VIREO. 469 



b^. Smaller (wing less than 2.50) ; bill small, nearly as broad as high at base, 

 and tajsering rapidly to the slender, slightly hooked tip. (Color olive- 

 green or russet-olive above, with top of head and neck ash-gray or else 

 with tail russet ; lower parts neither yellow nor green.) 



Hylophilus. (Page 478.) 

 b^. Larger (wing not less than 3.00) ; bill stout, much deeper than wide at base, 

 the culmen curving rather abruptly toward the strongly hooked tip. 

 c^ Depth of bill at base only about half the exposed culmen. (Lower 

 parts green, becoming yellow on throat, or else white with rufous 

 band across chest ; upper parts bright green, with top of head sky- 

 blue, or else olive, the sides of head striped with yellow, slate-color, 



white, and black.) Vireolanius} 



&. Depth of bill at base much more than half the exposed culmen. (Lower 

 parts yellow ; upper parts plain olive-green, becoming ash-gray on 

 head and neck, the forehead and broad superciliary stripe rufous.) 



Cydorliis} 



Genus VIREO Vieillot. (Page 468, pi. CXY., figs. 1-3, 5.) 



Common Characters. — Above plain olive-green or olive-grayish, with or with- 

 out white wing-bands ; beneath whitish or yellowish, or both. Nest a very beau- 

 tiful basket-shaped structure suspended from a forked twig, composed of mosses, 

 lichens, fine strips of bark, etc. Egg& white, usually more or less dotted or 

 sparsely speckled round larger end with brown and blackish. 



ct}. Spurious primary, if present, very narrow and pointed, and decidedly shorter 

 than tarsus. 

 }?■. "Wing without light bands or other distinct markings. (Subgenus Vireosylva 



BONAP.) 



c\ Without any spurious primary, or else, if present, the exposed culmen 

 .50, or more.* 

 cZ^ Exposed culmen .50, or more ; middle of chest white. 

 e\ A distinct dusky streak along each side of throat. 



Above plain dull olive-greenish, becoming gray on top of 

 head, which has a more or less distinct dusky streak 

 along each side of crown ; a conspicuous superciliary 

 stripe of dull whitish, bordered below by a distinct 

 dusky streak through the eye ; cheeks dull grayish 

 white or pale brownish gray (whole side of head, 

 including superciliary stripe, sometimes strongly suf- 

 fused with dull brownish buffy) ; lower parts white, 



' Vireolanius BoNAP., Consp. i. 1850, 3.30. Type, V. melitophrya Du Bus. 



2 Cyclorhis SwAiNS., Zool. Jour. iii. 1828, 162. Type, Tanagra guinnensis Gmel. 



^ The exception is V. olivaceus, which is said to have sometimes (but very rarely) a spurious primary. 



