PLATE 17 



Juv. Mai-- 







i 



,*- 











The longer left wing-coverts of adolescent <<ecoiid plumage) nialr. adult ilialr. and a<lult female 

 cvcstt-d pigeons. 1 1. '.I. Tnda del., Apr. HUH;. :itlier. in 



three forms. Depth of pigment and extent of iridescence indicated as in pi. 1'i. The blue 

 color gives the angles formed l>y the proximal bonier of the hand-elements and the >iwt- 



the feather shaft (sec- text). 



- 



