The Food Relations of the Carabidce and Cocdnellid(v. 51 



basal processes or broad opposed surfaces, vegetable food 

 is found to predominate. Calosoma is an example of the first of 

 these classes, Chla?nius of the second, and Anisodactylus of the 

 third. The seeming exceptions to this generalization shown by 

 the tables at the close of tlie paper, are found among those genera 

 of which too few specimens have been studied to warrant general 

 conclusions respecting tlieir food. 



FAMILY COCCINELLID^E. 



This family shares with the preceding the credit of liiniting 

 the multiplication of other insects, but was sliown in the Bulletin 

 of the Laboratory previously mentioned, apparently to depend 

 largely while in the adult stage upon fungi and other vegetable 

 food. The notes in the paper mentioned referred, however, to so 

 small a number of specimens as to make this conclusion of doubt- 

 ful value. Numerous dissections of Coccinellid;e made since that 

 time have afforded the material for a mucli more comprehensive and 

 thorough treatment of the subject, and the results of a careful study 

 of thirty-nine slides are herewith given. The Aphis-eating habit of 

 the Coccinellid;e is a fact of such easy observation, and is so 

 thoroughly well known, that I have not thought it worth while to 

 investigate especially the food of beetles of this family taken 

 among plant-lice. 



The collections from which the present notes are derived, are 

 from a variety of miscellaneous situations, and also from a corn- 

 field mentioned in the notes on the food of the preceding family, 

 in which chinch-bugs were superabundant, the purpose of the 

 latter collection being to determine the food relations of the Coc- 

 cinellidre to those insects. It so happened that the same field 

 was infested by the corn Aphis in great numbers, and the speci- 

 mens obtained therein consequently illustrate to some extent the 

 food of the lady-bugs in the presence of plant-lice. It was in 

 this last situation only that larv:e were collected, and the fact^; here 

 given consequently relate almost wholly to the adult beetles. 



Genus Hippodamia. 



Eleven specimens of //. mw'ulatd^ taken in Northern, Central, 

 and Southern Illinois at various seasons of the year, from April to 



