. The Intellectual observer. !%. THE GREAT WATER BEETLE. 1. Digestive apparatus of Dyiicus marginalis. 2. Spiracle of ditto, magnified. The Great Water-Beetle, 423 that he was unable to find any remains in the intestinal canal,upon his dissecting the beetle shortly afterwards. Thevoracious habits of the larva of Dyticus are as great as theyare in the perfect insect; but owing* to the greater strengthof the mandibles, and more fully developed muscular system ofthe beetle, the insect is a more formidable enemy to the otherinhabitants of the water than the larva.* The Dyticidee, how-ever, though
. The Intellectual observer. !%. THE GREAT WATER BEETLE. 1. Digestive apparatus of Dyiicus marginalis. 2. Spiracle of ditto, magnified. The Great Water-Beetle, 423 that he was unable to find any remains in the intestinal canal,upon his dissecting the beetle shortly afterwards. Thevoracious habits of the larva of Dyticus are as great as theyare in the perfect insect; but owing* to the greater strengthof the mandibles, and more fully developed muscular system ofthe beetle, the insect is a more formidable enemy to the otherinhabitants of the water than the larva.* The Dyticidee, how-ever, though naturally very voracious, are able to live someweeks without food. The male is recognized by his smoothelytra; the female has furrowed elytra and a rough male, moreover, is readily distinguished by the form ofhis fore feet, the two anterior tarsi of which are expanded intoa circular cavity on the under side, covered with a numberof suckers. The wing covers in both sexes are providedinternally with a pair of small memb
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishe, booksubjectscience
