VIREO. 469 



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

 and tapering 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. 1 



c 2 . 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.) 



Cyclorhis. 2 



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



Species. 



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. Eggs white, usually more or less dotted or 

 sparsely speckled round larger end with brown and blackish. 



a 1 . Spurious primary, if present, very narrow and pointed, and decidedly shorter 

 than tarsus. 

 b 1 . "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. 3 

 d l . Exposed culmen .50, or more ; middle of chest white. 

 e 1 . 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 bufly) ; lower parts white, 



1 Vireolanius Bohap., Consp. i. 1850, 330. Type, V. melitophrys Drj Bus. 



2 Cyclorhis Swains., Zool. Jour. iii. 1828, 162. Type, Tanagra gvianensis Gmel. 



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



