. Bulletin. Natural history; Natural history. Mav. 1953 Burks: The Mayflies of Illinois 25. Fig. 38.—Ephoron leiikon, fore wing. Fig. 39.—Ephoron leukon, hind wing. Fig. 40.—Pentageriia I'ittigera, fore wing. Fig. 41.—Pentagenia vittigera, hind wing. Fig. 42.—Potamanthus verticis, fore wing. Fig. 43.—Potamant/ius -verticis, hind wing. Fig. 44.—Tortopus primus, fore wing. Fig. 45.— Tortopus primus, hind wing. Fig. 46.—Ephemera simulans, fore wing. Fig. 47.—Ephemera simulans, hind Please note that these images are extracted from scanned page images that may have been digitally enhanced fo
. Bulletin. Natural history; Natural history. Mav. 1953 Burks: The Mayflies of Illinois 25. Fig. 38.—Ephoron leiikon, fore wing. Fig. 39.—Ephoron leukon, hind wing. Fig. 40.—Pentageriia I'ittigera, fore wing. Fig. 41.—Pentagenia vittigera, hind wing. Fig. 42.—Potamanthus verticis, fore wing. Fig. 43.—Potamant/ius -verticis, hind wing. Fig. 44.—Tortopus primus, fore wing. Fig. 45.— Tortopus primus, hind wing. Fig. 46.—Ephemera simulans, fore wing. Fig. 47.—Ephemera simulans, hind 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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