Lurking in the sunlit glades of woods and along the mountain trails and country roads, the robber-flies carry on their devastations; or in the open fields where the wild flowers make their appeal to the bees and butterflies, they chase and kill. They are very active creatures and live at the expense of other insects. They grasp them with their strong legs and claws, and then diving their beaks firmly into the bodies of their victims, they suck the blood with great voracity. Robber-flies belong to one of the largest families of the great order Diptera or two-winged flies.
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