614 
M. R. TRUMBOWER. 
land, Jasper, Effingham, Cumberland, Montgomery, Macou¬ 
pin, Scott, Morgan, Sangamon, Christian, Pike, Brown, Cass 
and Henderson.” 
Extract from Bulletin No. 5, Nov. 26, 1894: 
“ The white muscardine will not spread among vigorous 
chinch bugs in the field in very dry weather to an extent to 
give the disease any practical value as a means of promptly 
arresting any serious chinch bug injury under such condi¬ 
tions. It may be added that chinch bugs are usually vigor¬ 
ous in dry weather. 
“ It is most likely to ‘ catch ’ in low spots where the soil is 
kept somewhat moist by dense vegetation, a mat of fallen 
herbage, or the like. Shocks of corn, especially when the 
crop is cut early, furnish excellent places for the development 
of this disease. 
“ If decidedly wet weather follows upon its introduction, 
even after an interval of several weeks, it is likely to start up 
and take visible effect; but continuous rains, depressing the 
vital energies of the insect, are commonly requisite to its ef¬ 
ficient action. 
“It is always so generally prevalent, in a more or less 
latent state, among the chinch bugs of Illinois, both north and 
south, that it is very likely to appear and spread, as if spon¬ 
taneously, whenever conditions favorable to its development 
long prevail, whether it has been purposely introduced or not. 
“ The time elapsing between the establishment of such 
favorable conditions and the full development of the disease 
among the chinch bugs of any locality, may possibly be 
shortened if the infection has previously been introduced by 
artificial means. 
“ Whatever weakens the insect favors its spread, as a rule. 
It is, consequently, much more likely to attack adults than 
young, especially spent males, and females which have laid 
their eggs, and which are soon to die of old age ; but it never¬ 
theless often kills them at all ages. In agreement with the 
above we have noticed that the fall generation of adults is 
less subject to it, other things being equal, than the genera¬ 
tion which matures in midsummer. As this fall brood is to 
