Crematogaster flachii Forel, 1895 junior synonym of current valid taxon Crematogaster sordidula (Nylander, 1849)
Crematogaster sordidula var. flachii Forel, 1895e: 229 (w.) SERBIA. Palearctic.
Primary type information: Primary type material: syntype workers (number not stated). Primary type locality: Serbia: Belgrade (Flach). Primary type depository: MHNG. Type notes: Forel, 1895e says the taxon had already been found on Crete by von Oertzen, and by himself, but it is uncertain whether this material constitutes part of the type-series.
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