184 NORTH AMERICAN INSECTS. 
The Grain-worm ; or, White Corn-worm (Tinea cerealella). 
This is another very injurious insect, also originally an 
emigrant from the Old World. 
Grain is devoured, as is well known, by different species 
of larve, some of which are metamorphosed into snout- 
beetles, as the Rice-weevil, or Black Corn-worm (Calandra 
granaria); others into flies, as the Hessian-fly (Cecidomyia 
destructor), or the wheat-fly (Cecidomyia tritici). These, of 
course, can only be mentioned incidentally here, as we are 
treating of moths, and must continue the natural history 
of the Grain-moth. 
The female of this species is very active in the months 
of May and June, when she comes out of neglected gran- 
aries ; and, flying about with her male attendant at night, 
she deposits her eggs upon the grains of wheat, barley, rye, 
and oats. From these eggs, in a short time, proceed dimin- — 
utive, yellowish-white, naked caterpillars, with a brown 
head, which immediately commence their devastations 
among the grain. With a silky thread they fasten together 
several grains, and between them make numerous holes or 
passages in which they can securely reside. By so doing 
the little animal has built for itself a very comfortable, and 
even substantial dwelling; for if it should roll down the 
grain-heap or be tossed about in a cart, its body is still in- 
closed in a soft fold of silk, and would not suffer at all. 
Here they feed upon the mealy substance of the grain for 
about three weeks, when they arrive at maturity, at which 
period they are about the fifth part of an inch long. Then, 
changing into a chrysalis within the empty grain, they are 
soon transformed into small, winged moths of a cinnamon- 
brown color. Two successive generations of this insect are 
developed every year. 
Lhe French naturalist, M. Bosc, who spent several years 
in the United States, in 1796 found this moth so abundant 
