BIRDS OP NORTH AND MIDDLE AMERICA. 



633 



Immature. — Similar to adults, but subterminal areas of longer 

 primaries deep brownish gray or dusky instead of black, and more 

 extended, the white tip of some of the primaries wanting; tail some- 

 times (in younger individuals) more or less blotched with dusky on 

 terminal portion, and upper tail-coverts sometimes (in still younger 

 birds) faintly barred with grayish brown. 



Young. — Head, neck, and under parts nearly uniform light brown- 

 ish gray or grayish brown; upper parts grayish brown, the feathers 

 margined with pale grayish buff, the rump and upper tail-coverts 

 pale grayish buff or dull buffy whitish, irregularly, and more or less 

 distinctly, spotted with grayish brown; basal half (approximately) 

 of tail dull grayish white or very pale grayish, transversely mottled 

 with darker, the distal portion deep grayish brown, forming a well- 

 defined broad band, the extreme tip whitish. 



Young in first winter. — Similar to the first plumage, but light 

 colored margins to feathers of upper parts decidedly white; basal half 

 of tail uniform grayish white; under parts mostly white, the chest 

 and sides spotted or clouded with light grayish brown; upper parts 

 more or less tinged with pure light gray. 



Downij young. — General color pale brownish gray or buffy grayish, 

 paler and usually more buffy on head, neck, and under parts; head 

 with numerous irregular rather large spots of black, of- which the 

 most conspicuous occupy the anterior portion of forehead (as in L. 

 canus) and posterior portion of malar region, respectively; back, 

 etc., with large, irregular spots or cloudings of sooty grayish or 

 dusky; bill dusky brownish, broadly tipped with lighter and more 

 yellowish brown. 



Adult male.—Wmg, 352-366 (358.9); tail, 137-148 (142.8); ex- 

 posed culmen, 33-38 (36.4); tarsus, 46.5-51 (49.4); middle toe, 37.5- 

 41 (39.5).« 



Adult femdle.~Wmg, 328-354 (344.6); tail, 131.5-139 (134.9); ex- 

 posed culmen, 32-37 (34.1); tarsus, 45-48 (46.7); middle toe, 36-38.5 

 (37.5).^ 



a Seven specimens. 



^ Eleven specimens. 



