THE SPECIES OF ISOCAPNIA BANKS (INSECTA, PLECOPTERA, NEMOURIDAE)

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Abstract
The stonefly genus Isocapnia has 10 known species in the North American Cordillera, 1 in Japan, and 1 in coastal Siberia. Of the American species, fraseri, hyalita, missourii, and mogila are here described as new, as is the Siberian species kudia. Unusual or perhaps unique among stoneflies is the occurrence of dwarf males, having rudimentary wings, along with normal males, in the Japanese and in several American species.

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