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This is a small subfamily characterized by the presence of a blunt process on the right maxillary stylet; the pedicellus with membranous rings inserted between sclerotized areas; the hind wing with a broad postcubital sector; hook-shaped parameres; endosomal struts absent; genital sclerites hidden between sternite 7 and tergite 8; proximal portion of the lateral spermathecal duct has a very elaborate and thick wall; they also show a bifid scutellar posterior process (Weirauch, 2008).