. Bulletin. Natural history; Natural history. May, 1953 Burks: The Mayflies of Illinois 83. Fig. 193,4.—Leptoplilebia sp., gill of fifth abdominal segment. Fig. 193fi.—Leptoplilebia sp., gill of first abdominal segment. Fig. 193C—Leptophlrbia sp., gill of seventh abdominal segment. Fig. 194/1.—Paraleptophlebia pracpedita, gill of fifth abdominal segment. Fig. 194B.—Paraleptophlebia praepedita, gill of first abdominal segment. Fig. 194C—Paraleptophlebia praepedita, gill of seventh abdominal segment. Fig. —Choroterpes basalis, gill of fifth abdominal segment. Fig. 195fi.—Choroterpes basali
. Bulletin. Natural history; Natural history. May, 1953 Burks: The Mayflies of Illinois 83. Fig. 193,4.—Leptoplilebia sp., gill of fifth abdominal segment. Fig. 193fi.—Leptoplilebia sp., gill of first abdominal segment. Fig. 193C—Leptophlrbia sp., gill of seventh abdominal segment. Fig. 194/1.—Paraleptophlebia pracpedita, gill of fifth abdominal segment. Fig. 194B.—Paraleptophlebia praepedita, gill of first abdominal segment. Fig. 194C—Paraleptophlebia praepedita, gill of seventh abdominal segment. Fig. —Choroterpes basalis, gill of fifth abdominal segment. Fig. 195fi.—Choroterpes basalis, gill of first abdominal segment. Fig. 195C—Choroterpes basalis, gill of seventh abdominal segment. Fig. 196/1.—Habrophlebia vibrans, gill of fifth abdominal segment. Fig. 1965.—Habrophlebia -vibrans, gill of first abdominal segment. Fig. 196C—Habrophlebia i-ibrans, gill of seventh abdominal segment. Fig. 197.—Paraleptophlebia praepedita, nymphal labrum, dorsal aspect. Fig. 198.—Habrophlcbiodes americana, nymphal labrum, dorsal 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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