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 . ed. 130 TEXT-BOOK OF ENTOMOLOGY These observations on two widely separate groups of Diptera were confirmedby Landois, and afterwards by Pancritius, for the Lepidoptera, by Ganin for theHymenoptera, by Dewitz for Hymenoptera (ants) and Trichoptera ; also for theNeuroptera by Pancritius. In the ant-lion (Mi/rnii-lnni fnniiirariuf;) Pancritiusfound no rudiments of the wings in larvse a year old, b
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 . ed. 130 TEXT-BOOK OF ENTOMOLOGY These observations on two widely separate groups of Diptera were confirmedby Landois, and afterwards by Pancritius, for the Lepidoptera, by Ganin for theHymenoptera, by Dewitz for Hymenoptera (ants) and Trichoptera ; also for theNeuroptera by Pancritius. In the ant-lion (Mi/rnii-lnni fnniiirariuf;) Pancritiusfound no rudiments of the wings in larvse a year old, but they were detected inthe second year of larval life, and do not differ much histologically or in shapefrom those of Lepidoptera. In the Coleoptera and Hymenoptera the imaginalbuds appear rather late in larval life, yet their structure is like that of Lepi-doptera. In Cimbex the rudiments of the wings are not found in the younglarva, but are seen in the semipupa, which stage lasts over six weeks. The general relation of the rudiments (imaginal buds) of the wingsof a tineid moth to the rest of the body near the end of larvallife may be seen in Figs. 142,143 (Tinea ?), the sections not, however,. Fir,. 143. — Section of the same specimen as in Fig. 142, but cut through the second pair of wings(w): i, mid-intestine; h, heart; fb, fat-body; I, leg; >/, nervous cord. showing their connection with the hypodermis, which has been tornaway during the process of cutting. That the wing is but a fold oftin- hypodermis is well seen in Fig. 144, of Datana, which representsa much later stage of development than in Figs. 142 and 143, thelarva just entering on the semipupa stage. In caterpillars of stage I, 3 to 4 mm. in length, Gonin found thewing-germs as in Fig. 14r>. A being a thickening of the hypodermis,with the embryonic cells, of Verson, on the convex two leaves, or sides of the wing, begin to differentiate in stageII (C, Z)), and in stage I I 1 the envelope is
Size: 1782px × 1402px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
