THE WEEVIL, WOLF, ETC. 139 



ten extremely small wart-like prop legs. 0) Its chrysalis state is 

 assumed in the grain, after having curiously provided a means of 

 escape by gnawing a small hole in the husk of the grain for its 

 emergence in the form of a moth. 



CATKEPlLLAE.-2Va<. Size. Magnified. 



252. The summer brood of caterpillars come to maturity in 

 about three weeks, and assume the form of the moth in autumn, 

 to propagate their kind among the stored grain. The autumn 

 brood feed upon the contents of the granary, and remain in their 

 pupa condition until the following summer, when they emerge 

 and seek the young growing crops to lay their eggs. 



253. Exposure to a temperature of 170° Fah,, for twelve 

 hours in a kiln, will destroy this insect in any one of its states ; 

 but, at the same time, it renders the grain useless as seed by de- 

 stroying the power of germination. Mr. D. J. Browne says, in 

 the Patent Office Report for 1854, that a very small quantity of 

 chloroform dropped into close vessels containing these insects, 

 destroys them in a few minutes — an artifice, however, of little 

 practical value. 



(1) See Harris' Treatise on Insects- 



FINIS. 



