VIREOS. 329 



The YELLOW-GREEN VIREO (625. V. flavoviridis), a Mexican and Central 

 American species, has been once recorded from Godbout, Province of Quebec. 



626. Vireo philadelphicus (Cass.). PHILADELPHIA VIREO. Ad. 

 Upper parts light olive-green ; the crown sometimes grayish ; a whitish line 

 over the eye; wings and tail edged with olive-green; no wing-bars; lirst 

 primary nearly as long as second ; entire under parts nearly uniform pale, 

 greenish yellow. L., 4'75 ; W., 2-60 ; T., 1-95 ; B. from N., -26. 



Remarks. The pale, greenish-yellow color spread almost uniformly over 

 the entire under parts distinguishes this bird from our other Vireos. 



Range. Eastern North America; breeds in Manitoba, Maine, and proba- 

 bly north to Labrador ; and winters in the tropics. 



Washington, very rare T. V., May 17. Sing Sing, rare T. V., Sept. 20 to 

 Oct. 20. Cambridge, very rare T. V. in Sept. 



Nest, pensile, of fine grass and birch bark, suspended from a forked branch 

 about eight feet from the ground. Eggs, four, similar in color to those of F. 

 ohvaceus (Thompson). 



This species resembles the Red-eyed Vireo in habits, and Mr. Brew- 

 ster writes that its song is so nearly identical with the song of that spe- 

 cies " that the most critical ear will, in many cases, find great difficulty 

 in distinguishing between the two. The notes of philadelphicus are 

 generally pitched a little higher in the scale, while many of the utter- 

 ances are feebler and the whole strain is a trifle more disconnected. 

 But these differences are of a very subtile character, and, like most 

 comparative ones, they are not to be depended upon unless the two 

 species can be heard together. The Philadelphia Vireo has, however, 

 one note which seems to be peculiarly its own, a very abrupt, double- 

 syllabled utterance with 'a rising inflection, which comes in with the 

 general song at irregular but not infrequent intervals. I have also on 

 one or two occasions heard the male when in pursuit of his mate utter 

 a soft pseuo, similar to that sometimes used by Vireo olivaceus, and 

 both sexes when excited or angry have a harsh, petulant note exactly 

 like that of V. gilvus" (Bull. Nutt. Orn. Club, v, 1881, p. 5). 



627. Vireo gilvus ( Vieill.}. WARBLING VIREO. Ad. Upper parts 

 ashy olive-green ; no wing-bars ; wings and tail edged with the color of the 

 back ; first primary very 



short, not more than 1-00 

 in length ; under parts 

 white slightly washed 

 with yellowish. L., 5-80 ; 

 W., 2-85 ; T., 2-14 ; B. from 

 N. -30 FlG - 92. Wing of Warbling Vireo, to show short first 



primary. 



liange. North Amer- 

 ica; breeds as far north as the Hudson Bay region; winters in the tropics. 

 Washington, rather common S. R., A pi. 28 to Sept. 10. Sing Sing, tolera- 



