SYRPilUS 



The Syrphus flies are another important check on the plant-lice and 

 may be found in any field where a crop is infested. The fly is a graceful 



FIG. 340. 



Grub of Syrphus Fly. (Magnified five times.} 



FIG. 341. 

 Empty pupa case of Syrphus. (Magnified five times.) 



FIG. 342. 

 Syrptius Fly . (Magnified five times.) 



two-winged fly, coloured in black and yellow, which " hovers " in a 

 very noticeable manner, remaining motionless on the wing suspended in 



