^^-4 



Bee-like Drone-fly. 



Plate 33 



Girdled Drone-fly. 



Page 248 



These Hies, which have a superficial resemblance to Ijccs aud wasps, were held 



fornn;rl5' to be parasites upon their liosts ; but tliey are now linown to be beneficent 



scavengers, helping to keep tlic nest clean. 



Photos by Author, 



