Acroceridae; small-headed fly; spider-parasite fly

Japanese: コガシラアブ（英語表記）Acroceridae; small-headed fly; spider-parasite fly

A general term for insects belonging to the Diptera family, family Pycnonotidae. A type of horsefly with a significantly bulging thorax compared to its small head. Body length is about 7-10 mm. The head is lower than the thorax, and is mostly occupied by compound eyes. The thorax is large and spherical. The abdomen is thick, spindle-shaped or spherical. The legs are thin, with paired palps at the ends of the segments, and another palp in the center. Adults gather on flowers to suck nectar. The larvae have suckers and long bristles at the tail end, and parasitize spiders and their egg capsules, feeding on them. They are common in temperate zones, and several species are found in Japan. The Oligoneura nigroaenea is 6-8 mm long, indigo-black with a brassy sheen, and is found in Hokkaido and Honshu. (→Diptera)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

双翅目コガシラアブ科に属する昆虫の総称。小さい頭部に対して，著しく膨出した胸部をもつアブ類の1つ。体長7～10mm程度。頭は胸部に対して下方につき，ほとんど複眼で占められる。胸部は大きく球形。腹部は太めで，紡錘形または球形。肢は細く，節先端には対になった褥板 (じょくばん) のほか，中央にも褥板がある。成虫は花に集り吸蜜する。幼虫は尾端に吸盤と長い剛毛をもち，クモとその卵嚢に寄生し，それらに食入る。温帯に多く，日本には数種を産する。セダカコガシラアブ Oligoneura nigroaeneaは，体長6～8mm，黒藍色で，真鍮色の光沢があり，北海道，本州に分布する。 (→双翅類 )

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