Mizubee (water bee) - Mizubee (English spelling) Agriotypus gracilis

Japanese: ミズバチ(水蜂) - ミズバチ（英語表記）Agriotypus gracilis

An insect of the Hymenoptera family, Ichneumonidae. Body length 6-7 mm. It is black-brown in color, covered with thick short hairs all over its body, and has a spine that protrudes backwards from the center of the back of its thorax. It is known from Hokkaido and Honshu, and is often collected from the banks of lakes and streams. It parasitizes the larvae of aquatic caddisflies. Adult females fold their wings and enter the water, penetrating the nests of caddisfly larvae that are attached to stones on the bottom of the water, and lay eggs there. The hatched larvae feed on the caddisfly larvae and grow, spin cocoons in the nests, and pupate.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

膜翅目ヒメバチ科の昆虫。体長6～7mm。黒褐色で全身があつい短毛でおおわれ，胸部の背面中央に後に向かって突出するとげがある。北海道，本州から知られており，湖沼や渓流のあぜでしばしば採集される。水生のトビケラ類の幼虫に寄生する。雌の成虫は，翅をたたんで水中に入り，水底の石面などに付着しているトビケラ幼虫の巣内に侵入し，これに産卵する。孵化（ふか）した幼虫はトビケラの幼虫を食べて成長し，その巣内で繭をつむぎ，蛹化（ようか）する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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