. Economic entomology . Young- stage of Tyroglyphus develo inside of Tyrog-lyplius dujardinii. Copied from Claparcde. him, that the young stage of the Hypopus must be sought for under quite another form. It next occurred to him that he might succeed better by following the development of the Tyroglyphus from the beginning through its various stages. This he did, and first he found the six-footed larva proceed from the ^gg, bearing,

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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondonchapmanandha