364 NOTES ON THE 
SPECIFIC CHARACTERS. 
Second and third quills about equal and longest; first a little 
shorter than fourth, but considerably longer than fifth; back, 
rump, edges of wing and tail feathers, bright olivaceous green: 
side of head and neck paler; crown dark ash sharply defined; a 
well defined whitish line from the bill, over the eve nearly to the 
occiput; a dark line separating it above, from the ashy crown; 
a dusky line through the eye; beneath white; under tail coverts 
pale sulphur-yellow; iris red. 
Length, 6.50; wing, 3.50; tail, 2. 
Habitat, eastern North America. 
VIREO PHILADELPHICUS (Cassin). (626.) 
PHILADELPHIA VIREO. 
I had observed the vireos in this section for many years be- 
fore I had the opportunity to see this one, when on the 18th of 
May, 1876, Mr. T. S. Roberts obtained one in the immediate 
vicinity of the city, to which he called my attention. It was 
an excellent specimen of the male in good plumage. Since 
then many have been collected not only in this immediate vi- 
cinity, but most parts of the State; observed in the season of 
migration from Fillmore county, where Dr. Hvoslef obtained it, 
to Clay county, on the Red river, where Mr. Lewis found it 
common, but obtained no nests. That it breeds throughout 
the State I have little doubt, especially along the Red river 
where it has been most commonly met. It retires from the 
State early in September. 
Its general habits are so much like V. gilvus that it is next 
to impossible to distinguish them by their appearance until in 
the hand, but when their note is heard the identity is no longer 
doubtful. Its song has been represented to greatly resemble 
that of V. olivaceus and I may have heard it when I| attributed 
it to that bird, but if the latter is singing at the same time, 
there is no difficulty in distinguishing this one. 
SPECIFIC CHARACTERS. 
Without any spurious primary; second and third quills 
longest; fourth a little shorter; first about .20 of an inch 
shorter than second, and about equal to fifth. Above dark 
olive-green, slightly inclining to ashy on the crown; beneath 
pale sulphur-yellow, brightest on the throat and breast. A 
white line from the bill over the eye, and an obscure white spot 
below it. A dusky line through and behind the eye from the 
commissure. 
Length, 5 inches; wing, 2.75; tail, 2.10; tarsus, .65. 
Habitat, eastern North America to Hudson’s Bay; south in 
winter to Costa Rica. 
