38 
The Food Relations of the Carabidce and Cocciuellida’. 
orchard which had been infested for several years with the canker- 
worm to such an extent as to cause the total destruction of a 
large part of the trees. 
Genus Calosoma. 
This genus is represented by three specimens of C. scrutator, col- 
lected in the orchard with the canker-worms, and by nine of 
C. calidum, which were variously distributed. The C. scrutator was 
found to have eaten only animal food, about two-thirds of which 
was recognizable as of insect origin. The remaining third was 
due to the occurrence of liquid animal food, or the fluid to which 
I have given this interpretation. In the stomach of one of the 
beetles the insect food consisted only of minute particles of a 
reddish brown crust which it was impossible to classify further. 
A single C. calidum, taken in May in Central Illinois, contained 
only liquid animal food. Seven specimens, taken in the orchard 
above-mentioned, had likewise fed upon animal food alone, forty 
per cent, recognizable as insects, and the remainder not otherwise 
determinable. As far as can be judged from the contents of the 
alimentary canal in these thirteen specimens,* the species of this 
genus are strictly carnivorous, and have the habit either of suck- 
ing the juices of their prey, or of selecting only those parts most 
easily masticated, reducing these to indistinguishable fragments. 
Certainly there was not the slightest trace of vegetable food in 
any of these beetles.* 
Genus Scakites. 
Two specimens of 8. subterraneus, taken in 1882, one at 
Normal and the other at Anna, in Southern Illinois, had eaten 
only animal food, one-half of which was unrecognizable, and the 
remainder insects. Four specimens of the same species, taken in 
the cabbage-field, have a precisely similar record. 
These nineteen specimens, belonging to three species, were the 
only examples of Carabidce proper whose food was studied, and 
all agreed in a strictly carnivorous character. 
*Mr. F. M. Webster has seen a C. calidum eating a small grasshop- 
per. 
