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The fairyfly Mymaridae (Hymenoptera: Chalcidoidea) are widely distributed worldwide, but species of this family have rarely been collected and recorded from the Qinghai–Tibet Plateau. In this study, mymarids collected in Tibet, China, are identified based on morphology and molecular data. Two species of the genus <i>Pseudanaphes</i> Noyes & Valentine are treated and illustrated here, including a known species, <i>P. zhaoi</i> Lin, and a new species, <i>P. yadongicus</i> Aishan & Cao sp. nov. In addition, a key to the world species of <i>Pseudanaphes</i> (females) and DNA barcodes for <i>P. yadongicus</i> and <i>P. zhaoi</i> are provided.