Abstract
Perlomyia gakken sp. nov. (Plecoptera: Leuctridae) from Kyoto Prefecture, Honshu, Japan, is described and illustrated. This new species is distinguished from all other Perlomyia species by having a remarkably long and slender epiproct with a crochet hook shape at tip. Although, this new species is most similar to P. kappa Sivec and Stark, 2012, but can be discriminated from P. kappa by the three morphological differences: (1) cercus with small spine-like apex (long terminal spine in P. kappa), (2) epiproct slightly swollen at middle in lateral aspect (swollen basally in P. kappa), and (3) epiproct like a crochet hook shape apically in lateral aspect (expanded apically in lateral aspect in P. kappa). A checklist and type localities map for 25 currently recognised Perlomyia species are also presented.
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