I managed to grab a couple of images of this rather unusual beefly, feeding on wild thyme in the meadow. Xenox tigrinus is more commonly known as the tiger bee fly. Tiger bee flies hunt for carpenter bees. When a female tiger bee fly locates a carpenter bee nest she lays eggs at the entrance. The eggs hatch into larvae that find the carpenter bees within. Tiger bee fly larvae usually wait until their prey is in the helpless pupal state, and then they eat it.