426 



BOARD OF AGRICULTURE. 



middle of the pronotum is called the median carina. The form 

 and structure of this piece are of great importance in classifica- 

 tion. 



The mesothorax, or middle thorax, has the second pair of legs 

 attached to its under side, and the first pair of wings, or fore wings, 



XaSaxum {jUXj' 



^a.xs\ji^ 







^? / 



Fig. 2. 



attached to its upper side. These fore wings are of a denser text- 

 ure than the hind wings, and are often called wing covers^ elytra 

 or tegmina. 



The metathorax has the hind legs attached to its under side, and 

 the hind wings, or true organs of flight, attached to its upper side. 



