336 



REVIEW OF AMERICAN BIRDS. 



[part I. 



I'in-d-yi/lria Ji'"''>yii'i'lis. (Pauiima, 



Vireosylvia flavoTiridis. 



Vireosiilviaflav. Cassin, Pr. A. N. Sc. V, Feb. 1851, 152.— Ib. VI, pi. ii 

 (Panama).— ScLATER, P. Z. S. 185G, 298 (Cordova).— Ib. 1859, 375 

 (Oaxaca ; April). — Ib. Catal. 1861, 44, uo. 2(34. — Sclater & Salvix, 

 Ibis, I, 1859 12 (Guatemala). — Vireo flav. Baird, Birds N. Am. 

 1858, ?,'i2.—Ph!]llomancsJiav. Cab. Jour. 1861, 93 (Costa Rica). 



Hah. From northern border of Mexico to Isthmus of Panama, especially on 

 west side. 



(No. 3,976, % .) 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 

 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 

 aud 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 kss than the fifth. 



This species is of about the size of V. oUvacea, 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 .1)0, 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 



