File:Entomology - with special reference to its biological and economic aspects (1906) (14597269659).jpg

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Identifier: entomologywit00fols (find matches)
Title: Entomology : with special reference to its biological and economic aspects
Year: 1906 (1900s)
Authors: Folsom, Justus Watson, 1871-1936
Subjects: Entomology
Publisher: Philadelphia : P. Blakiston's Son
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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m, or diaphragm; ex, expiratory mus-cle; /, fat-body; g, ganglion; h, heart; in,inspiratory muscle; v, ventral septum, be-low which is the ventral sinus. The dorsaland ventral septa rise and fall periodically.—After Graber. I40 ENTOMOLOGY is not clearly ascertained, but it is thought that air is forcedinto these tubes by pressure from the abdominal muscles, whileits escape through the spiracles is being prevented by the com-pression of the stigmatal trachea?. The respiratory movements are entirely reflex and are inde-pendent of the brain or suboesophageal ganglion, for they con-tinue after decapitation and even in the detached abdomen ofa grasshopper or dragon fly. Each ventral ganglion of thebody is an independent respiratory center for its particular segment. lo. Reproductive System The sexes are always separate in insects, hermaphroditismoccurring only as an abnormal condition. The sexual organs,situated in the abdomen, consist essentially of a pair of ovaries Fig. 178, Fig. 179.
Text Appearing After Image:
Reproductive system of male beetle, MelolontJia. a, accessory gland; c, copulatoryorgan; d, ejaculatory duct; s, seminal vesicle;t, testis; v, vas deferens.—After Kolbe. Reproductive system of maleLepidoptera. a, accessory gland;d, ejaculatory duct; t, unitedtestes; v, vas deferens.—After Kot-BE. or testes and a pair of ducts (ozidiiets or seminal ducts, respec-tively). Primitively, the ducts open separately, as they stilldo in Ephemeridas, but in nearly all other insects the two ductsenter a common evacuating duct (vagina or ejaculatory duct) ;this opens ordinarily between the penultimate and antepenulti-mate segments of the abdomen, i. e.. usually the ninth andeighth, at any rate never through the last abdominal segment. ANATOMY .\ND PHYSIOLOGY 141 Homologies.—As in other animals, the reproductive or-gans are homologons in the two sexes. Thus: Male. Female. Testes = OfariesSeminal ducts ^ OziductsEjaculatory duct =^ Vagina Semi)ial vesicle = Soiiinal receptacleAccessory glands

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  • bookid:entomologywit00fols
  • bookyear:1906
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Folsom__Justus_Watson__1871_1936
  • booksubject:Entomology
  • bookpublisher:Philadelphia___P__Blakiston_s_Son
  • bookcontributor:Robarts___University_of_Toronto
  • booksponsor:University_of_Toronto
  • bookleafnumber:157
  • bookcollection:robarts
  • bookcollection:toronto
  • BHL Collection
Flickr posted date
InfoField
30 July 2014

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