The Conopidae, usually known as the thick-headed flies, are a family of flies within the Brachycera suborder of Diptera. Flies of the family Conopidae are distributed worldwide except for the poles and many of the Pacific islands. About 800 species in 47 genera are described worldwide, about 70 of which are found in North America. The majority of conopids are black and yellow, or black and white, and often strikingly resemble wasps, bees, or flies of the family Syrphidae, themselves notable bee mimics. A conopid is most frequently found at flowers, feeding on nectar with its proboscis, which is often long.
The larvae of all conopids are internal parasites, most of aculeate (stinging) Hymenoptera. Adult females aggressively intercept their hosts in flight to deposit eggs. The female's abdomen is modified to form what amounts to a "can opener" to pry open the segments of the host's abdomen as the egg is inserted. The subfamily Stylogastrinae, including the genus Stylogaster, is somewhat different, in that the egg itself is shaped somewhat like a harpoon, with a rigid barbed tip, and the egg is forcibly jabbed into the host. Some species of Stylogaster are obligate associates of army ants, using the ants' raiding columns to flush out their prey. More research is needed to determine the life histories of most conopids.
Sample genera: Conops, Dalmannia, Physocephala, Stylogaster, Myopa, and Physoconops.
Further reading 
- Kröber, O. (1939). "Beiträge zur Kenntnis der Conopiden". Annals and Magazine of the Natural History (London) 11 (4): 38 1.
- Camras, S. (1962). "The Conopidae of Madagascar (Diptera)". Mémoires de l'Institut Scientifique de Madagascar. E (Tananarive) 8: 18 1.
- Smith, K. G. V. (1966). "The larva of Thecophora occidensis, with comments upon the biology of Conopidae (Diptera)". Journal of Zoology 149 (3): 263–276. doi:10.1111/j.1469-7998.1966.tb04048.x.. Keys larvae and pupae to genus (worldwide). Very full world bibliography of biology and immature stages.
Species lists 
External links 
Data related to Conopidae at Wikispecies