84 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
VIREO FLAVOVIRIDIS FLAVOVIRIDIS (Cassin) 
Vireosylva flavoviridis Casstn, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 
June 30, 1851, p. 152, pl. 11. (San Juan, Nicaragua.) 
Four from Isla Coiba were shot January 20, 29, 30, and 31. One 
secured January 29 in high forest was evidently on its breeding 
ground as it was displaying and pursuing another. 
The problem of the identity of the yellow-green vireos that breed 
in western Panama still is not clear. The birds available that appear 
to have been on their nesting grounds, including those from Coiba, 
seem brighter colored than V. f. insulanus from the islands in the 
Gulf of Panama, the Canal Zone, and the area to the eastward. They 
thus seem closer to typical flavoviridis, and are so identified. 
VIREO FLAVOVIRIDIS HYPOLEUCUS van Rossem and Hachisuka 
Vireo olivaceus hypoleucus vAN RossEM and Hacuisuxa, Proc. Biol. Soc. 
Washington, vol. 50, Sept. 30, 1937, p. 159. (1,200 feet elevation in San 
Francisco Canyon, lat. 27° N., eastern Sonora, México.) 
The two birds taken on January 19, on the first day of the return 
of this vireo from the south, have the characters of this race, particu- 
larly in the lighter, brighter yellowish green of the sides and flanks. 
They thus resemble the breeding bird of northwestern México, and 
are so identified. 
VIREO PHILADELPHICUS (Cassin): Philadelphia Vireo, Virio de Filadelfia 
Vireosylvia philadelphica Cassin, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 
June 30, 1851, p. 153, pl. 10, fig. 2. (Philadelphia, Pa.) 
A female of this migrant from the north was shot January 23 at 
the border of a mangrove swamp. 
HYLOPHILUS FLAVIPES Lafresnaye: Scrub Greenlet, Verdecillo Comin 
Hylophilus flavipes LAFRESNAYE, Rev. Zool., vol. 8, September 1845, p. 342. 
(Bogota, Colombia.) 
These were among the more common of the small birds, though 
seen infrequently because they ranged among screening leaves and 
creepers. They were found in the scrub growths back of the beaches 
and at the borders of mangroves, and came also into the brushy 
rastrojo of old fields, habitats similar to those inhabited by other 
forms of the species in mainland localities. On Coiba I found that 
they lived also in the high crown of the inland forests, though it was 
near the end of my stay before I verified this, owing to the difficulty 
of detecting small birds in such situations. They move actively among 
