Diptera (2)
Brachycera (6)
Nematocera (7)
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Wings usually broken off, leaving a short stub; if wing complete, crossvein dm-cu absent. Female with abdominal sternites 1-5 absent; membrane with numerous setiferous sclerotized spots. Consists of 5 species.
Mainly Nearctic Region, but occurs also in the Palaearctic and Oriental Regions.
The larvae develop in various kinds of bird's nests, adults loose their wings and live hemiparasitic on the nestlings.