ON THE TWO FORMS OF THE ANT MYRMICA RUGINODIS NYLANDER (HYMENOPTERA, FORMICIDAE) FROM SAPPORO AND ITS VICINITY, JAPAN

Abstract

Based upon ecological aspects, Myrmica ruginodis Nylander from Sapporo and its vicinitv is divided into two forms, one occurring in riverside areas and the other in woodland. The riverside form is polygynous and produces fewer new queens, which suggests colony reproduction by fission and the internest movement of workers. The woodland form is generally monogynous, produces many queens, and conducts colony reproduction by solitary queens.