. Fresh-water biology. Freshwater biology. A B CD Fig. 1331. Arrkenurus. A, A. forpicatus Neuman; dorsal surface of female. X 27. B, Palpus of A. albator (Miiller), outer side, male. X 113- C, A. maculator (Miiller), dorsal surface, male. X 30. Z), .4. g/o6fl/or (MuUer), dorsal surface, male. X39. All European species. (Modified from Piersig.) The females of this genus are approximately oval in form and possess few characters by which they may be distinguished, but the males are highly and variously modified in form and possess complicated accessory sexual structures, including a copulatory or

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. Fresh-water biology. Freshwater biology. A B CD Fig. 1331. Arrkenurus. A, A. forpicatus Neuman; dorsal surface of female. X 27. B, Palpus of A. albator (Miiller), outer side, male. X 113- C, A. maculator (Miiller), dorsal surface, male. X 30. Z), .4. g/o6fl/or (MuUer), dorsal surface, male. X39. All European species. (Modified from Piersig.) The females of this genus are approximately oval in form and possess few characters by which they may be distinguished, but the males are highly and variously modified in form and possess complicated accessory sexual structures, including a copulatory organ, the petiole. Leg. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918