FALCONIDJE. — CLIII. 257 



»'. "Wing rather pointed, more than 4 times length of tarsus. 



Buteo, 421. 



ii. "Wing rounded, less than 4 times length of tarsus. 



Astujuna, 422. 

 ee. Tarsus about as long as tibia. 



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

 tail; tarsus scutellate in front only, rarely booted. 



Accipiter, 420. 



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



very long, longer than the long tail , tarsus scutellate 



in front and behind Circus, 419. 



bb. 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. 



(FalcunincB.) Falco, 426. 



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

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



F.y.ndion, 427. 



416. ELANOIDES Gray. (Elanus; eZ&os, form.) 



803. E. forficatus (L.). Swallow-tailed Kite. Lustrous vvn^V 

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

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



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



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



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

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

 W. 13. T. 7. Tropical Am., X. to S. 111. (XevKos, white ; ovpd, tail.) 



418. ICTINIA Vieillot. (Iktivos, kite.) 



805. I. mississippiensis (Wilson). Mi»sissippi Kite. Chiefly 

 lead Hue, wings with chestnut. L. 15. W. 12. T. Gi. S. E. U. S., 

 X. to Penn. and Wis. 



419. CIRCUS Lacepede. (kI P kos, 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 brown. 

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

 white runip. 



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



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

 separated behind. (Aceipiter.) 



807. A. velox (Wilson). Shaep-Shixxed Hawk. "Pigeox 

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

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



17 



