File:Coleoptera - general introduction and Cicindelidae and Paussidae (1912) (14782555064).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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t as the seventh, it is better in descriptionsto speak of the last and penultimate joints. Internal Structure. Many of the older writers on insects, such as Burmeister,Dufour, Newport, etc., paid considerable attention to the internalstructure and economy of insects, and, to judge by the way inwhich their work and figures are used by recent authors, they musthave been in the main very acute observers. The best generalbooks on these matters seem to be Packards Text-Book ofEntomology and Kolbes Insektenkimde: the work of Dr. Sharpin the Cambridge Manual of Natural History, Vols. Y and VI,is also useful, and there is much that is valuable in BurmeistersManual of Entomology (1836), pp. 119-301. The writers onparticular points of structure etc. are legion, as may be seen byexamining the bibliography of any particular section. 10 INTRODUCTION. The Alimentary Canal. The organs of nutrition in insects consist of the intestinal canaland its appendages. Except very rarely in the case of certain
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Fig. 6.— Dytiscus marginalis, male, opened from the back, a, cesopbagus orcrop ; h, proventriculus or fore-stomach ; c, ventriculus or mid-intes-tine, with hair-like cascal glands, passing into the long intestine (ileum,colon, and rectum): the fine threads represent the Malpighian tubes; d,much developed cascal appendage : e, reservoir for secretion of anal gland ;/, hind tarsus ; i, dilated joints of anterior tarsus ; o, femur ; r, gedeagus;vhm, extensor muscle of hind leg ; dr, accessory gland ; ho, testis ; B) B0,B3, apodemes, or processes supporting the divisions of the thorax. It willbe noticed that the ganglia (lying close to B3 and B.2) show considerableconcentration. (After Graber.) THE ALIMENTARY CANAL. 1 1 larvae, this canal in all insects is terminated by a mouth at one endand an anus at the other. The mouth opens upon the pharynx,which, in the Coleoptera, is merely a slightly widened commence-ment of the (esophagus, and need not be considered as distinctfrom the latter.

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