INSECT PESTS 161 



the aphid and by sucking out its con- 

 tent. When the maggot is full grown 

 it seeks some sheltered spot where it 

 pupates and becomes transformed into the 

 adult fly. The adults are dark, with 

 transverse yellow bands across the abdo- 

 men (fig. 34 a and b). They are swift 

 fliers and are often mistaken for bees. 

 They feed on the nectar of flowers and be- 

 cause of this habit are often called Flower 

 or Honey Flies. On hot days they are 

 very numerous and are called Sweat Flies. 

 They lay their eggs on vines attacked by 

 the aphids. 



Green Lace Wing. Chrysopa calif ar- 

 nica. This insect is called Aphis Lion be- 

 cause of its destructiveness to all green 

 plant lice. The larvae of these beneficial 

 flies are provided with two long curved 

 mandibles upon which the aphids are held 

 prisoners until they are sucked dry. They 



