affecting the Corn- Crops. 
109 
The caterpillar of a full-bodied moth feeding on the corn in a 
barn. 
They disliked the light, and buried themselves amongst the 
corn. 
They spun fine but slight cocoons, attaching grains and chafF out- 
side, previous to becoming chrysalides. 
, Numerous grain-feeding insects imported with corn. 
Cleanliness in granaries an important object in checking their 
ravages. 
Noxious insects much more abundant in the south of France, 
Italy, &c., owing to the high temperature. 
This has led to the cultivation of Entomology generally abroad. 
Laws passed for the destruction of insects, and distinguished 
men engaged by the Governments to investigate the causes of the 
failure of crops. 
Our cold climate destroys many imported insects ; whilst others, 
more hardy, become naturalized. 
Insects appear to progress from the south-east to the west or 
north, and often disappear suddenly. 
The little corn-moth, Butalis cerealella, commits dreadful ra- 
vages in France, entailingyam/He and epidemics. 
It is gradually spreading itself in central France, and seems to 
have reached the United States. 
The infested corn loses 40 per cent, in weight, and 75 per cent. 
of flour. 
The caterpillars live in the grain of wheat, barley, oats, and 
maize. 
The moth deposits 20 or 30 eggs upon the grain in the field as 
well as in the granary. 
They hatch in 6 or 7 days, sometimes in 4 days. 
The little caterpillar eats into the grain, only one occupying 
each kernel. 
When the flour is all consumed it changes to a pupa inside the 
husk, which it lines with a silken weh. 
The grains at this time appear perfectly sound to the eye, but 
are soft to the touch. 
They seem to devour their own excrement once or twice. 
The end of November there are many caterpillars in the grain, 
in the spring mostly pupce. 
Some of the eggs hatch much earlier than others. 
The moths appear the beginning of May or in June, and again 
in November. 
They make their way out of the grain through a little hole cut 
by the caterpillar, and live only 2 or 3 weeks. 
A parasitic Jly, amounting to 20, is sometimes hatched from 
one pupa. 
