. Bulletin. Natural history; Natural history. 18 Illinois Natural History Survey Bulletin Vol. 26, Art. 1 is calird R^s in this report. The branches have been named .M, and M.^ by Ulmer (, pis. I, II) and 6 and 6' by Eaton ( pis. I-XXIII). The vein R^+s is of greatest importance, as it is the best land- mark that can be used in identifying the veins of the mayfly fore wing. Once it has been located (except in the greatly special- ized Oligoneuriidae), all other veins anterior and posterior to it can quickly be located. Traver considered R4+5 to be a branch of Rg, whereas Tillyard b
. Bulletin. Natural history; Natural history. 18 Illinois Natural History Survey Bulletin Vol. 26, Art. 1 is calird R^s in this report. The branches have been named .M, and M.^ by Ulmer (, pis. I, II) and 6 and 6' by Eaton ( pis. I-XXIII). The vein R^+s is of greatest importance, as it is the best land- mark that can be used in identifying the veins of the mayfly fore wing. Once it has been located (except in the greatly special- ized Oligoneuriidae), all other veins anterior and posterior to it can quickly be located. Traver considered R4+5 to be a branch of Rg, whereas Tillyard believed it to be a marginal --intercalary. PU- 7.—Generalized mayfly adult male, showing structures used in 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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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
