Pelopidas jansonis is a butterfly in the family Hesperiidae (Hesperiinae). It is endemic to Japan. The larva feeds on Miseanthus (Graminea). There are two broods. The larva of the second brood hibernates.Taro Iwase, 1954 Synopsis of the known life-histories of Japanese butterflies The Lepidopterists' News 1954: 95-100 pdf
Etymology The specific name honours Edward Wesley Janson.
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