336 REVIEW OF AMERICAN BIRDS. [PART I. 
Vireosylvia flavoviridis. 
Vireosylvia flav. Cassin, Pr. A. N. Sc. V, Feb. 1851, 152.—Is. VI, pl. ii 
(Panama).—ScuatTer, P. Z. 8. 1856, 298 (Cordova).—Is. 1859, 375 
(Oaxaca; April).—Is. Catal. 1861, 44, no. 264.—Scuarer & Savin, 
Ibis, I, 1859 12 (Guatemala).— Vireo flav. Bairp, Birds N. Am. 
1858, 332.—Phyllomanes flav. Cas. Jour. 1861, 93 (Costa Rica). 
Hab. From northern border of Mexico to Isthmus of Panama, especially on 
west side. 
(No. 3,976, 4.) Above olive green; the whole top of head and nape ash 
color, the edges of this cap, and a loral line dusky, but not very decidedly so. 
A grayish-white line from 
nostrils over the eye. Be- 
neath white, the sides of the 
neck, breast, and body bright 
olivaceous-yellow ; the axil- 
lars and crissum rich sul- 
phur yellow. On the breast 
the yellow extends almost 
to the median line, the color 
of opposite sides separated 
| Vireosylvia flavoviridis. (Panama.) by a narrow interval. Quills 
dusky brown; margined ex- 
ternally, except at ends of primaries, with olive green, internally with grayish- 
white of a decided yellow shade. Tail feathers dark olivaceous-brown, bright 
olive externally, internally olivaceous-yellow. Iris yellow or “red.” 
Bill horn-color, paler below. Legs plumbeous. Wings long and pointed. 
Second and 3d quills nearly equal; 4th a little less; 1st about intermediate 
between 4th and 5th. 
(No. 3,976.) Total length, 6.00; wing, 3.20; tail, 2.60; difference of 1st 
and 2d quills, .30, of 2d and 5th, .15, of 9th and longest, .70; length of bill 
from forehead, .70, from nostril, .45, along gape, .85; tarsus, .70; middle toe 
and claw, .58, claw alone, .14; hind toe and claw, .42, claw alone, .20. 
Specimens appear to vary somewhat in intensity of coloration, 
size and shape of bill, and in dimensions, but little otherwise. The 
sexes are similar. The wing formula above mentioned is the preva- 
lent, though in a few instances the first quill is about equal to or a 
very little less than the fifth. 
This species is of about the size of V. olivacea, or a little larger; 
the tail longer proportionally, the wings shorter and much less 
pointed. The wing formula is much the same, but the difference of 
the shortest and longest primaries is about .70, instead of .90, as in 
olivacea. The bills are not dissimilar; the coloration, however, 
appreciably different. The dusky lines over and through the eye 
are much less vivid, the white one less distinct. The decided olive 
yellow of the entire side of body from neck to crissum, extending 
