. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. no ECONOMIC ENTOMOLOGY spines; cerci of male narrowing from tip to base and subgenital plate narrower at apex than at 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 Lochhead, William, 1864-. Philadelphia, Blakiston

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919