Rice leaf beetle (English name: Oulema oryzae)

Japanese: イネクビホソハムシ（英語表記）Oulema oryzae

An insect of the family Chrysomelidae (illustration) in the order Coleoptera. The thorax is yellow-red except for the front and back. The forewings are shiny blue-blue. Body length is 4-5 mm. Both adults and larvae are known to feed on rice leaves, but they also feed on a wide range of plants in the Gramineae family, including reeds, orchard grass, and Imperata cylindrica. They inhabit mainly cold regions from Hokkaido to Kyushu, and also cause damage in the Korean Peninsula and mainland China. They are found in highlands in Taiwan. The larvae are gray-white in color and have a strongly raised abdomen. They are also called rice leaf beetles because they always have their own excrement on their backs, making them look like they are carrying mud on their backs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

甲虫目ハムシ科の昆虫（イラスト）。胸部は前後を除いて黄赤色。上翅は青藍色で光沢がある。体長4～5mm。成虫，幼虫ともイネの葉を食害することで知られるが，ヨシ，カモガヤ，チガヤなどイネ科の植物を広く食する。北海道から九州までの主として寒冷地に生息し，朝鮮半島，中国大陸においても被害がある。台湾では高地に分布する。幼虫は灰白色で腹部が強く隆起する。つねに自分の糞を背中にのせていて，一見，泥を背負っているように見えるところからイネドロオイムシとも呼ばれる。

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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