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The Therevidae are a family of flies of the superfamily Asiloidea commonly known as stiletto flies. The family contains about 1,600 described species worldwide, most diverse in arid and semiarid regions with sandy soils. The larvae are predators of insect larvae in soil.〔German Wikipedia: Luchsfliegen〕 ==Description== Adults are small or medium-sized with a body length of 2.4 to 18 mm. The abdomen is long and slender and the integument is hairy. The cuticle can have colors ranging from black to yellow, but often the background colour is masked by the tomentum. The head is large, generally holoptic in males, dichoptic in females, and has three ocelli . The antennae are relatively short, with the scape and pedicel pubescent; the scape has an elongated shape, the pedicel is very short and the first flagellomere is elongated conical, the apex bearing a compound stylus with one to three segments. The mouthparts type is sucking-the labium ending in two fleshy labella. The thorax is broad and moderately convex, with long bristles (macrotrichae). The legs are long and slender, with femora and tibiae bearing bristles; the tibiae are without apical spurs and the tarsi are provided with empodia or without the median pretarsal. The wings are well developed, hyaline or opaque, often with pigmentation of the veins located at the termination of the transverse and longitudinal veins. The abdomen is elongated, consisting of eight apparent uriti. It is tapered posteriorly and convex or flattened dorsally. The abdominal end of females is generally provided with spinous processes. The wing venation is relatively complex but without a particular conformation to distinguish the Therevidae from other families of Asiloidei. The radius is divided into four branches, with R 2 +3 undivided. The branch R 4 is long and winding and reaches the costal margin, the branch R 5 terminates on the posterior border, so the second submarginal cell is open at the apex of the wing. The media is divided into four branches, all independent but with M 3 and M 4 convergent. The transverse medial vein closes the discal cell. This has an elongated shape and terminates at the apex with three angles from which the first three branches of media spring. The fourth branch, M 4 (or CuA 1 according to a different interpretation), originates from the apex of the posterior basal discal cell. The cubit and anal converge on a short common branch before reaching the apex. The larva is apodous and eucepalic, cylindrical, very long and thin, and with tapered ends. The integument is smooth, white, or pink. The head capsule is well developed, but narrower than the other regions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Therevidae」の詳細全文を読む スポンサード リンク
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