INSECTS COLEOPTERA DIAGRAM 6 



119 



lutely essential to their development. It makes its escape 

 when disturbed. The means of getting rid of it was 

 consequently discovered : which is to move the corn either 

 with the shovel, or by arranging the corn in the granaries in 

 such a manner that everything moves whenever a sack is 

 taken away. 



The Bostrichi have ovoid, elongated 

 bodies, their antennso are short, 

 and terminate in a club. They 

 are very small beetles, the larva) 

 of which are extremely destrue- 



Bostrichus, magnified. tive to trees. They establish 

 ^ themselves between the wood and the bark, and 



then hollow out tortuous channels, which are 

 almost always filled with the sawdust formed by 

 their work. They live thus two years, after which 

 tl icy construct a cocoon formed of sawdust fastened 

 together by filaments of silk. They pass the 

 trichus, natu- winter there in the pupa state, and it is only in 

 the following spring that they emerge from their 

 prison in the perfect state. 

 The Long i comes are a family of Coleoptera which may be 



Larva of Bos- 



Longicorn. Larva of Longicorn. 



known by their slender antennae, often recurved like a ram's 

 horns. The larvse of the longicornes also burrow long galleries 



