38 The Fond Helations of the Garabidce and CocciuelUdn'. 



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 tlie trees. 



Genus Calosoma. 



This genus is represented by three specimens of C. scmt(/tor, col- 

 lected in the orchard with the canker-worms, and by nine of 

 C. calidwn, which were variously distributed. The C. scrutator was 

 found to have eaten only animal food, about two-thirds of which 

 was recoo'nizable as of insect oriafin. The remainingf 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 (J. calidutn., 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 Scarites. 



Two specimens of S. suhterrcm,eus^ 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 Carabidm 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. 



