4 Farmers’ Bulletin 1260. 
cate a condition likely to affect the trade, provided that after the grain 
has reached the elevator it is screened and fanned to remove these 
insects. 
The writers have divided the insects discussed in this bulletin into 
grain weevils, grain borers, grain moths, flour moths, mealworms, 
grain and flour beetles, psocids, and mites. In some respects this is 
not a satisfactory grouping, especially for the insects listed as “ grain 
and flour beetles,” but it has the advantage of definitely placing the 
most serious insects troublesome in bulk grain. 
lic. 1.—Life stages of the granary weevil in wheat: a, Well-grown larva; b, pupa; ¢, 
adult. Note hole in kernel made by the adult in order to leave the seed, and hole 
that it is eating into the kernel for the purpose of laying eggs. This weevil closely 
resembles the rice weevil but has no papery wings beneath its wing covers, and the 
dot-like punctures on the back behind its head are elongate rather than round. 
GRAIN WEEVILS. 
Of the four true weevils that attack grain in the United States only 
two are of primary importance at present, the granary weevil and the 
rice or black weevil. The broad-nosed grain weevil and the coffee- 
bean weevil are of minor importance except locally. These four 
weevils have an elongated beak or snout, as shown in the illustrations, 
though the beak of the coffee-bean weevil is greatly reduced. 
GRANARY WEEVIL.' 
The granary weevil (fig. 1) is a small, moderately polished, chestnut 
brown or blackish beetle with head prolonged into a long slender 
snout at the end of which are a pair of stout mandibles or jaws. It is 
1 Sitophilus granarius 1%. 
