BIKDS OF NOBTH AND MIDDLE AMERICA. 507 



yellow on chest (rarely with anterior half pale yel- 

 low); no yellow supraloral line; upper parts dull 

 olive or grayish olive. 

 n. Wing longer (averaging 68.4), bill and feet smaller 

 (exposed culmen averaging 10.6, tarsus 18.2, middle 

 toe 12.4). 



Dendroica vigorsii vigorsii, adult female (p. 599) 

 nn. Wing shorter (averaging 62.5), bill and feet larger 

 (exposed culmen averaging 12.2, tarsus 19.2, mid- 

 dle toe 13.2). 



Dendroica vigorsii achrnstera, adult female (p. 602) 

 il Wings with not more than one distinct band, this (if present) 

 across tips of middle coverts, and yellowish. 

 j. Back streaked with black; a whitish orbital ring (interrupted 

 anteriorly); tarsus 21 to 23. (Eastern United States; Baha- 

 mas in winter. ) Dendroica kirtlandii, adults (p. 608) 



jj. Back not streaked with black; no whitish orbital ring; tarsus 

 less than 21. 

 k. Upper parts plain gray, becoming olive-green on forehead 

 and crown; under parts, except throat and chest, grayish 

 white. {Dendroica pity ophila.) 



I. Gray of upper parts lighter; forehead and crown yellowish 



olive-green. ( Cuba. ) 



Dendroica pityophila pityophila, adults (p. 605) 



II. Gray of upper parts darker; forehead and crown "green- 



ish-yellow, showing light yellow at base of upper mandi- 

 ble." (Abaco and Great Bahama islands, Bahamas. ) 

 Dendroica pityophila bahamensis, adults (p. 606) 

 kk. Upper parts not gray; under parts not grayish white. 

 /. Middle wing-coverts tipped with yellow or pale yellowish 

 gray, forming a distinct band; pileum plain olive-green. 

 m. Sides and flanks streaked with black or dusky. 

 n. Back spotted with chestnut; sides of head with black 

 markings; under parts rich yellow, with broad 

 black streaks on sides. (Eastern United States; 

 West Indies in winter.) 



Dendroica discolor, adult male (p. 607) 

 nn. Back plain dull olive-green, or with only faint indi- 

 cations of chestnut; sides of head with indistinct 

 grayish or dusky markings; under parts dull or 

 pale yellow, with grayish streaks on sides. 



Dendroica discolor, adult female (p. 607) 

 mm. Sides and flanks not streaked. 

 n. Above plain bright olive-green, beneath rich yellow. 

 (Islands of Grand Cayman and Swan Island, Carib- 

 bean Sea. ) Dendroica vitellina, adults (p. 610) 



nn. Above dull olive-green (sometimes partly gray), 

 beneath pale yellow. 



Dendroica vitellina, immature (p. 611) 

 II. Middle wing-coverts not tipped with yellow or pale yel- 

 lowish gray ; ^ pileum not plain olive green. ( Dendroica 

 palmarum. ) 



' The middle wing-coverts have a more or less distinct terminal margin of grayish, 

 but there is no approximation to a distinct bar. 



