. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. (iO.—a, cocoon of Sphecius, natural size; h, enlarged sec- tion of pore. (After Riley.). 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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