The Food Relations of the Carabida: and Coccinellidai. 
41 
Genus Evarthrus. 
Five specimens of E. colossus, taken at various dates and 
places, had derived about one-tenth of their food from endogens, 
and the remainder wholly from insects. Twenty per cent., eaten 
by one of the beetles, was recognized as caterpillars. Scarabae- 
idae are credited with another twenty per cent., and undetermined 
larvae of Coleoptera with about an equal ratio. Minute quantities 
of fungi were noticed in the stomachs of two of these beetles, 
and traces of undetermined Algae in one. 
Two examples of E. sodalis , taken in the Tazewell County 
orchard, had consumed only insects, all canker-worms, except 
traces of an ant and a single gnat. 
The insect ratio of the genus as represented by these seven 
specimens, stands at ninety-three per cent. » 
Genus Pterostichus. 
Thirteen specimens were dissected, representing E. pennun- 
dus , P. sayi , and P. lucublandus . 
The number of each species is not sufficient to give distinctive 
food characters, and the genus may therefore best be treated as a 
whole. Seven of the specimens, taken in miscellaneous situa- 
tions in Central Illinois in April, May, and September, had found 
about one-fourth of their food in the vegetable kingdom, about 
one-third of which consisted of undetermined fungi, and the 
remainder chiefly of exogenous plants. A few spores of Helmin- 
thosporium, probably accidental, were noticed in the stomach of a 
single beetle. Forty-three per cent, of the food consisted of 
insects, among which Hymenoptera only were recognized. A 
single mite occurred in one of the beetles. Three specimens 
taken in the orchard infested by canker-worms, had eaten endo- 
genous vegetation, to the amount of about one-fifth of their food. 
Caterpillars made eleven per cent., and undetermined insects two 
per cent., the remaining ratio being accounted for by the presence 
of liquid animal food. Two-thirds of the contents of three 
specimens taken among the cabbages, consisted of animal matter, 
half of which was clearly recognized as the larvae of Agrotis 
(tunexa infesting the field. The remaining third, composing the 
