Crematogaster osakensis

Japanese Name

Kiiro-shiriage-ari

Forel, A. (1900) Fourmis du Japon. Nids en toile. Strongylognathus huberi et voisins. Fourmili?re triple. Cyphomyrmex wheeleri. Fourmis import?es. Mittheilungen der Schweizerischen Entomologischen Gesellschaft 10: 267-287.

Crematogaster sordidula var. osakensis Forel, 1900, Crematogaster sordidula subsp. osakensis: Emery, 1912, Crematogaster sordidula var. japonica Forel, 1912, Crematogaster osakensis: Collingwood, 1976,

Total length of workers around 2 - 3 mm or slightly more. Body color yellow, dorsum of head and posterior half of gastral tergites a little darker. Antennal club 2-segmented. Antennal scape slightly surpassing the posterior border of head. Promesonotal suture indistinct, the dorsum in lateral view forming a curve. Pronotal pleuron and mesonotal dorsum smooth. Mesonotal pleuron punctured and rough. Metanotal groove distinctly impressed, but obstructed by a lamella at the lateral border of its dorsum. Propodeal spines slender and rather long, acutely pointed; raised at an angle of less than 45 degrees in lateral view. Subpetiolar process small, projecting anteriorly. Petiolar sides in dorsal view slightly narrowed posteriorly, and with a pair of hairs, each about as long as the petiole. Postpetiolar dorsum without a median furrow.

This species nests under stones and in the soil of grasslands or forests. Colonies are polygynous. Reproductive alates fly at evening in September and are attracted to light.

Hokkaido (Sapporo), Honshu, Shikoku, Tsushima I., Kyushu, Yaku I., Tanegashima I., Nakanoshima I., Amami-oshima I.; Mainland China, Korean Peninsula.