SYEPHUS FLIES. 



til 



Tlie Syrpluis flics are another important check on tlie plant-lice and 

 may be found in any field where a crop is infested. The fly is a o-raceful 



A --A ^-Ai —■></> -jSt _-><*-. .y« 





Fig. 340. 

 Grub of Syrphus Fly. {Ilagnifled five Hmes.) 



Fig. 341. 



Empty puj)"- case of Syrphvs. {Mar/vified five times.) 



Fig. 342. 

 Syrphns 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 



