504 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



//. Throat and rlies^t only partly l)lat'k. 



Dendroica virens, adult female (p. 562) 

 kk. Pileum and back plain black or streaked olive-green and 

 black; breast and abdomen pure white. 

 /. Pileum and back uniform black; throat and chest uniform 

 black. (Texas to (iuatemala.) 



Dendroica chrysoparia, adult male (p. 565) 

 //. Pileum and back streaked olive-green and Idack; throat 

 and chest (usually) only partly black. 



Dendroica chrysoparia, adult female 



and immature male (p. 56(5) 



jj. No black, dusky, or olive postocular streak, the sides of head 



entirely yellow; back and rump gray, the former streake(l 



or spotted with black; black of chest with convex posterior 



outline; pileum at least jtartly yellow. (Western United 



States and British Cohuubia, south to Guatemala in winter.) 



Dendroica occidentalis, adult male (p. 567) 



}ih. Throat without any black. 



/. Wing with two distinct bands (across tips of middle and greater 

 coverts, respectively) of white, yellowish, or pale gray — or else 

 with these coalesced into a single large patch. 

 j. Upper parts light grayish blue. (Eastern United States; south 

 in winter to northern South America. ) 



Dendroica rara, adult male (p. 570) 

 Jj- 1 l>pt?i" parts not light grayish blue. 



k-. A superciliary stripe of white, yellow, or buff. 



/. Throat white or pale olive-yellowish; sides of head without 

 yellow.^ 

 vt. Back and auricular region greenish or bluish; no yelhiw 

 supraloral spot. 



Dendroica rara, adult female and 

 immature male (p. 570) 

 mm. Back and auricular region brownish gray or grayish 

 l)rown; a small yellow supraloral spot. 



Dendroica nigrescens, immature female (p. 557) 

 //. Throat yellow, orange, or buff, or else sides of head mostly 

 yellow. 

 VI. Sides of head mostly yellow; throat not wholly yellow, 

 orange, or buff. 

 n. Back olive-green; feathers of pileum dusky basally. 



Dendroica virens, immature female (p. 562) 

 vv. Rack grayish; feathers of pileum yellow basally. 



Dendroica occidentalis, immature female (p. 5()S) 

 nnii. Sides. of head not mostly yellow; throat wholly yel- 

 low, orange, or l)uff. 

 'u. Back neither gray nor plain grayish brown. 

 <). Back olive-green. 



Dendroica townsendi, immature female (p. 560) 

 <><>. Back not olive-green. 

 p. Back black with a whitish or yellowish stripe along 

 each side; throat orange. 



Dendroica blackburniae, adult male (p. 574) 

 pp. Back not black; throat not orange. 



'Except, in I), iiigrescnii^, a small supraloral spot. 



