The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . lar or oval case, formed of the skin of the larva. Example, Musca,(Estrus. Now the true winged insects necessarily suffer only thefom* latter species of metamorphosis ; although in those spe-cies of the semicomplete kind, which have no wings in theperfect state, it may with equal propriety be said that theybelong to the first section, in which the pupa is complete : LATREILLIAN ARRANGEMENT OF PUP^. 197 these, however, must be regard
The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . lar or oval case, formed of the skin of the larva. Example, Musca,(Estrus. Now the true winged insects necessarily suffer only thefom* latter species of metamorphosis ; although in those spe-cies of the semicomplete kind, which have no wings in theperfect state, it may with equal propriety be said that theybelong to the first section, in which the pupa is complete : LATREILLIAN ARRANGEMENT OF PUP^. 197 these, however, must be regarded only as exceptions, be-longing in reality to the second, and not to the first , to whom Entomology is so much indebted, dis-tinguishes three species of metamorphosis, to which, with aview to obviate the difficulties arising from the Fabricianmode of nomenclature, he has apphed a different series ofnames, calhng the first Metamorphosis inchoata, dimidiata,and perfecta. The first of these terms is applied to wing-less insects, such as the Scolopendrce, luli, &c., and in whichthe variations of the larva and pupa states are so indistinct. that the terms cannot with propriety be employed, the meta-morphosis consisting occasionally of an increase in the num-ber of limbs and rings (figs. 27, 28, magnified; and 29,natural size, representing the growth of an lulus). In thespecies undergoing the metamorphosis dimidiata, the dif-
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Keywords: ., bookau, bookcentury1800, booksubjectcrustacea, booksubjectinsects
