The International Union for Conservation of Nature and Natural Resources red-lists a number of ant species. One species is Anergates atratulus (Schenck, 1852), a rarely collected social parasite introduced from Europe. The known distribution in North America is along the Atlantic seaboard. This note reports a huge range expansion in North America, to include Colorado. This finding is important because it provides useful information about the conservation and dispersal patterns of a rare, introduced, socially parasitic ant species.
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Vol. 69 • No. 1