PASSERINE BIRDS OF NEW YORK 237 



moult beginning the end of July which involves the body plum- 

 age and wing^coverts but not the rest of the wings nor the tail, 

 young and old becoming practically indistinguishable. 



Similiar to the previous plumage but greener with a grayer crown, and brighter yellow 

 below. Above, dull olive-green, slate-gray on the pileum. Below pale canary- 

 yellow, whiter on middle of abdomen. Sides of head pale greenish or grayish 

 buff, superciliary stripe paler ; transocular streak dusky. 



4. FIRST NUPTIAL PLUMAGE acquired by wear. The back 

 fades a little and becomes grayer, the yellow below, paler. 



5. ADULT WINTER PLUMAGE acquired by a complete post- 

 nuptial moult. Practically indistinguishable from first winter 

 dress, the yellow below usually paler with a larger area of white 

 on the abdomen. 



6. ADULT NUPTIAL PLUMAGE acquired by wear as in the 

 young bird. 



Female. The sexes are alike and the moults are the same. 



Vireo gilvus (Vieill.). WARBLING VIREO 



1. NATAL DOWN. Pale wood-brown. 



2. JUVENAL PLUMAGE acquired by a complete postnatal moult. 



Similar to V. philadelphicus but paler. Above wood-brown, very pale on pileum 

 and nape, darker and faintly tinged with olive on the back. Wings and tail 

 pale clove-brown edged with dull olive-green. Below, white, the crissum 

 tinged with pale primrose-yellow. Auriculars, orbital ring and superciliary 

 line white. Bill and feet pinkish buff, becoming dusky and slate-gray re- 

 spectively when older. Iris deep hazel -brown. 



3. FIRST WINTER PLUMAGE acquired by a partial postjuvenal 

 moult beginning early in August which involves the body plum- 

 age and the wing coverts but not the rest of the wings nor the 

 tail, young and old becoming practically indistinguishable. 



Similar to the previous plumage but greener above. Above, grayish olive-brown, 

 the pileum mouse-gray. Below, buffy white, palest on chin and abdomen, 

 washed on the sides and flanks with greenish primrose-yellow. Superciliary 

 line, suborbital region and orbital ring very pale buff. A dusky transocular 

 streak. Auriculars drab. 



4. FIRST NUPTIAL PLUMAGE acquired by wear which is slight. 

 The whole plumage becomes paler below and grayer above, 

 the buff tints being lost. 



