. Smithsonian miscellaneous collections. hly specialized organin which the food is prepared before it enters the more delicate ventric-ulus. The characteristic features of the proventriculus are a remarka-ble development of the chitinous intima into folds and teeth and aconsiderable increase of the size and development of the muscles ofthis region. On account of the importance of the proventriculus asa taxonomical characteristicum and of the general morphological in-terest of this structure, a more detailed discussion seems to benecessary. Lindeman, who was the first investigator of the Scolyt
. Smithsonian miscellaneous collections. hly specialized organin which the food is prepared before it enters the more delicate ventric-ulus. The characteristic features of the proventriculus are a remarka-ble development of the chitinous intima into folds and teeth and aconsiderable increase of the size and development of the muscles ofthis region. On account of the importance of the proventriculus asa taxonomical characteristicum and of the general morphological in-terest of this structure, a more detailed discussion seems to benecessary. Lindeman, who was the first investigator of the Scolytid proven-triculus, distinguished two main parts or longitudinal divisions. Theanterior part he called the Sack, the posterior, or caudad part, theKaumagen. Nuesslin and Fuchs followed Lindemans Sack (Lindeman) corresponds to the crop (Hopkins) and formsthe intermediate part between the oesophagus and the Kaumagen(Lindeman). Hopkins used the term proventriculus for the Kau- NO. 10 MORPHOLOGY OF GNATHOTRICHUS—SCHEDL 65. Fig. 34.—Gnathotrichiis matcriarius Fitch: Adult, alimentary canal and its appendages. A, fore intestine; B, mid-intestine; C, hind-intestine; Cr, crop; Mav, malpighian vessels;Oes, oesophagus; Pve, proventriculus; Re, rectum; Ve, ventriculus; a, large intestine;b. posterior tube of the mid-intestine; c, small intestine.
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
