442 



ZOOLOGY. 



are very destructive ; they are met with chiefly in warm 

 countries, but they cause considerable destruction in some 

 parts of France, as at Roehelleand at Kochefort, for example : 

 they destroy the timber of carpenters* work, and live in 

 numerous societies, composed of winged males and females, 

 of wingless neutral individuals, and of the young. 



Fig. 468. Leaf Insect (Phyllium Succifolium) . 



542. The h} 7 menoptera establish in some measure the 

 passage between masticating and sucking insects : they have 

 in front mandibles very like the first, but which do not serve 

 for mastication, and they are nourished with soft or liquid 

 matters, which they suck up by means of a moveable and 

 flexible proboscis, composed of gums and of the languette 

 extremely elongated (Fig. 436). They have, like the neu- 

 roptera, four membranous and transparent wings; but these 



