A new empidoid genus, Saigusamyia new genus and three new species (S. denningi new species, S. harkrideri new species, S. uvasensis new species) (Diptera: Empidoidea: Brachystomatidae) are described and illustrated. This new genus is related to a group of genera in the Trichopezinae, with fused epandrium and hypandrium and highly modified sperm pump. Adults of Saigusamyia are present primarily during the colder months in California (USA). The phylogenetic relationships of the Trichopeza genus-group are analyzed based on morphological data.
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