100 BIRDS OF CALIFORNIA AFFECTING FRUIT INDUSTRY. 
stomachs of the Arctic bluebird (Stalia arctica) were obtained. 
They were taken in fall and winter, and, while so small a number is 
not sufficient for positive conclusions, it may be said that the charac- 
ter of the food closely resembles that of the other species in the same 
months. 
The two species eat about the same proportion of animal and vege- 
table food; the animal part consists of the same orders of insects, 
while the vegetable part is made up of the same varieties of fruit. 
In short, it may be said that if there are important differences in the 
food habits of the two birds the evidence at hand fails to establish 
the fact. 
SUMMARY. 
It seems scarcely necessary to comment on the foregoing statements 
with regard to the bluebird’s diet in its economic relations. That the 
bird is an eminently useful species is so patent that it hardly needs to 
be pointed out. Whatever harm fruit growers have suffered from 
birds, none of it can be laid at the door of the bluebird. 
List of insects identified in stomachs of bluebirds: 
COLEOPTERA. 
Coccinella t. californica. Blapstinus sulcatus. 
Hippodamia couvergens, Blapstinus pulverulentus, 
Polycaon stoutii. Rhigopsis effracta. 
Aphodius rugifrons, Balaninus sp. 
Blapstinus dilatatus, Sitones sp. 
HEMIPTERA. 
Saissetia olew, Ninea diadema, 
HYMENOPTERA. 
Afessor andrei (ant). 
Insects also were identified as belonging to the following families: 
COLEOPTERA. 
Carabidm. Ptinidxr. 
Staphylinidee. Scarabeeidee. 
Coceinellidie. Cerumbycidee, 
Histeridiv. Chrysomelids. 
FElateridie. Tenebrionide. 
Buprestidie, Ihynchophora (superfamily). 
Liunpyride, 
HEMIPTERA. 
Reduviida, Corimelenide. 
Capsidie. Scutelleridie, 
Lygividie. Jasside. 
Pentatomidie. Coccidie, 
O 
