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 deitroy them *. 
The plant loufe is a very minute infect. Its generic 
charaders have been thus deferibed by naturalifls : The 
roftrum is bent inwards ; the antenna: are longer than the 
thorax ; there are four erect wings belonging to many 
genera, while others altogether want thefe parts ; from 
the extremity of the abdomen there projed two horny 
appendices ; the feet have one articulation, and are form- 
ed for walking f . 
M. de Reaumur fuppofes that almoft every plant has its 
peculiar loule, the colour varying according to that of 
the leaves upon which they relide. Thirty-three fpecies 
are reckoned up by the Swedc/h naturalift. 
* Reaumur, Tome III. Memoircxi. 
f Syft.Nat. Ord. II. Gen. S 
