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Pentagenia vittigera Walsh; nymph. Nymph from above, with the gills on the right pushed aside to show the markings of the abdomen
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Ephemera varia Eaton; adult. Adult male 27; Legs of one side of the same 28; End of abdomen of the same from beneath 29
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Hexagenia nymphs. Nymph of H. bilineata Say, dorsal view. The hind feet are turned forward for comparison with the other feet, and the gills on the right are moved aside to show the markings on the abdomen. The 3-branched, rudimentary gills on the first abdominal segment are abnormal
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Pentagonia vittigera Walsh; adult. Adult mail of the quadripunctata form 15; Legs of one side 16; End of abdomen of male from beneath 17; End of abdomen of female from beneath 18
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Hexagenia bilineata Say; adult. Adult male (segmentation of the tails omitted...) 1; Legs of one side, fore, middle, and hind from left to right... 2; end of the abdomen of the male from beneath, showing forceps, penes, and base of tails; middle tail rudimentary
