80 
The following table shows the dates at which the lice have been 1 
observed. It is deficient in not showing the relative abundance at 
the different dates of the stages, larva, pupa, and adult females: 
Date. 
Root Form. 
• 
Aekial, Fokm. 
Larva.... 
Pupa. 
Winged 
female.. 
Wingless 
female.. 
Larva.... 
Pupa. 
[ 
Winged 
female.. 
® - 
h 
«S 
: a 
TVTsiv Hi __._... 
X 
X 
X 
44 22 . 
X 
.Turn a 1 . . . 
X 
“ « . 
X 
X 
X 
X 
“ 7 . 
X 
“ 13 . 
X 
“ 95 . 
X 
X 
X 
“ 99 .:... 
X 
.Till v 3 .. 
X 
• • fi . 
X 
“ 21 
X 
“ 25 . 
X 
X 
X 
X 
X 
X 
“98 ... . 
X 
“ 29 . 
X 
X 
• * 31 . 
X 
X 
A wss 2 _ .._.. 
X 
X 
X 
X 
“ 11 . 
X 
X 
X 
X 
“ 20 . 
X 
X 
X 
“ 28 . 
X 
X 
X 
fipnt. 4 ...._ 
X 
X 
X 
“ 5 .. 
X 
X 
X 
X 
‘ ‘ 6 
X 
4 4 8 
X 
4 4 18 
X 
X 
4 4 19 
X 
44 22 . 
X 
4 4 25 
X 
X 
Opt 2 
X 
X 
X 
4 4 6 . 
X 
X 
X 
X 
4 4 7 .. . 
• 
X 
X 
X 
X 
4 4 8 
X 
X 
4 4 9 
X 
X 
X 
<. Y! 
- 
X 
X 
“ 25 . . 
X 
X 
X 
X 
4 4 30 
X 
X 
X 
X 
Nov 1 
X 
X 
X 
44 8 
• 
X 
X 
X 
4 4 9 
X 
X 
X 
4 4 15 
X 
X 
The species will probably be found to occur in every county of the 
State. We have observed it or had it reported from the following: 
Stephenson, Ogle, DeKalb, Rock Island, Kendall, LaSalle, Putnam, 
Stark, Livingston, Warren, Peoria, McLean, Tazewell, Mason, Me¬ 
nard, Champaign, Morgan, Jersey, Fayette, Effingham, Marion, 
White, Madison, Union, and Pulaski. 
PARASITES AND PREDACEOUS INSECTS AFFECTING THE CORN LOUSE. 
A most efficient check on the further increase of the corn louse 
exists in a small four-winged fly, belonging to the genus Adialytus, 
which deposits its eggs within the bodies of the lice and in its 
larva state feeds upon their tissues. The greater part of a colony 
of the lice is sometimes thus infested, the lice containing the grubs 
which hatch from the eggs being known by their brown swollen 
bodies, or at an earlier stage by a slightly yellowish color. 11^ 
adult Adialytus is a slender, active ichneumon fly, about .06 inc 
in length. Its feelers and legs are long and slender and the abdo¬ 
men is very flexible so that it can easily be bent upon itself. 1 ie 
