Abstract
A new ant speciesLasius (Lasius) neglectus spec. nov. is described from Budapest, Hungary. The workers are morphologically similar toL. alienus, but queens and males are clearly different and are much smaller. The species is polygynous, without apparent colony barriers, there are probably no nuptial flights, and intra-nidal mating has been observed; in this respectL. neglectus has several features in common with the polygynous Japanese speciesL. sakagamii. Workers forage in huge masses on aphids in tress. It is argued that the rather late discovery ofL. neglectus might be due to its arfificial introduction in Budapest from a yet unknown area. The status as a distinct species is further confirmed by allozyme data (Boomsma et al., 1990, next paper).
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