FLOUR MOTHS 361 
traveling about before pupation, with the result that the material in 
which it is at work is matted together and rendered valueless. In 
most situations, breeding goes on continuously. 
Remedies consist of fumigation 
with hydroeyanie acid gas. Treat- 
Fig. 570.— Larva of the Mediterra- Fig. 571.— The Mediterranean 
nean Flour Moth. Slightly enlarged. Flour Moth. Slightly enlarged. 
Original. Original. 
ment by heat is now gaining in favor, and promises to be a valuable 
method. This treatment is described under the following insect. 
The Indian-meal Moth (Plodia interpunctella Hbn.) 
Stored grains and flours of many kinds frequently become infested 
with the larve of this tiny moth, which travel here and there through 
the grain or meal, eating as they go, and always spinning quantities 
of web with which will be found mixed the castings of the worms. 
The larva is about a half inch long, 
whitish or pale pink or greenish. 
In heated warehouses breeding may 
go on throughout the vear. The adult 
is a small moth, expanding one half to 
three fourths of an inch, the fore wings 
reddish brown in their outer parts, the 
Fig. 572.— The Indian-meal 
Moth. Larva. Slightly en- 
i ings gray eh 
hind wings gray. larecd. Orfeinall 
In elevators or warehouses that are 
heated by steam the pest may be treated successfully by heat. If 
the temperature throughout the building can be raised to 120 degrees 
Fahrenheit, and maintained at that point for 6 hours, practically all 
