. Memoirs of the American Entomological Society . n: OS52 VVO f IOS rHs f ?<initMOS 1 TH< f. AMERICAN E ) M OLOG IC II E R 3 2 CIETY THE GENUS ISOPERLA (PLECOPTERA) OF WESTER ORTH AMERICA; HOLOMORPHOLOGY AND SYSTEMATICS, AND A NEW STONEFLY GENUS CASCADOPERLA STANLEYMNETH YTKO ?\\i \ i) i\HT f. %*••«&- \fi& PUl 1) BY THE AY AT THE A< SOCIETY ;xcesmemoirsofam3233197981amer

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