500 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



i. Smaller (wing averaging 63.3, tail 47.8). (Southwestern border 

 of United States, from western Texas to Arizona, and south- 

 ward into northwestern Mexico.) 



Dendroica sestiva sonorana, adult male (p. 512) 

 a. Larger (wing averaging 68, tail 53). (Central Mexico.) 



Dendroica sestiva dugesi, adult male (p. 513) 

 gg. Smaller (wing averaging less than 62, tail averaging less than 40) 

 and duller colored; pileum always olive-green, like back, rarely 

 becoming yellowish on forehead; wing-coverts and tertials nar- 

 rowly edged with yellowish olive-gveen or olive-yellow; back, etc., 

 darker olive-green. ("Vancouver Island to Alaska in summer, south 

 to southern California, central Texas, and Nicaragua in winter. ) 

 Bendroica sestiva rubiginosa, adult male (p. 514) 

 ee. Wing more rounded, the outermost (ninth) primary decidedly shorter 

 than sixth; tarsus longer, very rarely less than 20, averaging 20.9; 

 tail relatively longer, averaging about 48.5; West Indian.' 

 /. Larger ( wing of adult male usually more than 60, averaging more than 

 61); pileum without a distinct patch of tawny, chestnut-tawny, or 

 chestnut, or else wing 62 or more, averaging 65.4. [Dmdroica 

 petechia. ) 

 g. Pileum without a distinct patch of orange-ochraceous or tawny, or 

 if pronouncedly thus colored the color not sharply defined nor 

 strongly contrasted laterally against the yellow of the superciliary 

 region; wing averaging not more than 65, usually much less. 

 h. Lighter, brighter, more yellowish olive-green above; the pileum 

 usually more or less tinged with yellow, ochraceous, or tawny, 

 sometimes mostly thus colored; yellowish wing-markings more 

 distinct, more decidedly yellow; yellow of under parts deeper. 

 i. Yellow of under parts less intense and chestnut streaks on chest 

 and sides narrower or fewer. 

 j. Wing longer (averaging 65) and bill smaller (exposed culmen 

 averaging 10.6). (Island of Jamaica; Haiti?). 



Dendroica petechia petechia, adult male (p. 515) 

 jj. Wing shorter (averaging 61.4) and bill larger (exposed culmen 

 averaging ll.I). (Island of Grand Cayman.) 



Dendroica petechia auricapilla, adult male (p. 517) 

 a. Yellow of under parts more intense, and chestnut streaks on 

 chest and sides heavier or more numerous. 

 j. Smaller (wing averaging 61, tail 47.9, exposed culmen 11, tarsus 

 20.5) ; chestnut streaks on chest and sides averaging narrower; 

 crf)wn more rarely tinged with ochraceous or tawny. (Baha- 

 mas.) Dendroica petechia flaviceps, adult male (p. 517) 



jj. Larger (wing averaging 62.3, tail 49.1, exposed culmen 11.3, 

 tarsus 21.3); chestnut streaks on chest and sides averaging 

 heavier; crown more often tinged with ochraceous or tawny. 

 (Islands of Porto Rico, Vieques, St. Thomas, Virgin Gorda, 

 Anegada, St. Croix, Anguilla, St. Bartholomew, St. Eustatius, 

 St. Christopher?, Barbuda, and Antigua. ) 



Dendroica petechia bartholemica, adult male (p. 518) 



hh. Darker and duller olive-green above, the pileum usually concolor 



with back, or nearly so (rarely distinctly tinged with yellow, 



" Except one form on Cozumel Island, Yucatan, and one from the Galapagos Archi- 

 pelago, Cocos Island, and contiguous coast of South America. 



