160 



The Food of Birds. 



Table of the Food of the Bluebird. (Sialia sialis, L.) 



Number of specimens. 



Kinds of Food. 



I. Insects 



1. Hymenoptera. . 



Formicidas 



Ichneumonidse. 



2. Lepidoptera . . . 



Arctiinae 



Noctuidae 



Phalcenidae 



3. Diptera 



4. Coleoptera 



Carabidse 



Dytiscidae 



Staphylinidas . . 



Histeridse 



Byrrhidae 



Scarabaeidae. . . . 



Aphodius. . . . 



Geotrupes . . . 



Phyllophaga. 



Euryomia . . . 



Elateridas 



Tenebrionidae. . 



108 



Number of specimens, and ratio in wliich 

 each element of food was found. 



I 

 .01 



16 

 .19 



16 

 . 10 



I 



t 

 I 



t 

 I 



.01 

 10 



■33 

 10 



•31 



41 



30 

 8 



71 



5 



32 



2 



4 

 78 

 54 

 I 

 I 

 2 

 I 



32 

 21 



o 



So 

 o ^ 



.2 2 



s 



.78 

 .07 

 .04 

 •03 

 .26 



.01 



12 



.01 



.20 

 .07 



.09 

 .06 



