1i7 
Genus Hrppopamia. 
Eleven specimens of H. maculata, taken in Northern, Central and 
Southern Illinois at various seasons of the year, from April to Sep- 
tember, give an average of forty-six per cent. of animal food, all 
insects excepting a few mites eaten by three of the beetles, and 
amounting to only one per cent. of the food. The insect ratio, as 
far as recognized, with the exception of a single Podura, consisted 
wholly of plant-lice, which amounted to thirty-five per cent., while 
the fifty-four per cent. of vegetable food contained only pollen of 
plants and spores of lichens and fungi, the pollen and spores oc- 
curring in about equal quantities. The former was chiefly from 
flowers of grass and composite plants, about seven per cent. of the 
first and fifteen per cent. of the second. 
Three specimens of this species, taken in the corn-field at Jack- 
sonville, had eaten much smaller ratios of animal food, which 
amounted to only thirteen per cent., all insects. Traces of plant- 
lice were recognized, but no structures of chinch-bugs occurred. All 
but five per cent. of the vegetable food was derived from spores of 
fungi. Three per cent. of the spores of lichens, and two per cent. 
of the pollen of rag-weed and other Composite, complete the record. 
Four examples of H. convergens, all taken at Normal in August 
and September, had eaten about the same amount of animal food as 
the preceding species (forty per cent.), but differed in the distribu- 
tion of it by the fact that one of the specimens had eaten a myria- 
pod (Geophilus), and that a caterpillar had been taken by another. 
Insects proper amounted to but twenty-five per cent., over half 
plant-lice. The vegetable food of this species stands at fifty-six per 
cent., as compared with fifty-four of the preceding, and the ratios 
under this head are very similar to those just given for the other 
species. Pollen of Composite (dandelion) makes thirteen per cent., 
that of grass makes five per cent., spores of lichens two, and those 
of fungi thirty-three per. cent. 
Five adults, taken at Jacksonville, were found to have made 
about one-third of their food of insects, equally divided between 
plant-lice and chinch-bugs, each eaten by one of the beetles. The 
vegetation consisted, as usual, of pollen of Composite (eleven per 
cent.), spores of lichens (two per cent.), and of fungi (seventy-one 
per cent.) 
Two larve of this species, taken at the same place and time, 
differed but little in food, to my surprise, from the adults just 
mentioned. Chinch-bugs and plant-lce in about equal ratios, with 
traces of unrecognizable insects, amount to twenty-three per cent. 
Pollen of Composite stands at five per cent., lichen spores at 
seven, and spores of fungi at sixty-five. 
H. glacialis was represented by four specimens, taken in the corn- 
field. The differences between their food and that of H. convergens 
were purely trivial. Insects amount to thirty per cent., all chinch- 
bugs and plant-lice, twelve per cent. of the former and eighteen of 
the latter. The seventy per cent. of vegetable food is divided about 
as before, between pollen of Composite seven per cent., and spores 
of fungi fifty-one per cent. Lichen spores were taken more freely, 
a and were estimated at twelve per cent., eaten by all the 
beetles. 
