| OCR Text |
Show KEYS The following keys fication of twelve families, families thidae, genus in Idaho. occur, that and Of have have Of the and Baetisca is better designed have species these restricted not in these Lachlania been of be to keys. thought or mayfly The three Potaman- eastern or southin occur mayfly genera, Of these, four Hagen, Ametropus Albarda, included Once these and family keys. expected to North American unknown from Idaho. known to mayflies fifteen North American in identi facilitate mayflies occurring, included are included Walsh, to omitted, Neoephemeridae, fifty-three are all the and would Isonychia Eaton, presently of Behningiidae, thirty genera genera, are been been eastern North America Idaho. FAMILIES AND GENERA all western North American identification to to TO THE the although they are mayfly fauna of Idaho found to occur genera may be within the state. 1 forewing veins MP and CuA strongly divergent at base with vein MP2 strongly bent towards euA basally (Figs. 197, 201, 210); vein MA of hind wings unforked (Figs. 198, 202, 211); hind tarsi foursegmented •••••.••••••••.•••••.•.•••••••.•••.••. Adults Stem of forewing veins MP and CuA little divergent and vein MP2 usually more stem of symmetrical (Figs. 4, 31, 59, 63, 117, 121, 154, 193, 213, 218); vein MA of hind wings unforked or forked, or hind 2 |
