File:Coleoptera - general introduction and Cicindelidae and Paussidae (1912) (14784571252).jpg

Identifier: coleopteragenera00fowl (find matches)
Title: Coleoptera : general introduction and Cicindelidae and Paussidae
Year: 1912 (1910s)
Authors: Fowler, W. W. (William Weekes), 1849-1923
Subjects: Tiger beetles Ground beetles Beetles
Publisher: London : Taylor and Francis
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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elo- water mark 5 and fourthly, thatgrammus. Larva x 10. (After like the Cetacea, they cannot liveSchiodto. without coming to the surface for air, which is taken in underthe elytra by the insect exposing the hind tip of its body justabove the surface. In Dytlscus the females are often deeply grooved on the back,thus affording the male a better hold, although it hardly requiresit, as the front foot is dilated into a remarkable palette, coveredwith suckers of various sizes (fig. 27); dimorphic forms of thefemale resembling the male also occur. In many of the smallerspecies (Hydroporus, etc.), the males are bright and shining andthe females dull, the sculpture being rougher. The larvae of the DYTisciDiE are long insects with large, moreor less sickle-shaped jaws, which are not toothed, but are furnishedwith a lobe near the tip and another at the base and a canalpassing through their length, through which they suck their preyafter piercing it with the sharp tips. They vary in the shape of
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DYTISCID.E. GYBJNIDiE. 65 the cerci and anal appendages, number of joints of the antennas,etc., and, in some species (e. g. Hyphydrus ferrugineus) the headis produced into a distinct horn, which is touched at about threequarters of its length from the base by the tips of the mandibles. The Dytiscid^: are for the most part characteristic of the Paiae-arctic region and seem to prefer, as a whole, cold to warmerwater; they are, however, found all over the globe, and occur inbrackish and more or less salt w7ater as well asin fresh, in running streams or stagnant pools,and one or two species have been found inthermal springs. In all, about 1800 or 2000members of the family are known. The Indianspecies appear to have been very littleworked and the following genera are almostthe only ones that seem to be at presentknown as occurring in the country :—Dytiscus(IVogus), Hydrocoptus, Laccophilus, Hydro-Tig. 29.—Hydaticus vatus (several species), Cybister, Hyphydrus,festivus. Hydaticus, Hypho

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