BIRDS. 41 



kk. Nostrils concealed by bristly feathers; tarsus scutellate 

 behind; hind claw long and nearly straight; inner 

 secondaries lengthened. , . . Alaudid^, 25. 



kkk. No crest; nostrils exposed; tarsus strictly "oscine." 



I. Hind claw much elongated, twice as long as middle claw, 

 with its toe much longer than middle toe and claw; 

 bill very slender; longest secondary nearly equal to 

 primaries in closed wing. . Motacillid^, 26. 



U. Hind claw not specially elongated, not twice as long as 

 middle claw ; inner secondaries not lengthened. 



m. Bill stout, compressed, notched, and abruptly hooked 

 at tip; general color olivaceous, tail not blotched 

 with white or yellow. . . Vireonid.e, 31. 



V mm. Bill various, notched or not, but little, if at all, 

 hooked; colors often brilliant. Sylvicolid^, 27. 



II. Glamatores. Outside of tarsus covered with a series of plates 



variously arranged, lai)ping entirely around in front and 



behind to meet in a groove on the inner side ; primaries 10. 



n. First primary lengthened, often longest, always more than f 



length of the longest; bill broad, depressed, tapering to a 



point which is abruptly hooked ; rictal bristles numerous; 



nostrils overhung but not concealed ; tail not tipped with 



yellow. .... Tyrannid^, 36. 



H. FAMILIES OF PICARI^. 



I. Feet zygodactyle (two toes in front, two behind) by reversion 



of outer toe; (hallux wanting in Picoides.) 



a. Tail scansorial, of 12 rigid, acuminate feathers, of which the 

 outer pair are short and concealed; bill stout and straight; 

 nasal tufts usually developed. . . . Ptcid^, 42. 



aa. Tail not scansorial, of 8 to 10 long, soft feathers; bill de- 

 curved ; no nasal tufts CUCUT.ID^., 41. 



II. Feet syndactyle, by cohesion of outer and middle toes; tibiae 



naked below ; bill stout and straight, longer than head. 



Alcediniu^, 40. 



III. Feet neither zygodactyle nor syndactyle; wings long and 

 pointed. 



