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vegetable food eaten by two of the specimens, and was apparently 
derived chiefly from the seeds of grass. A larger ratio of animal 
food is noticed in the thirteen taken where canker-worms abounded. 
Here vegetation amounted to only six per cent., all of exogenous 
origin, as shown by the branching bundles of spiral cells in the 
vegetable fragments noticed, while the animal food amounted to 
ninety-four per cent. 
If from the ratios of animal food taken by the examples from the 
orchard we subtract the ratio of canker-worms (fifty-two per cent.) 
the remainder is just seven times the ratio of vegetation eaten. 
Recalling the percentages of animal and vegetable food taken by 
the four specimens first mentioned, we find that here also the former 
is almost exactly seven times the latter. This goes to show that 
the canker-worms eaten were in addition to the ordinary ratio of 
animal food taken by this species under the usual conditions. 
Genus LoxoprEza. 
But three specimens of this genus were studied, all ZL. atriventris. 
Their stomachs contained fragments of insects, pollen and anthers 
of blue-grass, and immense numbers of the spores of a fungus 
(probably Phoma) which forms small black specks on dead wood, 
stems of weeds, ete. 
Genus CaLATHUS. 
Six examples of Calathus gregarius, three from DeKalb county 
and three from the orchard, were the only representatives of this 
genus. 
One-third of the food of those first mentioned consisted of cater- 
pillars, a second third of other insect larve, and the remainder of 
the pollen of grass. The food of the second group was extremely 
similar, a third consisting, as before, of vegetation, another third 
of canker-worms, and the remainder of insect fragments. not further 
determinable. 
Genus PLATYNUS. 
The stomach of a single P. decorus, taken in the orehard, con- 
tained only liquid animal food. Two examples of P. limbatus, both 
from Southern Illinois, in April, had derived about four-fifths of 
their food from the vegetable kingdom, partly seeds of grass and 
partly the parenchyma of exogenous plants. The remainder con- 
sisted entirely of Aphides (plant-lice). These specimens were doubt- 
less too few to give a correct idea of the average food of the genus 
as a whole. 
Genus EVARTHRUS. 
Five specimens of FH. 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. Scarabeide are credited 
