58 



ARTHROPODA 



not true flies are easily 

 learned from observing 

 the common currant 

 worm ( Nematus ri- 

 besii). The minute 

 elongate eggs are de- 

 posited on the under 

 sides of the currant 

 leaves and gooseberry 

 leaves in May and June 

 where they hatch into 

 yellowish green cater- 

 pillarlike larvae attaining their full size of an inch in about 

 two weeks. They then drop to the ground, and just be- 



PlG. 40. Photograph of currant sawfly, and co- 

 coon dug from the ground. Twice natural size. 



FIG. 41. Photograph of a leaf of currant with eggs of the sawfly in their charac 

 teristic location along the veins. Twice natural size. 



neath the surface form cocoons from particles of earth 

 within which they transform to pupae and a few days later 



