464 
Mr. R. Ridgway on the Genus Empidonax. 
blackish general colour of the wings; lower 
parts greyish white, shaded with dull 
greyish across breast, and tinged with pale 
sulphur-yellow. Wing 2*30-2*40 (2-37) 
inches, tail 2-30-240 (2*33), culmen 055- 
060 (0*58), width of bill at base 0-25-0*27 
(0*26), tarsus 0-58-0-59.— Hab. Western 
Ecuador . E. griseipectus. 
e 2 . First quill longer than seventh. 
f 1 . First quill usually shorter than fifth; 
colour above olive or greyish brown, 
never distinctly greenish. 
g 1 . Tail even, or very slightly rounded; 
wing averaging more than 2-60. 
h l . Above olive, usually decidedly greyer 
on head; wing-bands in adult vary¬ 
ing from dull brownish grey or 
greyish brown to nearly white; in 
young deep buff or ochraceous; lower 
parts white, tinged posteriorly with 
sulphur-yellow, and shaded on sides 
of breast with olive-greyish. Male: 
Wing 2-70-2*85 (2*75) inches, tail 
2-35-2-60 (2-51), culmen 0-64-0-73 
(0’69), width of bill at base 0-27- 
0-31 (0-29), tarsus 0-65-0*72 (0-68). 
Female : Wing 2*55-2-65 (2-60), tail 
2-20-2-50 (2*38).— Hab. Western 
North America, north to Sitka and 
Fort Simpson, south (in winter) to 
Mexico... E. pusillm. 
h 2 . Similar to E. pusillus, but averaging- 
more decidedly olivaceous above 
and more distinctly tinged with yel¬ 
low beneath; the bill shorter and 
broader, and the tarsus shorter. Male : 
Wing 2-60-3-00 (2*81), inches, tail 
2-40-2-60 (2-48), culmen 0-60-0-64 
(0-62), width of bill at base 0-29- 
0*30 (0-30), tarsus 0-64-0-67 (0-66). 
Female : Wing 2-50-2-65 (2-58), tail 
2-25-2*35 (2-30).— Hab. Eastern 
North America, south, in winter, 
through Middle America to northern 
South America ., E. pusillus traillii . 
