ila 
Genus CHLANIUS. 
This abundant, genus is represented by twenty-three individuals, 
the next to the largest number studied of any genus of Carabide. 
Six examples from Southern Illinois, collected from April to Sep- 
tember, belong to the species C. diffinis, C. nemoralis, and C. tomen- 
tosus. The animal food of these was about three times the veg- 
etable. Two-thirds consisted of insects, of which caterpillars alone 
were determinable, and earth-worms eaten by one of the beetles 
made about eight per cent. More than half the vegetable food con- 
_ sisted of fungi. Fragments of exogenous plants were recognized in 
one of the beetles. <A single C. diffinis, taken among the cabbage- 
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 distinguishable 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 caterpillars, 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 Telephoride. 
Mites and myriapods (Geophilus) had also been devoured by one. 
GEenus AGONODERUS. 
Fifteen spécimens of the superabundant little beetle Agonodcrus 
comma were studied, ten of which were collected from the ground 
about hills of corn in a field which was badly infested by chinch- 
bugs, and contained also a great many plant lice; while many ants of 
a species everywhere common, were seen about almost every hill. 
Fragments of chinch-bugs were found in four of the beetles, and 
amounted to about one-fifth of the food of all, 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 two per cent. of common fungi. Four 
specimens, from different situations, had made a similar record,. 
differing only by the presence of a few mites in the stomach of one 
of these beetles. Eleven per cent. of fungi was taken by the group 
last mentioned. 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 classi- 
fied. A single Agonoderus, taken among the cabbages, had eaten 
only undeterminable food. 
GrNus ANISODACTYLUS. 
This large and abundant genus is represented by thirty-one speci- 
mens,®*belonging to six species, Nineteen specimens, collected in va- 
