. Coleoptera : general introduction and Cicindelidae and Paussidae. ch 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 bee
. Coleoptera : general introduction and Cicindelidae and Paussidae. ch 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, Hyphoporus,Platynectes,Lacconectus, Bidessus, Copelatus, Cantliydrus, and the con-spicuous and gaily coloured Sandracottus which are confined toIndia, Eastern Asia, the Malay Eegion, and Family 7. GYIilNIDiE. Anlennm inserted under the side margins of the forehead behindthe base of the mandibles, very short and thick, eleven-jointed, the firstcylindrical and cup-shaped, the second ear-shaped and dilate on itsmargins, and the rest forming a closely adpressed club ; eyes entirelydivided into four; metasternum without suture; middle andhind legs both forming short broad paddles ; abdomen ivith sevenvisible ventral segments, the first two closely united at the sides,connate in the middle. These insects, commonly called Whirligig Beetles, are well known to all observers ; they arefound, usually, in groups on thesurface of the water, on which theyswim with great rapidity, so swiftlyin fact that the eye can hardlyfollow their motions. If muchalarmed they dive below the surfaceof the water, but seem unable tokeep down for more than a shorttime and soon reappear. Thefemales, as a rule, are larger andduller tha
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1912
