. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . Stone-fly, Perla bicaudata, and its larva. anterior pair, which rest flat upon the back. The insects them- selves are called "stone-flies," and are loosely jointed, flattened,

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1896