Western Warbling Vireo 433 
pair collected 22nd to 24th May, 1899 (Aiken); Yuma, seen by Miss 
Patten, May 27th, 1905 (Henderson) ; Boulder, one male taken May 
30th, 1904, by L. C. Bragg,and Wray, one male taken May 26th, 1906, 
W. C. Ferril (H. G. Smith.) Allen (72) states, ‘‘mountains of Colorado 
up to 11,000 feet,” but this seems based on an error, as it has not since 
been met with away from the eastern plains. 
Habits.—These birds are found mostly along timbered 
streams, and are often met with near dwelling-houses 
in groves and among shade trees ; they have an animated 
song, consisting, according to Goss, of a few clear warbling 
notes repeated in a loud, animated and almost continuous 
strain while seated on the topmost branches of a tree. 
Their food consists chiefly of insects, which they hunt 
for among the leaves and branches and also catch on 
the wing, but small berries are also relished. Their 
nests are suspended from the forks of the trees ; they are 
made of fibres, vine stalks, old leaves and spider threads, 
woven in and fastened together with saliva and lined 
with fine stems and rootlets. They are hung by material 
_of the same kind fastened to the rim. The eggs, three 
to five in number, are pure white, thinly and irregularly 
speckled with reddish-brown, and measure about ‘82 x ‘56. 
Western Warbling Vireo. 
Vireosylva gilva swainsoni. 
A.O.U. Checklist no 627a—Colorado Records—Allen 72, pp. 149, 
156, 176; Aiken 72, p. 198; Henshaw 75, p. 221; Scott 79, p. 93; 
Minot 80, p. 229 ; Drew 81, p. 89 ; 85, p. 15 ; Tresz 81, p. 288 ; Allen & 
Brewster 83, p. 160 ; Beckham 85, p. 141 ; Morrison 88, p. 73 ; Kellogg 
90, p. 89; McGregor 97, p. 39; Cooke 97, pp. 19, 112, 218; Keyser 
02, pp. 198, 230; Henderson 03, p. 237 ; 09, p. 239 ; Warren 06, p. 23 ; 
Gilman 07, p. 194 ; Rockwell 08, p. 176. 
Description.—Male—General colour dark slaty-grey, darkest on 
the head, washed with olive-green on the back and edges of the wings ; 
the inner webs of the wing and tail-feathers edged with white ; a white 
superciliary line from the base of the bill to above the ear-coverts, 
and an indistinct line of dusky below; under-parts whitish, faintly 
washed with olive-yellow, especially on the flanks; tenth (outer) 
EE 
