152 
posterior femora dusky; tibiae fuscous; tarsi rather lighter colored, 
last joint dark; base of abdomen fuscous; wing veins light brown, 
stigmal vein half as long as marginal, and less than one-fourth as 
long as sub-marginal. 
The female is longer (2.5, to 3 mm) and more robust. The abdomen 
is more acutely triangular, and not fuscous at base; the ovipositor, 
which is concealed when not m use, is reddisli-brown, and is passed 
back and forward along a ventral, median, groove; club of anten¬ 
nae darker. The femora are darker, and the spine, near apex of 
middle femora, is stouter and longer than in the male. 
Described from specimens bred from larva of Crelecliici ccTecilcllo., 
The species occurred in considerable numbers, and I found often 
eight to ten pupae about a single larva. Afterwards the. adult insects 
were found crawling about among the grains, taking wing whenever 
an opportunity was afforded for escape. 
They probably contribute considerably toward keeping the pest in 
check, although I found them infesting only about three per cent, 
of the larvae. 
ARTIFICIAL REMEDIES. 
As may be supposed, an insect passing so large a portion of its 
period of existence in such seclusion, is an exceedingly difficult one 
to reach with even palliative measures. 
The principal part of the life-time of the. larva is passed in the 
grain, with only the minute hole, by which it first entered, to admit 
either fumes of various herbs, or gases, powdered lime, or other sub¬ 
stances. 
Even this small avenue is cut off as soon as the worm spins its 
cocoon; hence it is scarcely to be wondered at that applications of 
this character are productive of unsatisfactory results. 
Heat, However, passes through all these obstructions and penetrates 
the innermost recesses of the grain. Careful experiments, which I 
made this winter, have proven that a temperature of 140° Fah. con¬ 
tinued for nine hours, literally cooks the larva or pupa; that a tem¬ 
perature of 130° Fah., for five hours, is fatal, as is also 12(F Fah., 
kept up for four hours, while 110° Fah., applied for six hours was 
only partially effective. Dr. Harris states, in “Injurious Insects,” p. 
507, that a heat of 104° Fah., will be found effective if kept up for 
several days. 
In order to ascertain the amount of heat which wheat could with¬ 
stand without destroying its germinating qualities, 195 grains were 
kept at a temperature of about 150° Fah. for eight hours. Of these, 
twenty-two (or eleven per cent.) failed to grow; while of 312 not 
baked, thirty-four failed to grow, (about ten per cent.), showing that 
this degree of heat may be used without damage. 
Curtis, in “Farm Insects,” states that 190° Fah. may be used; 
but wheat which I kept a few hours at a temperature of 180° Fah. 
failed to germinate. 
