Taxonomic revision of the species group (Hymenoptera, Formicidae) from Madagascar.

The present study represents a taxonomic revision of the species group from Madagascar. Forty-four members of this group are recognised and described, and an illustrated identification key to this group is also presented. One species is raised to species level: Forel, 1892 Forel, 1892 is proposed as a junior synonym of Forel, 1891. Worker castes are also described and lectotypes designated for Forel, 1892, Forel, 1891, and Forel, 1891. The following 41 new species are described: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , and At present, there are 109 valid species and subspecies of known from Madagascar, but this number is expected to increase with upcoming taxonomic revisions of the species groups not revised in this study.