24 
BULLETIN 1355, U. S. DEPAKTMENT OF AGBICULTURE 
the food, as in most of the other species, but are subordinate to the 
true bugs. 
Hemiptera. — Nearly 46 per cent of all the food eaten by the Hutton 
vireos is composed of true bugs. A little less than half of this, or 
20.15 per cent of the total, consists of stink-bugs (Pentatomidae) . 
So far as the available data show, no stink-bugs are eaten in June 
or July. As the percentage for August is 33.6, however, it is probable 
that more stomachs would give a more even distribution for this 
item. The rest of the bugs do not figure very high until June, from 
which time on they are, in general, the largest element in the diet. 
LgpwZo^era.— Caterpillars, and moths and butterflies are about 
evenly balanced in the total subsistence of the Hutton vireos, the 
caterpillars amounting to 12.22 per cent and the adult forms to 
12.33 per cent. July is apparently the month when this kind of 
food is most in demand. 
Fig, 8.— Yearly summary of the various items in the food of the Hutton vireos ( Vireo huttoni, subspp.), 
based on the analysis of the contents of 70 stomachs 
Coleoptera. — Of the 13.25 per cent representing beetles in the food 
of the Hutton vireos, about five-eighths are ladybird beetles (8.12 
per cent). Ladybirds were found in nearly half the stomachs ex- 
amined and appear to be a common food. Weevils (2.75 per cent) 
were fairly evenly distributed, but the rest of the beetles were found 
only infrequently. 
Hymenoptera. — Hymenopterans were found regularly in the 
stomachs, and rather remarkably, the two months with the high 
averages are December and January. This unusual condition will 
in all probability be modified when additional material is examined. 
Otherwise, the monthly percentages appear to be normal, and the 
average for the year is 6.3 per cent. 
Other insects. — -Insects other than those belonging to the orders 
noted above occur so irregularly in the few stomachs examined that 
it is difficult to make any definite statement on their relative abun- 
dance in the food. During July, when miscellaneous insects should be 
taken in some quantity, none appear to be eaten, whereas in Febru- 
