The Food Relations of the Carabidce and Coccinellidce. 
43 
bage-worms, had eaten only insects, chiefly a caterpillar, and a 
larva of a beetle. A mere trace of endogenous vegetation was 
also detected. Of sixteen specimens collected among the canker- 
worms, three were C . erythropus , and thirteen C. diffinis. Cut- 
worms made about one-third of the food of the first, and earth- 
worms the remaining two-thirds. The latter were easily distin- 
guishable by the peculiar spines mixed with dirt in the stomachs 
of the beetles. About ninety per cent, of the food of the other 
species was of animal origin, and about half the vegetable food 
was fungi. Insects made seventy-two per cent., nearly half cater- 
pillars, of which the greater part (thirty-one per cent.) was canker- 
worms. Fragments of a fly were observed in one of the beetles, 
and another had eaten one of the Telephoridce. Mites and myria- 
pods (Geophilus) had also been devoured by one. 
Genus Agonoderus. 
Fifteen specimens of Agonoderus were studied, ten of which 
were those already referred to as representing the food relations of 
these beetles to the chinch-bug. Fragments of that insect 
amounted to about one-fifth the food of all, and were found in 
four of the beetles; and plant-lice, taken by half that number, 
amounted to about eight per cent. A single ant, Lasius flavus , 
eaten by one, was rated at five per cent.; and other insects 
brought the general average of the class up to thirty-five per 
cent. Vegetation made just half the food, all fragments of the 
higher plants except one per cent, each of Helminthosporium 
and Peronospora. A single Agonoderus, taken among the cab- 
bages, had eaten only undeterminable a + i ireu d food. Four speci- 
mens from various situations had made a similar record, differing 
only by the presence of a few mites in the stomach of one of the 
beetles. Eleven per cent, of fungi, taken by the group last 
mentioned, was derived from Ramularia and Coleosporium. The 
circumstances of capture, together with the contents of the 
stomach of one of these beetles, indicated that it had made its 
meal chiefly from the seeds of June grass, but the remainder of 
the vegetable food could not be more definitely classified. 
6 
