The Regulative Action of Birds upon Insect Oscillations. 



§7 



GENERA AND SPECIES RECOGNIZED IN THE FOOD. 



The following lists are intended to supplement the preceding 

 tables and, taken together with tliein, to present all the details 

 concerning the food of the birds observed in the orchard, upon 

 which the foregoing discussion is based. In the first list the genera 

 and species recognized in the food of each kind of bird are 

 given separately ; in the second the food elements are systemati- 

 cally arranged, and against the name of each element the names 

 of all the species of birds are placed in whose food that element 

 was recognized. The figures preceding the names of the birds 

 in the second list indicate the number of individuals in which the 

 given element was found : 



TUKDID.^. 



Tardus migratorlus ' Helix, Hyalina, Limnea humilis, Formica, 

 Nephelodes violans, Anisopteryx vernata, Elaphrus ruscarius, 

 Staphylinus badipes, Aphodius, A. inquinatus, Phyllo- 

 4 



