Entomology : with special reference to its biological and economic aspects . Theimaginal muscles have beentraced back to mesodermalcells such as are always as-sociated with imaginal buds,Hymenoptera and Lepi-doptera.—The internaltransformation in Hymen-optera, according to Bugn-ion. is less profound thanin Muscida? and more ex-tensive than in Coleopteraand Lepidoptera. The in-ternal metamorphosis inLepidoptera resembles inmany respects that of Corc-tJira. In both these orders Internal transformations of Sphinx ligus- the (lorsal pair of prothOtri. A, larva; B, pupa; C, moth; a, aorta; .... ^ a
Entomology : with special reference to its biological and economic aspects . Theimaginal muscles have beentraced back to mesodermalcells such as are always as-sociated with imaginal buds,Hymenoptera and Lepi-doptera.—The internaltransformation in Hymen-optera, according to Bugn-ion. is less profound thanin Muscida? and more ex-tensive than in Coleopteraand Lepidoptera. The in-ternal metamorphosis inLepidoptera resembles inmany respects that of Corc-tJira. In both these orders Internal transformations of Sphinx ligus- the (lorsal pair of prothOtri. A, larva; B, pupa; C, moth; a, aorta; .... ^ an, antenna; b, brain; /, fore intestine; IaClC hUClS IS aDSeilt. lU a fr, food reservoir; /,, hind intestine; ht, fuH-grOWU Caterpillar theheart; m, mid intestine; mt, Malpighian ^ tubes; p, proboscis; s. subcesophageal gang- fuudaUieUtS of tllC imagiual lion; t, testis; tg, thoracic ganglia; ??, ven- 1 . , • /tt ^,t\ tral nerve Newport. ^egS aud WlllgS (Fig. 221 ) may be seen, the wings in afrontal section of the lar\a appearing as in Fig. 222. Many. DEVELOPMENT 183 of the details of the internal metamorphosis in Lepiciopterahave been described by Newport and Gonin. Figure 223,after Xewport, shows some of the more evident internal dif-ferences in the lar\a, pupa and imago of a lepidopterous of Pupal Stage.—To repeat—among holo-metabolous insects the function of nutrition Ijecomes relegatedto the larval stage and that of reproduction to the imaginalstage. Larva and imago become adapted to widely differentenvironments. So dissimilar are the two environments thata gradual change from the one to the other is no longer pos-sible ; the revolutionary changes in structure necessitate a tem-porary cessation of external activity. CHAPTER IV ADAPTATIONS OF AQUATIC INSECTS Ease, versatility and perfection of adaptation are beanti-fnllv exemplified in aquatic insects. Systematic Position.—Aquatic insects do not form a sepa-rate group in the system
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
