426 VIREOS 



The YELLOW-GREEN VIREO (625. Vireosylva flavoviridis flavoviridis) , a 

 Mexican and Central American species, has been once recorded from God- 

 bout, Province of Quebec. 



626. Vireosylva philadelphica Cass. PHILADELPHIA VIREO. Ads. 

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

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

 primary nearly as long as second; entire underparts 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 underparts distinguishes this bird from our other Vireos. 



Range. E. N. Am. Breeds in Canadian zone from n. and cen. Alberta, 

 n. Man., n. Ont., N. B., and Maine, to n. Mich, and N. H.; winters from 

 Cozumel Is. and Guatemala to Veragua. 



Washington, very rare T. V., May; Sept. Ossining, rare T. V., Sept. 

 20-Oct. 20. Cambridge, rare T. V. Glen Ellyn, rather rare T. V., May 14, 

 15; Aug. 21-Sept. 30. SE. Minn., uncommon T. V., May 9. 



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

 about eight feet from the ground. Eggs, 4, similar in color to those of V. 

 olivacea (Seton). Date, Duck Mt., Man., June 4. 



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, 1880, p. 5). 



1897. DWIGHT, J. D., JR., Auk, XIV, 259-272 (biography). 



627. Vireosylva gilva gilva (Vieill.}. WARBLING VIREO. Ads. 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 I'OO in length; underparts white 

 slightly washed with yellowish. L., 5*80; W., 2*85; T., 2'14; B. from N., '30. 



Range. E. N. Am. Breeds in Transition and Austral zones from se. 

 Alberta, n. Man., cen. Ont., and N. S. s. to nw. Tex., s. La., N. C., and Va.; 

 winter home unknown, but s. of the U. S. 



Washington, rather common S. R., Apl. 21-Sept. 12. Ossining, tolerably 



common, S. R., May 3- 

 Sept. 18. Cambridge, lo- 

 cally common S. R., May 

 5-Sept. 15. N. Ohio, abun- 

 dant S. R., Apl. 17-Oct. 10. 

 Glen Ellyn, not common S. 

 R., May 1-Sept. 15. SE. 



FIG. 113. Wing of Warbling Vireo, to show Minn., common S. R., May 



short first primary. 3 Sept. 15, 



