THE PLANT LOUSE. 439 



tubercular horns, with which it pierces the plant loufe, 

 and fucks its juice. A number of its eggs placed upon 

 the leaves frequented by the lice, would foon produce a 

 number fufficient to fupprefs or deftroy them *. 



The plant loufe is a very minute infeft. Its generic 

 charafters have been thus defcribed by naturalifis: The 

 rollrum is bent inwards ; the antennas are longer than the 

 thora:5£: ; there are four ere£l wings belonging to many 

 genera, while others altogether want thefe parts j from 

 the extremity of the abdomen there projedt two horny 

 appendices ; the feet have one articulation, and are form- 

 ed for walking f . 



M. de Reaumur fuppofes that alraofl every plant has its 

 peculiar loufe, the colour varying according to that of 

 the leaves upon which they refide. Thirty-three fpecies 

 fire reckoned up by the SwediJJj naturalift. 



* Reaumur, Tome III. Memoire xi. f Syft. Nat. Ord. IL Gen. 8. 



