File:Tetramorium tsushimae, St. Louis, Missouri, James Trager.jpg

This is Tetramorium tsushimae, Japanese pavement ant, feeding on mooshy cracker fragment, in a play area, in a suburb of St. Louis, Missouri. Light colored individuals among the dark ones are typical of this species, which is a bit smaller than Tetramorium caespitum (sp. E), (2.5-2.8 mm vs. 2.9-3.2 mm). Colonies are polygyne, polycalic. The species is native to Japan, the Korean Peninsula, and temperate China. USA population originated in Tokyo area, so says its DNA. James Trager.