

It 



1'hLn.ciD Drone-Fly. 



In the upper photogrnph tlic dirk-coloured spiiiv grubs are seen crawling over a piece of wasp-comb and cleaning out the cells by feeding upon 

 waste matter loft in them by the wasp-grubs. The lower pliotograph shows the perfect Insect, possibly egg-laying. In both cases the Insects 

 are shown of tlie natural size. The wasps, though very destructive to tiies in general, take no notice of these, recognizing them as useful allies. 



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