BIRDS OF NORTH AND MIDDLE AMERICA 67 



jj. Toes relatively longer; the middle toe without claw much 

 more than half the length of the tarsus. 

 k. Depth of bill at base not less than chord of culmen; 

 middle toe without claw equal to or longer than 

 naked portion of tarsus in front; lores densely- 

 feathered Accipiter (p. 141) 



kk. Depth of bill at base decidedly less than chord of 

 culmen; middle toe much shorter than naked portion 

 of tarsus in front; lores nearly naked-. Parabuteo (p. 368) 

 //. Tail less than two-thirds the length of the wing. 



(7. Acrotarsium covered for the greater part with small, rough, 

 hexagonal scales; about 6-8 large, broad transverse scutellae 



on the middle portion Urubitornis (p. 415) 



gg. Acrotarsial scutellae all (where present) of the large transverse 

 type. 

 h. Lores, entirely or nearly naked, devoid of (or with only few) 



bristles Buteogallus (p. 396) 



hh. Lores more or less covered with bristly feathers. 



i. Tarsus very short, less than twice the length of the bill. 



Ictinia (p. 118) 

 n. Tarsus more than twice the length of the bill. 



j. Middle toe without claw less than half length of tarsus. 



Heterospizias (p. 204) 

 jj. Middle toe without claw more than half the length of 

 tarsus. 

 k. The five outermost primaries definitely emarginated 



on their inner webs Busarellus (p. 409) 



kk. The three or four outermost primaries emarginated on 

 their inner webs; sometimes fifth one sinuated or 

 faintly emarginated. 

 I. Fifth primary sinuated on its inner web. 



m. Longest primary exceeding distal secondary by 

 nearly one-third to more than one-third length 

 of wing. 

 Buteo, part (subgenus Geranoaetus, extralimited 

 mm. Longest primary exceeding distal secondary by 

 much less than one-third length of wing. 

 n. Maxillary tomium bluntly toothed. 



Hypomorphnus (p. 388) 

 nn. Maxillary tomium not bluntly toothed but 

 slightly, if at all, sinuated. 



Leucopternis (p. 376) 

 II. Fifth primary not sinuated at all Buteo (p. 21 1) 



Subfamily Elaninae: White-tailed Kites 



<Elani RiDGWAY, Proc. Boston Soc. Nat. Hist., xvi, 1873, 53 (excludes CheHciinia). 

 -Elani RiDGWAY, U. S. Geol. and Geogr. Surv. Terr., ser. 2, Bull. No. 2 1876 150 

 > Elaninae Shufeldt, Ibis, 1891, 232 (Elanus only).— Petees, Check-list Birds 



of World, i, 1931, 192 (excludes Gampsonyx). 

 -Elaninae Pycraft, Proc. Zool. Soc. London, 1902, 315.~Wetmore and Miller, 



Auk, xliii, 1926, 342.— Wetmore, Smiths. Misc. Coll., Ixxxiv, No. 13, 1934, 33. 

 839094—50 6 



