THICK-HEADED FLY

an elongated, wasplike insect of the family Conopidae (order Diptera). It is brownish in colour, often with yellow markings, and between about 6 and 25 millimetres (0.2 and 1 inch) long; the head is thicker than the thorax. In some species the long and slender proboscis (feeding organ) is bent. Eggs are deposited on or in host insects (e.g., adult wasps, bumble bees, grasshoppers), and the larvae are parasitic.