The Food B('lafiont< of' the Carabidir and Cocci nellidn'. 87 



collections iVoni the orchard infested hy canker-worms, and the 

 corn-fields at Jacksonville and Xornial overnni by chimrh-but^s, 

 were made by myself. 



In the following discnssion, each o-enus is taken up separately, 

 and the details of its food are given both under general circum- 

 stances, as shown by specimens from miscelhiiieons situations, and 

 also under the various peculiar conditions illustrated by the 

 special collections, made for the purpose of exhibiting the food of 

 tliese inserts as related to particularly injurious species, and these 

 an^ followed by a summary and discussion of the food of each 

 family, taken as a unit. The tables exhibit, first, the food of the 

 family luider ordinary circumstances; second, under peculiar con- 

 ditions; and, third, und(M- all the circumstances, taken together. 



FAMILY CARABID^. 



My notes upon the food of this family are derived from the 

 dissection and study of one hundred and seventy-five specimens, 

 representing thirty-eight species and twenty genera. Eighty-two 

 specimens were collected in miscellaneous situations, twelve were 

 taken in a field infested by cabbage-worms, ten in a corn-field 

 overrun by chinch-bugs, and seventy-one in an orchard which 

 was being destroyed by canker-worms. The first collection of 

 eighty-two specimens from various situations represented thirty- 

 two species, belonging to eighteen genera. They were obtained 

 in different parts of the State, from DeKalb County in the north 

 to Union in the south, and at all seasons of the year, from April to 

 October; and doubtless represent fairly well the food of the 

 family in rilinois during the entire year. The collections illus- 

 tratiniJ- the food of the Carabidae as relatcid to the cabbajre-worm 

 were made in a field of young plants at Normal, 111., in April, 

 1882, where the larva^ of At i rot is aiuiexa were abundant and 

 destructive. The collection showing the food of this family in 

 the* presence of the chinch-bug, consisted of ten specimens of a 

 single species found in .luly, 1882, very abundant about the roots 

 of corn in a field where the bases of the stalks were largely cov- 

 ered by young chinch-bvigs. The third special collection con- 

 sisted of seventy-one insects, representing nineteen species, ob- 

 tained in May of two successive years (1881 and 1882) in an 



