444 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



winged females are common in late May and early June. Their 

 bodies are somewhat smaller than those of the wingless forms, 

 and appear to be shiny black, though really a deep green. The 

 wings expand about one-sixth inch, slightly over three times the 

 length of the body. They are also carried to the roots by the 

 ants, wherever they are found, and most of them deposit their 

 young on the roots. Although these winged females aid in spread- 

 ing the pest in a bed, they probably do not migrate far unless 



FIG. 318. Strawberry root-lice which have been killed by parasites, with 

 one of the little parasitic flies which has just emerged. 



carried by the wind from a badly infested bed where they have 

 become overcrowded. Reproduction continues, one generation 

 following another about every two weeks, during the summer and 

 early fall. Part of the fourth generation is winged, but the remain- 

 ing generations are wingless. In Delaware the viviparous females 

 are common on the roots until cold weather, but doubtless further 

 south they may continue to reproduce during the winter. Late 

 in October and early in November the offspring develop into 



