Abstract
Two new black-fly species of the subgenus Simulium (Simulium) are described and illustrated, based on female specimens captured while approaching a human near a mountain summit in Doi Inthanon National Park, Chiang Mai Province, northern Thailand. The first species, Simulium suchariti sp. nov., is assigned to the griseifrons species-group and is distinguished from most other related species by the cibarium with tubercles near the base of its medial projection; the second, S. setsukoae sp. nov., is very similar to S. rufibasis of the tuberosum species-group but is distinguished from the latter by the shorter length of clustered stout hairs on the seventh abdominal segment and the ovipositor valve with its posteromedial corner widely bare.
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