FOOD HABITS OF THE VIKEOS 
13 
and wild grapes (Vitaceae) were identified in only one or two stomachs 
each. No cultivated fruits or seeds were found, and there is nothing 
in the list of vegetable items to discredit the bird in any way. Al- 
though 18.71 per cent of the September food was of vegetable origin, 
the seasonal average from the stomachs available amounts to but 
7.22 per cent. 
SUMMARY 
Outstanding features of the food habits of the Philadelphia vireo 
are its moderate consumption of vegetable food and the compara- 
tively high percentage of ladybirds. This last item appears to be 
the one blot on the escutcheon of all members of the family of vireos. 
The rarity of the Philadelphia vireo, however, insures that it will 
do little harm in reducing the numbers of ladybird beetles. 
THE WARBLING VIREOS 
Vireosylva gilva, subspp. 
The warbling vireo in its two subspecies is one of the more common 
of the vireos over the entire United States. A total of 356 stomachs 
were available for examination from 29 States and the District of 
V<^r |^g. Egg 
Fig. 4.— Monthly proportions of the various items in the food of the warbling vireos ( Vireosylva gilva, 
subspp.), based on the analysis of the contents of 340 stomachs, with the average of each item for the 
year 
Columbia and a few from southern Canada. Of these, 340 contained 
sufficient food to permit the estimation of percentages of the various 
items. 
Between 5 and 6 per cent of the food consumed by the warbling 
vireos during the year is of vegetable origin. This is considerably 
less than half the proportion taken by the red-eyed vireo. The 
food of animal origin is discussed under its several classes. (See 
fig. 4.) 
