. Elementary lessons on insects. Insects. EPHEMERIDA 63. Fig. 22.—The flat nymph of the mayfly Heptagenia eltgantula. Drawing by Elsie 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 Needham, James G. (James George), 1868-1956. Springfield, Ill. , Baltimore, Maryland, C. C. Thomas

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Keywords: ., bookcentury1900, bookcollecti, bookdecade1920, booksubjectinsects