Senburi (Senburi, Mud Dragonfly) - Senburi (English spelling) alderfly

Japanese: センブリ(千振∥泥蜻蛉) - センブリ（英語表記）alderfly

A general term for insects belonging to the family Sialidae in the order Neuroptera, or one of these. These insects are medium-sized, with a wingspan of 20-40 mm, and are generally black-brown or black in color. They are widely distributed around the world except in the polar regions, but this small family has only 40 recorded species. In Japan, 11 species are known. Adults fly around waterside areas during the day. They appear in the grass around ponds and slow-flowing water in mountainous areas from April to July, and are said to have a short lifespan of just a few days. The eggs are tiny, elongated, cylindrical, and are laid in masses of 200-500 eggs on aquatic plants or rocks near the water's edge.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

脈翅目センブリ科Sialidaeに属する昆虫の総称，またはそのうちの1種を指す。この仲間は中型で翅の開張20～40mm，全体に黒褐色ないし黒色を帯びる。極地を除き世界中に広く分布するが，小さな科で40種足らずが記録されているにすぎない。日本では11種が知られる。成虫は昼間水辺付近を飛翔（ひしよう）する。4～7月，山地の池沼や緩い流れの水辺の草むらに発生し，寿命は短く数日であるという。卵は微小で細長い円筒形，水草や水ぎわの岩石などに200～500粒の卵塊で産みつけられる。

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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