30 
way as effective for the destruction of chinch bugs as that ob- 
tained from the insects themselves, I hada large quantity 
grown artificially on this material, and used this also for distri- 
bution. 
By these methods I succeeded, by about the 2oth of July, in 
supplying all who had sent requests up to the ioth of that 
month—a little over two thousand for the season. As I had 
issued a second bulletin June 30, giving notice that it would be 
impossible to continue the distribution beyond July 10, I con- 
sidered the obligations I had assumed thus fulfilled, and the 
work was brought practically to an end. 
Each lot of chinch bugs, living and dead, was accompanied 
by the following circular of directions for their utilization and 
of caution against hasty observation and inference: 
‘* STATE OF ILLINOIS.—OFFICE OF THE STATE ENTOMOLOGIST.”’ 
CHAMPAIGN, June 20, 1894. 
‘Dear Sir: I send you by this mail chinch bugs which have 
been successfully exposed to the white fungus disease of that 
insect, and are in a condition to convey it to others. 
‘‘To propagate this disease in your field, make a tight shal- 
low wooden box, Say, 24x36x6 inches, and place in it a layer of 
dirt half an inch deep, free from leaves or other rubbish. 
Moisten this dirt without making it muddy, and then put in a 
thin layer of green wheat or corn. Scatter the dead chinch bugs 
sent you over the bottom of the box, and shut up with them a 
quantity of live bugs from the field——as many as can well move 
about in the box without being anywhere more than one layer 
deep. Fasten the cover down tight, so that nothing can escape, 
and set the box where it will be protected from sun and wind. 
A cellar or a basement room is to be preferred. 
‘‘Open the box daily and moisten its sides and contents (with- 
out making them muddy) when they begin to get dry, and also 
change the food as that in the box becomes yellow. When it is 
seen that the white, mouldy bugs are becoming more numerous, 
probably in about three or four days, take a part of the bugs, 
dead and alive, out of the box, putting in fresh live ones to take 
their places, and close the box as before. 
‘‘Those taken out should then be scattered through the in- 
fested field where the bugs are thickest—at the bases of the 
