Mr. R. Rid gw ay on the Genus Empidonax. 467 
across breast and along sides with 
olive-green ; edge of wing clear 
sulphur-yellow. Wing 2*50-2*90 
(2*75) inches, tail 2*15-2*65 
(244), culmen 0*60-0*63 (0'61), 
width of bill at base 0*28-0*30 
(0-29), tarsus 0*68-0-72 (0*70).— 
Hob. Highlands of Guatemala . . E. salvini. 
i' 2 . Above bright greenish olive (vary¬ 
ing to tawny olive), the wing- 
bands more ochraceous; lower 
parts bright sulphur-yellow, 
faintly shaded across breast with 
tawny olive; edge of wing vary¬ 
ing from light saffron-yellow to 
deep ochraceous buff. Wing 2*25- 
2*70 (2*48) inches, tail 2*05-2*40 
(2*22), culmen 0*53-0*61 (0*59), 
width of bill at base 0*29-0*32 
(0*30), tarsus 0*63-0*70 (0*65).— 
TIab. Costa Rica, Veragua, and 
Chiriqui . E.Jlavescens, 
i 2 . Width of bill at nostrils less than half the length of 
the exposed culmen. 
b ] . Outer web of outer tail-feather not abruptly paler 
than inner web : culmen 0*55 inch or less; tarsus 
less than 0*70. 
Above olive, usually more greyish anteriorly, espe¬ 
cially on hind neck; wing-bands dull light 
olive-greyish; lower parts varying from dull 
greyish white, faintly tinged posteriorly with 
sulphur-yellow, to decided olive-yellowish, the 
breast always strongly shaded with olive or olive- 
greyish, the throat never distinctly whitish. 
Male : Wing 2*60-2*80 (2*72) inches, tail 2*30- 
2*50 (2*38), culmen 0*53-0*59 (0*56), width of 
bill at base 0*22-0*24 (0*23), tarsus 0*60-0*68 
(0*63). Female : Wing 2*45-2*75 (2*61), tail 
2*15-2*40 (2*25).— Hob. Western North Ame¬ 
rica, north to Lesser Slave Lake, south, in 
winter, to Southern Mexico . E, hammondi. 
b 2 . Outer web of outer tail-feather abruptly paler than 
the inner web (usually distinctly dull whitish): 
culmen 0 58 inch or more; tarsus usually more 
than 0*70. 
