474 NORTH AMERICAN BIRDS. 



(3.16), tail 2.30-2.55 (2.41), bill from nostril .30-.35 

 (.31), tarsus .72-.79 (.TS). Eggs .79 X -59. Hah. 

 Eocky Mountain district of United States ; south, in 

 winter, through central Mexico.... 6296. V. solitarius 

 plumbeus (Coues). Plumbeous Vireo. 

 a?. Spurious primary always present and well developed, equal to or longer than 

 tarsus, and broad, like other quills ; wing more rounded. (Subgenus 

 Vireo.) 

 h^. Wing much longer than tail (the difference equal to or greater than length 

 of bill from nostril). 

 c^. Sides olivaceous or yellowish. 



d}. Median lower parts pure white or buflfy w^hite, in marked contrast 

 with olive-greenish or yellowish of sides and flanks. 

 e\ "Wings blackish or dusky, the middle and greater coverts 

 broadly and sharply tipped with white or pale sulphur- 

 yellow. 

 p. Lores and orbital ring white ; cheeks and ear-coverts 

 black or deep brownish gray, in marked contrast with 

 pure white or buffy white of throat. 



Adult male : Top and sides of head deep black, the 

 lores and orbital ring pure white ; lower parts 

 pure white, the sides and flanks olive-greenish, 

 tinged with yellow ; upper parts olive-green, the 

 wings and tail black, with pale olive-yellow 

 edgings. Adxdt female similar to male, but black 

 of head usually duller, more slate-colored. Young 

 m first autumn and winter : Top and sides of head 

 dull grayish brown ; lores, orbital ring, and lower 

 parts dull buffy white, or pale dull buffy, the 

 sides brown-olive ; upper parts more brownish 

 than in adult. Length 4.40-4.75, wing 2.15-2.30, 

 tail 1.80-2.00. Nest 3-5 feet from ground, in 

 bushes or small trees. Eggs usually 4, .72 X -51, 

 plain white. Hab. Southern portion of Great 

 Plains, north to Kansas ; in winter, south into 



Mexico (Mazatlan, etc.) 630. V. atricapillus 



WooDH. Black-capped Vireo. 

 /'. Lores and orbital ring yellow ; cheeks and ear-coverts 

 grayish, fading gradually into grayish white of 

 throat. (Above olive-green, usually tinged, more or 

 less, with ashy on hind-neck ; wings and tail dusky, 

 with light olive-green edgings; chin, throat, and chest 

 grayish white; belly and under tail-coverts pure white, 

 the latter usually faintly tinged with sulphur-yellow ; 

 sides and flanks sulphur-yellow, tinged with olive. 



