Small leaf beetle (English name: Gastrophysa atrocyanea)

Japanese: コガタルリハムシ（英語表記）Gastrophysa atrocyanea

An insect of the family Chrysomelidae in the order Coleoptera. It is distributed from Hokkaido to Kyushu, the Korean Peninsula, China, Indochina, the Amur region, and Siberia. However, its habitat in Japan is thought to be localized. Both larvae and adults feed on docks and knotweeds, but since it particularly prefers docks, it is also called the dock leaf beetle. The back of the adult is shiny blue-blue. The dots on the elytra form a row in some places. The outer corners of the tibiae of the middle and hind legs protrude into a triangular shape and become sharp. Body length is about 5.5 mm. Adults appear from late March and lay eggs on the undersides of dock leaves.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

甲虫目ハムシ科の昆虫。北海道から九州，朝鮮半島，中国，インドシナ，アムール地方，シベリアなどに分布する。しかし日本における生息地は局地的と考えられる。幼虫，成虫ともギシギシ類，タデ類を食べるが，とくにギシギシ類を好むところからギシギシハムシとも呼ばれる。成虫の背面は青藍色で光沢がある。上翅の点刻は一部で列状をなす。中･後脚の脛節（けいせつ）外端角は三角形に突出しとがる。体長約5.5mm。成虫は3月下旬ごろから出現し，ギシギシ類の葉の裏面に卵をかためて産みつける。

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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