SFU se 
TYRANNID, FLYCATCHERS.—GEN. 109. 175 
Traill’s Flycatcher. Above, olive-brown, lighter and duller brownish 
posteriorly, darker anteriorly, owing to obviously dusky centres of the 
coronal feathers; below, nearly as in acadicus, but darker, the olive-gray 
shading quite across the breast; wing-markings grayish-white with slight 
yellowish or tawny shade; under mandible pale; upper mandible and feet 
black. Averaging a little less than acadicus; 53-6; wing 23-22, more 
rounded, its tip only reaching about 3 of an inch beyond the secondaries, 
formed by 2d, 3d and 4th quills, as before, but 5th not so much shorter, 
(hardly or not 4 of an inch), the Ist ranging between 5th and 6th; tail 23; 
tarsus %, as before, but middle toe and claw #, the feet thus differently pro- 
portioned, owing to length of toes. Eastern North America to the Plains, 
common; an entirely different bird from acadicus, but difficult to distinguish 
from the following species. AvD., i, 234, pl. 65; Nurv., i, 2d ed. 323; 
TD is5 TAGES SOUS eet i mre oes tentrs eta eT gaa De PO Rw 20 
Var. pusittus of Bp., 194, which replaces true traillii from the Plains to the 
Pacific, may usually be recognized by its more fuscous coloration, the olivaceous 
and yellowish shades of truilliz being subdued ; by its larger bill, and the feet nearly 
as in acadicus. The original Tyrannula pusilla of Swarxson, Fn. Bor.-Am. ii, 144 ; 
Aup., ii, 236, pl. 66, is uncertain, just as likely have been minimus as this bird. 
I therefore pass over the name, which, if belonging here, antedates ¢raillii, and 
adopt traillii for the eastern form (although AupuBon says “Arkansas to the 
Columbia”), taking pusillus of Barrp for the western variety. 
Least Flycatcher. Colors almost exactly as in ¢railii; usually however 
olive-gray rather than olive-brown; the wing-markings, eye-ring and loral 
feathers plain grayish-white; the whole anterior parts often with a slight 
ashy cast; under mandible ordinarily dusky ; feet perfectly black. It is a 
smaller bird than ¢rai/lii, and not so stoutly built ; the wing-tip projects only 
about $an inch beyond the secondaries; the 5th quill is but very little 
shorter than the 4th, the lst apt to be nearer 6th than 5th; the feet are 
' differently proportioned, being much as in acadicus; the bill is obviously 
under 4 an inch long. Length 5-54; wing 22 or less; tail about 24. 
Although it grades up to ¢raillii in size, and has no obviously different color- 
ation, yet I am satisfied that it is a different bird. Eastern North America to 
the Plains, very abundant in the U. 8. during the migrations, in orchards, 
coppices, hedgerows and the skirts of woods rather than in heavy forests. 
Awp., vii, 343, pl. 491; Bp., 195. Pe ese ove eer ete MINIM 4 
Yellow-bellied Flycatcher. Above, olive-green, clear, continuous and 
uniform as in acadicus, or even brighter; below, not merely yellow/sh, as in 
the foregoing, but emphatically yel/ow, bright and pure on the belly, shaded 
on the sides and anteriorly with a paler tint of the color of the back; eye- 
ring and wing-markings yellow; under mandible yellow; feet black. In 
respect of color, this species differs materially from all the rest; none of 
them, even at their autumnal yellowest, quite match it. Size of ¢raill7i, or 
rather less; feet proportioned as in acadicus; bill nearly as in minimus, but 
rather larger; Ist quill usually equal to 6th. Eastern United States, 
