502 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Mexico and Central America, from Lower California and Sinaloa 



to Costa Rica. ) . .Dendroica bryanti castaneiceps, adult male (p. 530) 



cc Under parts duller yellow, usually without streaks, very rarely distinctly 



streaked. (Adult females and young.') 



/'/(. Sides of head, alone, or together with chin, throat, and chest, orange-tawny, 



the pileum olive-greenish or dusky grayish; chest and sides without streaks. 



(Jamaica. ) Dendroica eoa, adults (p. 5ol ) 



an. Inner webs of rectrices without any yello\\'. 



h. \ nner webs of lateral rectrices with a distinct patch or spot of white. 

 r. White on inner webs of rectrices on middle portion, present and of nearly 

 equal extent on all but middle pair. (Eastern United States and British 

 Provinces. ) 



Dendroica maculosa (p. 532) 



cc. White on inner webs of rectrices on terminal or sul)tcrniinal portion (or else 



occupying greater part of the web), present on not more than three or 



four (very rarely five) rectrices and greatly decreasing in extent from the 



outermost. 



d. Bill with tip acute, decurved; sides of neck yellow, or else rump yellowish 



olive or olive-yellowish, much brighter than the plain grayish olive l)ack. 



(Eastern North America; West Indies in winter. ) 



Dendroica tigrina (p. 537) 

 dd. Bill with its tip not acute nor decurved; sides of neck not yellow; rump 

 not yellowish olive or olive-yellowish, different from (rolor of l)ack, or 

 else the latter streaked with darker. 

 e. Wing without light colored bands or edgings, but (usually) with a white 

 spot at base of primaries. {Dendroica civrnlescens. ) 

 f. Upper parts dark grayish blue; sides of head, throat, and sides black; 

 rest of under parts white. 

 g. Back dark grayish blue, like rest of upper i)arts (rarely with slight 

 a<lmixture of black). (Eastern North America, breeding from 

 mountains of Pennsylvania northward. ) 



Dendroica caerulescens caerulescens, adult male (p. 541) 

 gg. Back mostly black or spotted or clouded with black. (^Mountains 

 of North Carolina to .southern Pennsylvania.) 



Dendroica caerulescens cairnsi, adult male {]>. 545) 

 //'. Above plain olive; under parts pale buffy or yellowish, shaded with 

 olive laterally. 

 g. Lighter and l)righter olive al)ove, more yellowish beneath. 



Dendroica caerulescens caerulescens. adult female (p. 541) 

 g. Darker and duller olive above, less yellowish beneath. 



Dendroica caerulescens cairnsi, adult female (p. 545) 

 et>. Wing with more or less distinct light-colored bands or edgings, or both, 

 but without a white spot at base of primaries. 

 /. White on inner web of lateral rectrices an extensive and well-defined 

 terminal or subterminal area, extending to shaft, this white spot dis- 

 tinct on at least two lateral rectrices; plumage more or less streaked, 

 either above or below, or else^ tail emarginate. 

 g. A yellow spot on rump and one on each side of breast. 



/(. Throat white (sometimes tinged with brownish) ; twoto three lateral 

 rectrices with a subterminal white spot on inner web. (North 



'Owing to the very great range of individual variation in adult females and imma- 

 ture birds I find myself unable to devise a key to the different species and subspecies. 

 ■^ In J>. vigorsii and its subspecies. 



