THE WARBLERS AND THE VIREOS. 121 



two-winged flies, grasshoppers, bugs, and sometimes dog- 

 wood-berries. The young are known sometimes to be fed 

 with grasshoppers. Canker-worms formed forty-four per 

 cent, of the food of three specimens shot in an orchard 

 infested by these pests. 



The YELLOW-THROATED VIREO is a larger bird than either of 

 those above mentioned. It is common in the eastern regions 

 of North America, and feeds on caterpillars, including meas- 

 uring worms, moths, weevils and other beetles, grasshoppers, 

 leaf-hoppers, and various flies. It evidently is a highly bene- 

 ficial bird. 



The WHITE-EYED VIREO is abundant in the Eastern States as 

 far north as Massachusetts, and is occasionally found as far 

 west as the base of the Rocky Mountains. It usually haunts 

 clearings where there is much underbrush. Dr. Brewer 

 reports that it feeds on canker-worms, and De Kay says it 

 eats insects and berries. No precise records of the examina- 

 tion of the stomach contents appear to have been published, 

 but its diet is probably similar to that of the other species of 

 the genus. Judd summarizes 1 the food of ten specimens of 

 this species along with that of fifteen specimens of other 

 species. Ninety-one per cent, of the food of the twenty-five 

 vireos consisted of insects and nine per cent, of the fruit of 

 mulberries and sassafras. 



1 Birds of a Maryland Farm, U. S. Biol. Surv., Bull. 17, p. 102. 



