BIRDS OF MIDDLE AND NORTH AMERICA. 705 



ee. Smaller (adult male averaging, wing55.4, tail 49. 1 ; adult female, wing 52.9, 



tail 47.8); coloration more intense, with upper parts bright yellowish 



olive-green, the forehead and superciliary region often inclining to 



orange. (Pacific coast district, north to British Columbia; in winter 



south to Cape St. Lucas and Sonora, east during migration to eastern 



Oregon, Arizona, and Chihuahua. )..Wilsouia pusilla ohryseola (p. 714) 



cc. Forehead and superciliary region yellowish olive-green, the crown similar 



but less yellowish. (Immature male and female and some adult females. ) 



d. Duller olive-green above, duller yellow below. 



Wiljonia pusilla pnsilla, immature (see Addenda) 

 dd. Brighter olive-green above, brighter yellow below. 

 e. Larger (averaging wing 55.4, tail 48.3); upper parts less yellowish olive- 

 green, under parts less intense yellow. 



Wilsonia pusilla pileolata, immature (see Addenda) 

 ee. Smaller (averaging wing 52.9, tail 47.8); upper parts more yellowish 

 olive-green, under parts brighter yellow. 



Wilsonia pusilla ohryseola, immature (see Addenda) 



bb. Upper parts gray or grayish olive; under tail-coverts white; larger (wing more 



than 60). (Eastern North America, south in winter through Mexico and 



Central America to Peru. ) 



c. A conspicuous "necklace" of black spots or streaks across chest; feathers of 



pileum conspicuously centered with black. 



Wilsonia canadensis, adult male and some adult females (p. 716) 

 cc. Chest with indistinct olive spots or streaks; feathers of pileum without dis- 

 tinct black centers Wilsonia canadensis, most adult females and 



immature male and female (pp. 716, 717) 



WILSONIA MITRATA (Gmelin). 

 HOODED -WARBLER. 



Inner webs of outermost rectrices partly white; back olive-green, 

 under tail-coverts yellow, and wing exceeding 60 mm. 



Advit male.^ — Forehead and anterior portion of crown, together 

 with loral, orbital, postocular, auricular, suborbital, and malar regions, 

 rich lemon or gamboge yellow, the lores sometimes with a little of 

 dusky or black; rest of head, including throat, together with chest, 

 deep black, that of the chest with an abruptly defined convex posterior 

 outline; hindneck, back, scapulars, lesser wing-coverts, rump, and 

 upper tail-coverts plain yellowish olive-green, the first sometimes 

 slightly tinged with grayish; wings and tail dusky brownish gray with 

 yellowish olive-green edgings, the middle wing-coverts broadly tipped 

 with that color; inner webs of three outermost rectrices extensively 

 white terminally, that on the exterior rectrix occupying more than the 

 terminal half; under parts of body pure rich gamboge or lemon yel- 

 low, becoming olive-greenish on sides and flanks, the under tail-coverts 

 paler yellow; under wing-coverts and axillars pale yellow, or white 



' The coloration is quite the same the year round, except that in autumn and winter 

 specimens the bill (which is nearly black in spring and summer) is more brownish, 

 with the mandible paler than the maxilla, while the yellow of the plumage is often 

 more intense. 



3654^voL 2—01 45 



