. Coleoptera : general introduction and Cicindelidae and Paussidae. Fig. 13.—Keproductive organs of a male bark-beetle, ho, testicle ; si, vasdeferens; bl, seminal vessel; og, ductus ejaculatorius; dr, accessorygland. (After Graber.) it must, however, be admitted that hardly a sufficient number ofspecies have been dissected to justify a very wide generalisationin this respect. The vasa deferentia are fine tubes, varying verymuch in length (in Dytiscus they are five times, and in Cetoniaaurata thirty times as long as the body), and they are furnished s f; Fig. 14.—iEdeagus of Phi
. Coleoptera : general introduction and Cicindelidae and Paussidae. Fig. 13.—Keproductive organs of a male bark-beetle, ho, testicle ; si, vasdeferens; bl, seminal vessel; og, ductus ejaculatorius; dr, accessorygland. (After Graber.) it must, however, be admitted that hardly a sufficient number ofspecies have been dissected to justify a very wide generalisationin this respect. The vasa deferentia are fine tubes, varying verymuch in length (in Dytiscus they are five times, and in Cetoniaaurata thirty times as long as the body), and they are furnished s f; Fig. 14.—iEdeagus of Philonthus nigritulus, $. , duct entrance;, duct exit; s, sac ; /, furca ; a, appendage. (Original from drawingby Sharp.) with accessory glands, consisting of tubes, the secretions of whichmix directly with the semen. The majority of Goleoptera possessone pair, but several pairs are present in some families (e. g.,,Hydeophilid^e and ElateriDje). Several of these points will be ORGANS OF SENSE. 21 again alluded to under classification ; they have been particularlyworked out by Bordas (Ann. Sci. Nat. (8) xi, 1900, pp. 283-448);Leon Dufour (Recherches anatomiques sur les Carabiques, etc.,Ann. Sci. Nat. (1) vi, 1825, p. 152); and Escherich ( Anatomischestudien iiber das mannliche Grenitalsystem der Coleopteren,Zeitschr. fur wissensch. Zoologie, lvii, 1894, pp. 620-641, ). There are many secondary characters belonging to the of these, which might be called direct characters, are adap-tations for holding the female, e. g. the dila
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1912
