EMPIDONAX. 



341 



culmen .48-.59 (.54), bill from nostril .30-.32 (.31), 

 width at base .25-28 (.26), tarsus .64-.68 (.66). 

 Female: Wing 2.40-2.50 (2.45), tail 2.00-2.25 

 (2.11). Nest embedded in mossy bank, stump, or 

 log, composed of green moss, dry leaves, fine 

 sticks, etc., lined with fine black rootlets, dried 

 grass-blades, etc.; external diameter about 4.00- 

 4.50, depth about 2.25-4.00; cavity about 1.25- 

 1.50 deep by 2.00 across. Eggs usually 4, .73 X 

 .51, colored like those of E. difficilis. Hab. East- 

 ern North America, breeding from northern 

 United States northward; south, in winter, 

 through eastern Mexico and Central America 



to Panama 463. E. flaviventris Baird. 



Yellow-bellied Flycatcher. 

 / 2 . "Wing-bands darker than lower parts. 

 g 1 . Above dull olive. 



Adult: Above dull olive, the wing-bands dull 

 light olive, sometimes inclining to russet; 

 lower parts pale olive-yellowish, more de- 

 cidedly olivaceous on breast; edge of wing 

 dull ochraceous or fulvous; wing 2.60-2.80 

 (2.72), tail 2.40-2.55 (2.49), culmen .58-.60 

 (.59), bill from nostril .32-.33 (.32), width at 

 base .25, tarsus .65-.70 (.68). Hab. Southern 

 and eastern Mexico (Oaxaca, Cordoba, Mira- 

 dor, etc.). 



E. bairdii Scl. Baird's Flycatcher. 1 

 g 2 . Above bright olive-green. Adult: Above bright olive- 

 green, the wing-bands similar, but paler, some- 

 times inclining to ochraceous ; lower parts green- 

 ish sulphur-yellow, distinctly shaded across breast 

 and along sides with olive-green ; edge of wing 

 clear sulphur-yellow ; wing 2.50-2.90 (2.75), tail 

 2.15-2.65 (2.44), culmen .60-.63 (.61), bill from 

 nostril .32-35 (.34), width at base .28-.30 (.29), 

 tarsus .68-.72 (.70). Hab. Highlands of Guatemala. 

 E. salvini Eidgw. Salvin's Flycatcher. 2 

 Lower parts not distinctly yellowish. 

 e 2 . First quill longer than seventh. 



f 1 . First quill usually equal to or longer than fifth ; color uni- 

 form olive-green or greenish gray above. (Length 

 5.50-5.90.) 



1 Empidonax bairdii Scl., P. Z. S. 1858, 301. 



2 Empidonax salvini Ridqw., Ibis, Oct. 1886, 459. 



