. Economic entomology. Beneficial insects; Insect pests; Thysanura. 23S ARACHNOIDEA. CASE with a form of Parthenogensis, which we otherwise know does occur among Acarids. In the course of this examination a Hy- popus, which continually appeared with Tyroglyphus, attracted his attention, by means of which he hoped to establish Dujardin's hypothesis. But he never succeeded in doing so. He found a Hypopus in the act of metamorphosis, and thereby satisfied him- self that it could have no possible relation with Gamasus; and he speaks with confidence, because for three years he brought up Tyroglyphi
. Economic entomology. Beneficial insects; Insect pests; Thysanura. 23S ARACHNOIDEA. CASE with a form of Parthenogensis, which we otherwise know does occur among Acarids. In the course of this examination a Hy- popus, which continually appeared with Tyroglyphus, attracted his attention, by means of which he hoped to establish Dujardin's hypothesis. But he never succeeded in doing so. He found a Hypopus in the act of metamorphosis, and thereby satisfied him- self that it could have no possible relation with Gamasus; and he speaks with confidence, because for three years he brought up Tyroglyphi and Hypopi from hyacinth bulbs in his work-room without ever a single Gamasus making its appearance from or in connection with the others. The Hypopi were in thousands, but they were all of the same size; and the young stage, or individuals in the act of transformation, were not to be found. Neither did he observe any difference of sex, as all examples resembled one another throughout. Nor could any individuals with eggs be found. The manner of increase of the Hypopus thus appeared in the highest degree enigmatical, the more so that the extreme stiffness of the mail-like skin renders the idea of growth after it has acquired it inadmissible. The conclusion forced itself upon. Young larva of Rhiz'-glyphus echinatiis (Tyrog-lyphus dujardinii, Clap.), the posterior leg's not visible from above. Copied from Claparfede's 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 Murray, Andrew, 1812-1878. [London] Chapman and Hall
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