Wyoming Birds. 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 th£ 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. 



