. Smithsonian miscellaneous collections. (-j snipi4)oii)Du[) smpi4opviij M o. ?* M n- -t tx w f^ ^ **3 ?oaq ] .5 s w — 0 u ZI _ *i C^ u 7 ^ ?J n u CS. 0. « t: -5 ,, S-. ; CJ ;- (]) V u V a; 0 W2 W VI c/; t/J t/; 8o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 THE ALIMENTARY CANAL The alimentary canal (fig. 39) of the larva shows some of the moreprimitive conditions of the highly specialized digestive system of theadult. It is about i^ times as long as the body. The same chief divi-sions as in the adult stage are clearly defined, but the proportions of thelength
. Smithsonian miscellaneous collections. (-j snipi4)oii)Du[) smpi4opviij M o. ?* M n- -t tx w f^ ^ **3 ?oaq ] .5 s w — 0 u ZI _ *i C^ u 7 ^ ?J n u CS. 0. « t: -5 ,, S-. ; CJ ;- (]) V u V a; 0 W2 W VI c/; t/J t/; 8o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 THE ALIMENTARY CANAL The alimentary canal (fig. 39) of the larva shows some of the moreprimitive conditions of the highly specialized digestive system of theadult. It is about i^ times as long as the body. The same chief divi-sions as in the adult stage are clearly defined, but the proportions of thelength of these are quite dififerent. The fore-intestine occupies onlyone-ninth of the whole alimentary canal while the mid-intestine is. Fig. 39.—Gnathotrichus inatcriarius Fitch: Alimentary canal and its appendages of a full-grown larva. A, fore intestine; B, mid-intestine; C, hind intestine; Mai, malpighian vessels; Oes,oesophagus; Re, rectum; Ie. ventriculus; a, region corresponding to crop and proventriculus;b, posterior tuIie of mid-intestine; c, large intestine; d, small intestine; e, reproductive canal. enlarged to spread over five-ninths of the same length. The gastriccoeca are small, the proventriculus absent and the Malpighian ves-sels are very strongly developed. Fare-intestine.—The epipharynx (fig. 38, Eph) is well developedand projects distally slightly over the anterior margin of the is distinctly defined from the labrum and clypeus ; four papillae occuranteriorly and a row of sensory pores medially. The latter puncturesare reduced to a single puncture in Ch. vest it us and are absent in Den-droctonus valeiis. according to the respective authors. The hypo-pharynx does not show any armature o
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
