49 



Fig. 33 is the grape-vine tomato gall, 

 Vitis-tomatos, Osten Sacken. This gall is 

 made by a little fly, named Lasioptera 

 Vibis, which, as well as the gall, were both 

 described by Baron Osten Sacken. 



Fig. 31. Vitis-coryloides. 



Fig. 32. Vitis-viticola. 



Another species of midge is shown at Fig. 

 34, which represents Diplosis resinicola, 

 Osten Sacken, the resin-inhabiting Dip- 

 losis. The larvae are found feeding in com- 

 panies of thirty and forty, in the pitch ex- 



4 (D) 



Fig. 33. Vitis-tomatoR. 



Fig. 34. Diplosis. 



uding from the pine tree. These are pale 

 orange, becoming brighter just before pu- 

 pating. "When about to give out the adult 

 the pupa works its way to the surface of 

 the resin, and protrudes half its body, so 

 that there is no danger of the midge be- 

 coming fastened in the sticky gum. Dried 

 lumps of resin, fairly bristling with pro- 

 truding pupa skins, are a common sight on 

 trees affected by these insects." 



