A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . ction of this cellular tube withthe tracheae. It is found in the base of the wing where the lumenof the tracheae is much widened. I only describethe fully formed rib (rif>pe). In a cross-section itforms a usually cylindrical tube which is coveredby a very thin chitiuous intima which bears deli-cate twigs (Fig. 161). These twigs are analogous to the thickenedridge of thetracheal intima. I Can
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . ction of this cellular tube withthe tracheae. It is found in the base of the wing where the lumenof the tracheae is much widened. I only describethe fully formed rib (rif>pe). In a cross-section itforms a usually cylindrical tube which is coveredby a very thin chitiuous intima which bears deli-cate twigs (Fig. 161). These twigs are analogous to the thickenedridge of thetracheal intima. I Can 866 11O connection be- tween the branches of the differ-ent twigs. Through the ribs(Iippeii) extend a central cord(c) which shows in longitudi-nal section a clear longitudinalstreaking. Semper regarded itas a nerve. But the connectionof the tube with the trachea con-tradicts this view. I can onlyregard the cord as a separation-product of the cells of the walls. Other historical elements. - T^poo qvp hi nod IvrmYh rnv L-lvmPn> l puscles, blood-building masses,and nerves. Scliaeffer states that in the immature pupal wingswe find besides the large tracheae, which are more or less branched,.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
