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). Mest 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, .67 x 
51, colored like those of #. diffcilis. Hab. Hast- 
ern North America, breeding from northern 
United States northward; south, in winter, 
through eastern Mexico and Central America 
to Panama.............. 463. E. flaviventris Barrp. 
Yellow-bellied Flycatcher. 
f?. Wing-bands darker than lower parts. 
g. 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 Sct. Baird’s Flycatcher.! 
g. 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 Ripew. Salvin’s Flycatcher.? 
d*. Lower parts partly white. 
é. First quill longer than seventh. 
fi. First quill usually equal to or longer than fifth ; color uni- 
form olive-green or greenish gray above. (Length 
5.50-5.90.) 
Adult: Above varying from greenish gray to olive- 
green, or even (in some winter specimens) almost 
1 Empidonax bairdii Scu., P. Z. 8, 1858, 301. 2 Empidonax salvini Ripew., Ibis, Oct. 1886, 459. 
