hawk. "Pigeon 

 Hawk." Tail truncate; tarsus sometimes "booted"; general 

 color bluish gray, breast, sides, etc., whitish, streaked with reddish 



17 



