Stored-Grain Pests. 13 
lay from 300 to 500 eggs each, dropping them singly or in clusters 
in the loose grain. The eggs hatch in a few days and the small 
whitish grubs crawl actively about the grain, feeding on the flour 
produced by the boring of the 
‘beetles, or boring directly into 
grains that have been slightly 
damaged. They complete 
their growth within the grain, 
transform to white pups, and 
in time change to adult beetles 
which cut their way out of the 
grain. The period from egg 
to adult in summer is said to 
be about a month. Fig. 13.—The larger grain borer: a, Adult 
insect; b, larva: c, pupa; d, antenna of 
LARGER GRAIN BORER.’ adult. Adult borer is shiny polished dark 
brown, about one-sixth of an inch long. 
a, b, c, About six times natural size; d, 
highly magnified. (Chittenden.) 
The larger grain borer is a 
small, dark brown, elongate- 
cylindrical beetle about one-sixth of an inch long. As may be seen 
in figure 13, it is very similar in appearance to the lesser grain borer, 
but may be distinguished by its larger size and comparatively smooth, 
polished surface. 
This beetle is a tropical insect not as yet widely distributed in this 
country. It is occasionally found infesting corn (fig. 14) in the 
Southern States. Its habits are similar to those 
of the lesser grain borer. It, also, has probably 
acquired its grain-feeding habits rather recently. 
GRAIN MOTHS. 
The grain moths include only those moths cap- 
able of destroying sound, unbroken grain kernels. 
Fic. 14.—Kernel of They are not so abundant as the flour moths, 
corn showing work hicl i incipally ts j br | 1: 1 
of adult of larser Which are principally pests in broken, damaged 
grain borer. The kernels or milled products. 
adult borers’ tun- 
nels in. all _direc- ANGOUMOIS GRAIN MOTH. 
tions and _ reduce 
kernels to powder : 3 : 5 
Pees Silica. The Angoumois grain moth is a small buff 
ae” (Chitten- or yellowish brown moth with a wing expanse 
of about one-half inch. This is the moth most 
commonly found in infested grain in this country and is not likely to 
be confused with any other. It attacks all cereal grains, is found in 
all parts of the world, and is particularly injurious in the South. 
where it attacks grain both in the field and in storage. 
7 Dinoderus truneatus Horn. S Sitotroga cerealella Oliv. 
