109 
etable food eaten by two of the specimens, and was apparently 
ived chiefly from the seeds of grass. A larger ratio of animal 
d is noticed in the thirteen taken where canker-worms abounded, 
re vegetation amounted to only six per cent,, all of exogenous 
gin, as shown by the branching bundles of spiral cells in the 
fetable fragments noticed, while the animal food amounted to 
f ety-four per cent. 
f from the ratios of animal food taken by the examples from the 
hard we subtract the ratio of canker-worms (fifty-two per cent.) 
remainder is just seven times the ratio of vegetation eaten, 
hailing the percentages of animal and vegetable food taken by 
four specimens first mentioned, we find that here also the former 
almost exactly seven times the latter. This goes to show that 
! canker-worms eaten were in addition to the ordinary ratio of 
mal food taken by this species under the usual conditions. 
Genus Loxopeza. 
>at three specimens of this genus were studied, all L. atriventris. 
dr stomachs contained fragments of insects, pollen and anthers 
blue-grass, and immense numbers of the spores of a fungus 
ibably Plioma) which forms small black specks on dead wood, 
ns of weeds, etc. 
Genus Calathus. 
ix examples of Calathus gregarius, three from DeKalb county 
three from the orchard, were the only representatives of this 
■us. 
ne-third of the food of those first mentioned consisted of cater¬ 
ers, a second third of other insect larvae, and the remainder of 
pollen of grass. The food of the second group was extremely 
ilar, a third consisting, as before, of vegetation, another third 
:anker-worms, and the remainder of insect fragments not further 
uuninable. 
Genus Platynus. 
he stomach of a single P. decorus, taken in the orchard, con¬ 
ned only liquid animal food. Two examples of P. limhatus, both 
n Southern Illinois, in April, had derived about four-fifths of 
r food from the vegetable kingdom, partly seeds of grass and 
fly the parenchyma of exogenous plants. The remainder con- 
3d entirely of Aphides (plant-lice). These specimens were doubt- 
too few to give a correct idea of the average food of the genus 
i whole. 
Genus Etarthrus. 
i 
ive specimens of E. colossus, taken at various dates and places, 
derived about one-tenth of their food from endogens, and the 
ainder wholly from insects. Twenty per cent, eaten by one of 
i beetles was recognized as caterpillars. Scarabieidse are credited 
