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Acroceridae
Acroceridae are a small family of odd-looking flies. They have a humpbacked appearance with a strikingly small head, generally with a long proboscis for accessing nectar. They are rare and not widely known outside entomological circles. The most frequently applied common names are small-headed flies or hunchback-flies. Many are bee or wasp mimics. Because they are parasitoids of spiders, they also are known as spider flies
==Description==
The Acroceridae vary in size from small to fairly large, about the size of large bees, with a wingspan of over 25 mm in some species. As a rule both sexes have tiny heads and a characteristic humpbacked appearance because of the large, rounded thorax. Accordingly Acroceridae are commonly known as hunchback-flies or small-headed flies..〔Gillung, Jéssica P, Winterton, Shaun L. New genera of philopotine spider flies (Diptera, Acroceridae) with a key to living and fossil genera. Journal Article: ZooKeys 01/2011; 〕
In appearance they are compact flies without major bristles, but most species have a bee-like furriness on their bodies. In most species the eyes are holoptic in both sexes, the heads seemingly composed mainly of the large faceted eyes. This is in contrast to many insects in which the males have larger (even holoptic) eyes, whereas the females have normal or even vestigial eyes. The squamae are disproportionately large, completely covering the halteres and the abdomen has an inflated appearance, often practically globular. The thorax is large and highly raised. The tarsi are equipped with large claws with three pulvini below them.
Many are bee or wasp mimics.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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