. Economic entomology . Hypopus filicum. Copied from Dujardin. CASE side of the abdomen are the suckers by which it attaches itself. XIV. ^ Subsequently, M. Dujardin found other species on other insects, but still without understanding them any better; at last, in the month of September, while searching for Tardigrades on mosses and fern (Ceterach officinarum), he found a Hypopus in sufficient abundance, very similar to the other, but quite distinct, and which lived fastened by its suckers on the shin- ing leaves of that fern, as the other is fixed on the polished coats of insects. But one ver
. Economic entomology . Hypopus filicum. Copied from Dujardin. CASE side of the abdomen are the suckers by which it attaches itself. XIV. ^ Subsequently, M. Dujardin found other species on other insects, but still without understanding them any better; at last, in the month of September, while searching for Tardigrades on mosses and fern (Ceterach officinarum), he found a Hypopus in sufficient abundance, very similar to the other, but quite distinct, and which lived fastened by its suckers on the shin- ing leaves of that fern, as the other is fixed on the polished coats of insects. But one very remarkable thing came under his notice in studying this mite, namely, that amongst those that he so observed several were narrower, more transparent, and completely empty; some, much more rare and completely immovable, showed in the interior another form of mite, soft, and curled- up like an embryo, and occupying the whole of the internal cavity of the Hypopus, as if the latter had been the shell of an tgg^ but of an egg living and provided with feet, as the nympli of flies is contained in the shell formed of the hardened skin of the larva. The little mite inside had, according to Dujardin, palpi and chelate mandibles like the Gamasi and Dermanyssi, and he thence arrived at the conclu- sion, that these Hypopi, without mouth, without possible means of growth, living fixed by their suckers on polished surfaces^ from which no nutriment could be derived, must be larvae, or rather, if the phrase were allowable, eggs furnished with feet, and endowed with motion, in the interior of which, without aliments derived from without, the young Gamasus had to form itself at the expense only of the nourishment contained within. Consistently with this view, Hypopi should be found wherever the Gamasi live, and he maintains that that is just what is the case. On Geotrupes, Necrophonis, and Humble bees, which are
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