. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. a o. d e f Fig. S.—Thyridopteryx ephemerc^ormin. How the young larva prepares its bag. gnawing little bits from the surface, fastens these together with fine silk spun from its mouth. Continually adding to the mass, the larva finally. 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 United States. Bureau of Entomology. Washington : G. P. O.

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Keywords: ., bookcentury1800, booksubjectentomology, booksubjectinsects, booky