. Elementary lessons on insects. Insects. 2dA IstA Cu2. 5 th a 4ttiA. Fig. 5.—The venation of the wings of the stonefly, Perla capitata. Principal veins are marked by capitals; cross-veins, by small 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