MAINE AGRICULTURAL, EXPERIMENT STATION. IQIO. 3// 



Insectivorous Insects. — There are very many carnivorous 

 kinds which devour insects entire. Such are the ground-beetles 

 (fig. 51), water-beetles, the larvae of Tenebrionids and of lady- 

 beetles (Coccinella) (figs. 52, 53), and those of the lace-winged 

 flies (Chrysopa) which prey on Aphids, though the maggots 

 of the Syrphus flies are more abundant and efficacious as Aphis- 

 destroyers. 



Practical Application. — When the life of an injurious insect 

 is carefully studied, it is frequently found that the pest can be 

 combated by breeding and distributing its natural parasitic and 

 predaceous enemies. For a most remarkable example of such 

 an undertaking, it is only necessary to mention the work of the 

 U. S. Government and Massachusetts against the Gypsy Moth. 

 For current accounts of this work the reader is referred to the 

 Annual Reports of the Mass. State Forester, and publications 

 of the U. S. Bureau of Entomology. 



