86 NORTH AMERICAN BIRDS. 



P. Distance from posterior end of 

 nostril to loral feathers 

 equal to or greater than 

 length of nostril; anterior 

 outline of loral feathering 

 strongly convex. 

 Histrionicus. (Page 107.) 

 l\ Distance from posterior end of 

 nostril to loral feathers less 

 than half the length of the 

 nostril; anterior outline of 

 loral feathering forming a 

 nearly straight line, run- 

 ning obliquely backward 

 and downward from near 

 nostril to corner of mouth. 

 Clangula. (Page 106.) 

 p. Distance from tip of bill to loral feather- 

 ing greater than graduation of tail. 

 A 1 . Distance from posterior border of 

 nostril to angle of mouth much 

 less than half the distance from 

 anterior border of nostril to tip 

 of upper mandible. 

 P. Width of bill at base equal to 

 one-half the length of cul- 

 men ; speculum plain white. 

 Camptolaimus. (Page 

 107.) 

 P. Width of bill at base much less 

 than one-half the length of 

 the culmen ; speculum dark- 

 colored (steel-blue or violet 

 in male), bordered before 

 and behind by a white bar. 

 Enic«netta. (Page 107.) 

 k 2 . Distance from posterior border of 

 nostril to angle of mouth equal 

 to or greater than distance from 

 anterior end of nostril to tit) of 

 upper mandible. 



Oidemia. (Page 110.) 

 h 2 . Feathering of forehead or lores reaching anteri- 

 orly to or beyond posterior end of nostril. 

 i 1 . Feathering of forehead continuous with that 



