WyYoMINc Birps. 69 
624. Vireosylva olivacea: Red-eyed Vireo. 
Knight said it was possibly a summer resident, but quite 
rare and largely confined to eastern Wyoming. The only 
recent record of it is by Walker, who found one at Green 
River well toward the western portion of thp state. This 
specimen was taken during the fall migration of 1911. 
627. Vireosylva gilva gilva: Warbling Vireo. 
Knight considered all records of the Warbling Vireos under 
this head and said: “Summer resident and rather com- 
mon.” The only one reporting it now is Sawyer. All 
other observers record swainsoni. 
627a. Vireosylva gilva swainsoni: Western Warbling Vireo. 
Common summer resident in the foothills and about timber 
over almost the entire state. 
629. Lanivireo solitarius solitarius: Blue-headed Vireo. 
“Accidental. The Wyoming record is based upon a single 
specimen taken by Drexel at Fort Bridger, 1858.” (Knight. ) 
629b. Lanivireo soltarius plumbeus: Plumbeus Vireo. 
Knight said it was probably a summer resident, but that 
there were no breeding records. Peabody has since found 
it breeding in Weston and Crook Counties. 
633. Vireo belli belli: Bell’s Vireo. 
“Probably accidental. The only Wyoming record comes 
from Grinnell, which is as follows: ‘Quite abundant late 
in August among the timber and low brush on the streams 
flowing out from the Freezeout Mountains, where the 
writer took specimens.’” (Knight.) 
MNIOTILTIDAE (Wood Warblers). 
For their size probably no birds consume more insects than the 
Warblers do. They seem to be always hungry and hunting for 
food. They capture almost incredible numbers of small, noxious 
insects. They also eat caterpillars, beetle larvae, and insects of 
various kinds. The Warblers probably rank first among birds as 
insect destroyers. Chapman, in his “Warblers of North America,” 
gives interesting figures on the food of these birds. 
