145 
were examined microscopically. Nearly 40 per cent, of all the 
May-beetles taken had eaten nothing. This percentage was much 
the highest for specimens taken early in the season, 62 per cent., for 
example, for those caught before June 6. Probably most of these 
empty beetles had just come from the earth and had not yet begun 
to feed. Nearly all of those captured in the fields at lights which 
had taken food had eaten the leaves of trees, as was shown by the 
presence in their intestines of small pieces of leaves exhibiting the 
netted vein-structure and other characteristics of the foliage of the 
common trees of the vicinity. Only six specimens of about six hun- 
dred dissected, had eaten the leaves of young corn. Five of these 
specimens belonged to L. riigosa and the sixth to L. inversa. Four 
additional specimens of L. rugosa were taken at Urbana directly 
from corn while feeding on it. As these ten beetles represent only 
about i}i per cent, of the whole number examined, the facts indi- 
cated by them are of little economic significance except as going to^ 
show that May-beetles, of these two species at least, emerging in 
corn fields at a distance from trees too great to enable them to find 
their more ordinary food, may nevertheless subsist on leaves of 
corn. The same facts have been shown with reference to blue-grass,, 
and it seems probable that, in the absence of other food, beetles may 
be able to live on the blue-grass of our pastures. With their actual 
powers of flight and their strong disposition to assemble in trees at 
night, not merely to feed but likewise to copulate, their ability to 
feed on grass and corn seems to signify but little. Corn, oats, wheat, 
clover, and grass fields were repeatedly examined in both Ford and 
Champaign counties with a view to the detection of any injury 
which might have been caused by these beetles. Occasionally at 
Urbana, and more frequently at Elliott, corn plants were found 
which, though uninjured in the evening, were partially eaten by the 
next morning, and, as already mentioned, four May-beetles . (L. 
rugosa) were taken directly from the plants while feeding on them. 
Dissection of these specimens showed beyond a doubt that they had 
eaten the leaves of corn. Two hundred and sixty-two specimens of 
this species were taken in 1906, 169 of them from poplar, 31 from 
elm, and 62 from other situations, and only 9 of these had eaten 
corn, as t,iiown by dissection. 
Movements oe Migration and Dispersal. 
As the larvae known as white-grubs never appear above ground 
except by accident, and as they are sluggish insects, incapable of 
rapid locomotion under ground, each is practically confined, so far as 
