Formica yessensis

Japanese: エゾアカヤマアリ（英語表記）Formica yessensis

An insect of the Formicidae family of the Hymenoptera order (illustration). Worker ants are 5-8 mm long and mostly yellow-red except for their dark brown abdomen. They inhabit the mountains from Hokkaido to central Honshu, and are also distributed in eastern Siberia, northeastern China, and the Korean Peninsula. In central Honshu, they live in larch forests at altitudes of about 1,400-1,800 m. They build their nests underground, but on top of that they pile up small pieces of dead plants to build cone-shaped mounds about 50 cm high, in which they raise their larvae in the summer. Usually, one family lives in one mound, but sometimes they move freely between several mounds, making the whole family look like one. This is called a super colony.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

膜翅目アリ科の昆虫（イラスト）。働きアリの体長は5～8mm，黒褐色の腹部を除きほぼ黄赤色。北海道から本州中部の山地にまで生息し，シベリア東部，中国東北部，朝鮮半島などにも分布する。本州の中部では標高1400～1800mくらいのカラマツ林にすみ，巣は地中につくられるが，その上に枯れた植物の小片を積み上げて高さ50cmほどの円錐形の塚をつくり，夏にその中で幼虫を育てる。ふつうは1家族で一つの塚にすむが，いくつかの塚の間を自由に往来して全体が一つの家族のように見える場合があり，これをスーパーコロニーsuper colonyという。

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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