. Coleoptera : general introduction and Cicindelidae and Paussidae. ng envelope or capsule is shown at a) ; si, vasdeferens; ag, ductus ejaculatorius ; dr, accessory glands ; nu, aedeagus ;m, muscles. (After Graber.) These facts were pointed oat by Korschelt and and others are of the opinion that the ovaries with thesingle and well developed terminal egg-chamber represent a higher o2 20 INTRODUCTION. and more differentiated type, but this is open to question. Theother important female organs of reproduction are the vaginaleading to the eopulatory pouch and the spermatheca or
. Coleoptera : general introduction and Cicindelidae and Paussidae. ng envelope or capsule is shown at a) ; si, vasdeferens; ag, ductus ejaculatorius ; dr, accessory glands ; nu, aedeagus ;m, muscles. (After Graber.) These facts were pointed oat by Korschelt and and others are of the opinion that the ovaries with thesingle and well developed terminal egg-chamber represent a higher o2 20 INTRODUCTION. and more differentiated type, but this is open to question. Theother important female organs of reproduction are the vaginaleading to the eopulatory pouch and the spermatheca or recepta-culuin seminis. In the male the chief internal organs which answer to theovaries of the females are the testes, the secretion from which isconveyed by the vasa deferentia into the vesiculse seminales. Thetwo testes may consist of simple coiled tubes or of a number offollicles opening into a common tube; these are often containedin a capsule. In the Adephaga the tubular structure is found,whereas in the rest of the Goleoptera they appear to be follicular;.. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1912
