The Food Relations of the Carabidce and Cocdnellid<je. 
51 
basal processes or broad opposed surfaces, vegetable food 
is found to predominate. Oalosoma is an example of the first of 
these classes, Chlmnius of the second, and Anisodactylus of the 
third. The seeming exceptions to this generalization shown by 
the tables at the close of the paper, are found among those genera 
of which too few specimens have been studied to warrant general 
conclusions respecting their food. 
FAMILY COCCINELLIDAC. 
This family shares with the preceding the credit of limiting 
the multiplication of other insects, but was shown 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 Coccinellida? made since that 
time have afforded the material for a much 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 Coccinellida? 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- 
cinellidae 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 larvae were collected, and the facts here 
given consequently relate almost wholly to the adult beetles. 
Genus Hippodamia. 
Eleven specimens of FI. maculata , taken in Northern, Central, 
and Southern Illinois at various seasons of the year, from April to 
7 
