VIREO. 469 



b l . 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 2 . 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 1 . 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*. 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? 



GENUS VIREO YIEILLOT. (Page 468, pi. CXY., 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 l . 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. 8 



d 1 . Exposed culmen .50, or more ; middle of chest white. 

 e l . 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, 



1 Vireolanius BONAP., Consp. i. 1850, 330. Type, F. melitophrys Do Bus. 



2 Cyclorhis SWAINS., Zool. Jour. iii. 1828, 162. Type, Tanagra guianensis GMEL. 



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



