264 BULLETIN 2 08, UNITED STATES NATIONAL MUSEUM 



ments in millimeters: male: wings 75-84; tail 48-56; culmen from base 

 10-13; tarsus 11-13; female: wings 75-83.5; tail 48-53.5; culmen from 

 base 11.5-13; tarsus 11-12, 



Juvenal (sexes alike): Similar to the adult, but generally paler 

 above; chin and throat averaging slightly duskier, abdomen less 

 pure whitish; three lateral pairs of rectrices white without any brown 

 tips, sometimes with a partial narrow edging of brown on the inner 

 two of these thi'ee pairs; iris dark brown; bill blackish or sepia, orange 

 at the gape; feet gray to blackish. 



Natal down: Not laiown, if any. 



