Liometopum masonium (Buckley, 1866) junior synonym of current valid taxon Liometopum apiculatum Mayr, 1870
Formica masonia Buckley, 1866: 165 (w.) U.S.A. (Texas). Nearctic.
Primary type information: Primary type material: syntype workers (number not stated). Primary type locality: U.S.A.: Texas, vic. Fort Mason (S.B. Buckley). Primary type depository: unknown (no material known to exist).
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