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A new species of the ponerine ant genus <em>Myopias</em> Roger, 1861 collected from southwestern China is described based on morphological features. <em>M. daia</em> sp. nov. is allied to <em>M. luoba</em> Xu &amp; Liu, 2012, but differs from the latter by the shape of the posterior head margin, eye facet number, petiolar node shape, head sculpture, body color, and total length. The new species is also allied to<em> M. nops</em> Willey &amp; Brown, 1983 and <em>M. menba</em> Xu &amp; Liu, 2012, but differs from the latter two species by petiolar node shape, eye facet number, and body sculpture and color. A key based on the worker caste is provided to the eleven known Oriental species of the genus for the first time.