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Mydas fly
The Mydidae (alternative spelling Mydaidae), or Mydas flies, are a cosmopolitan family of flies. It is a small family, with about 471 species described.〔Lyons, K. M. and T. Dikow. (2010). (Taxonomic revision of ''Ectyphus'' Gerstaecker, 1868 and ''Parectyphus'' Hesse, 1972 with a key to world Ectyphinae (Insecta, Diptera, Mydidae). ) ''ZooKeys'' 73 25-59.〕 They are generally large in size, including, in fact, the largest known fly, ''Gauromydas heros'' (syn. ''Mydas heros''). Many of the species, in addition to their large size, are mimics of stinging hymenopterans, especially wasps. Most mydids are found in arid and semiarid regions of the world,〔 but they are also found in other habitats. They are infrequently encountered as the adult lifespan can be quite short. Little is known about their biology, though Zikan reported the larvae of ''Mydas heros'' live in the subterranean detritus "pans" of ''Atta'' ants in southern Brazil, where they appear to be feeding on detritivorous Dynastidae (''Coelosis'' spp.) larvae.〔2〕 In the U.S., ''Mydas brunneus, Mydas clavatus'', and ''Mydas tibialis'' larvae are predatory on deadwood-feeding scarab beetle larvae (''Osmoderma'' spp.) and can be found in standing and downed trees with extensive heart rot. Others (e.g. ''Mydas maculiventris'') are subterranean and feed on "white grubs" (Scarabaeidae: genus ''Phyllophaga'') that attack the roots of grasses and could be potential biocontrol agents of white grubs in sod production areas. Larvae typically take 2–3 years to mature. Adults of several species are avid flower visitors and act as pollinating agents. Rattlesnake master (''Eryngium yuccifolium'') is a favorite nectar source in the Midwest.
==Description==
For terms see Morphology of Diptera.
Mydids are medium-sized to very large flies (9-60 mm in body length). The abdomen is long and cylindrical in section. It is slightly tapered apically in the male, and usually widest at segment 4 in the female. The second segment of the antenna forms a club. Mydids are sparsely pilose, and lack bristles except on the legs. The hind leg is much longer and stronger than either the middle leg or the fore leg and the hind femur is usually swollen and bears ventral spines. The hind tibia has an apical spur or bristles. The wings are long, and narrow to wide. Most of the veins end in the upper margin before the apex.
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