FALCONHLE. CLIII. 257 



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



BuTJto, 421. 

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



ASTUKINA, 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, somewhat 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. 



(Falconince.) FALCO, 426. 



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

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



? A* DION, 427. 



416. ELANOIDES Gray. (Elanus; 8o?, form.) 



803. E. 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., forfex, shears ; tail deeply forked, like shears.) 



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



804. E. leucurua (Vieillot). WHITE-TAILED KITE. Bluish 

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

 W. 1 3. T. 7. Tropical Am., N. to S. 111. (\CVKOS, white ; ovpa, tail.) 



418. ICTINIA Vieillot. (IKTIJ/OS, kite.) 



805. I. mississippiensia (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 Lacepede. (*'p*os, 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. N. Am., abundant; readily known by the 

 white rump. 



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



a. Tarsus feathered less than $ 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 



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