117 
Genus Hippodamia. 
Eleven specimens of H. metadata, taken in Northern, Central and 
ithern Illinois at various seasons of the year, from April to Sep- 
Vber, give an average of forty-six per cent, of animal food, all 
Gets excepting a few mites eaten by three of the beetles, and 
punting to only one per cent, of the food. The insect ratio, as 
as recognized, with the exception of a single Podura, consisted 
)lly of plant-lice, which amounted to thirty-five per cent., while 
fifty-four per cent, of vegetable food contained only pollen of 
ats and spores of lichens and fungi, the pollen and spores oc- 
ring in about equal quantities. The former was chiefly from 
fers of grass and composite plants, about seven per cent, of the 
b and fifteen per cent, of the second. 
'hree specimens of this species, taken in the corn-field at Jack- 
ville, had eaten much smaller ratios of animal food, which 
Dunted to only thirteen per cent., all insects. Traces of plant- 
were recognized, but no structures of chinch-bugs occurred. All 
five per cent, of the vegetable food was derived from spores of 
gi. Three per cent, of the spores of lichens, and two per cent. 
i he pollen of rag-weed and other Compositae, complete the record. 
our examples of H. convergens, all taken at Normal in August 
September, had eaten about the same amount of animal food as 
preceding species (forty per cent.), but differed in the distribu- 
| l of it by the fact that one of the specimens had eaten a myria- 
; (Geophilus), and that a caterpillar had been taken by another. 
3cts proper amounted to but twenty-five per cent., over half 
At-lice. The vegetable food of this species stands at fifty-six per 
t., as compared with fifty-four of the preceding, and the ratios 
er this head are very similar to those just given for the other 
sies. Pollen of Compositae (dandelion) makes thirteen per cent., 
lib of grass makes five per cent., spores of lichens two, and those 
■ ungi thirty-three per cent. 
ive adults, taken at Jacksonville, were found # to have made 
ut one-third of their food of insects, equally divided between 
it-lice and chinch-bugs, each eaten by one of the beetles. The 
Station consisted, as usual, of pollen of Compositae (eleven per 
it.), spores of lichens (two per cent.), and of fungi (seventy-one 
t cent.) 
wo larvae of this species, taken at the same place and time, 
f ered but little in food, to my surprise, from the adults just 
itioned. Chinch-bugs and plant-lice in about equal ratios, with 
:es of unrecognizable insects, amount to twenty-three per cent, 
en of Compositae stands at five per cent., iiclien spores at 
Gn, and spores of fungi at sixty-five. 
f. glacialis was represented by four specimens, taken in the corn- 
1. The differences between their food and that of H. convergens 
e purely trivial. Insects amount to thirty per cent., all chinch- 
s and plant-lice, twelve per cent, of the former and eighteen of 
latter. The seventy per cent, of vegetable food is divided about 
| before, between pollen of Compositae seven per cent., and spores 
ungi fifty-one per cent. Lichen spores were taken more freely, 
ever, and were estimated at twelve per cent., eaten by all the 
lies. 
—3 
