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But nowhere among the Crustacea is there a mode of development comparable to the "complete metamorphosis" of the Insecta, nowhere among the young or adult Crustacea are there forms which might resemble the maggots of the Diptera or Hymenoptera, the larvae of the Coleoptera, or the caterpillars of the Lepidoptera, still less any bearing even a distant resemblance to the quiescent pupae of these animals.
There is a curious circumstance belonging to the class of insects which have two wings, or diptera, analogous to the rudiments of stamens above described; viz. two little knobs are found placed each on a stalk or peduncle, generally under a little arched scale; which appear to be rudiments of hinder wings; and are called by Linneus, halteres, or poisers, a term of his introduction. A.T. Bladh.
For example, the adults in the chief orders of Insects have the typical three pairs of legs, while the maggots or grubs of the Diptera or Hymenoptera have no legs at all, the caterpillars of Lepidoptera have evolved pseudo-legs on the abdomen, and the larvae of Coleoptera have the ordinary legs and no more.
Thus an almost new field remains for the Entomologist in the study of the yet unknown Singhalese Diptera, which must be very numerous. Order HEMIPTERA. "The species of this order in the list are too few and too similar to those of Hindustan to need any particular mention.
Among the Pyralites, Hymenia recurvalis inhabits also the West Indies, South America, West Africa, Hindustan, China, Australasia, Australia, and New Zealand; and its food-plant is probably some vegetable which is cultivated in all those regions; so also Desmia afflictalis is found in Sierra Leone, Abyssinia, Ceylon, and China. Order DIPTERA. "About fifty species were observed by Dr.
These succinct details will recall to the memory of all travellers many others that are analogous; and those persons who have never left Paris can imagine the ceiling blackened with smoke and the mirrors specked with millions of spots, showing in what freedom and independence the whole order of diptera lived in the Cafe de la Paix.
On the other hand, taking the caterpillar or bee larva, with their cylindrical, fleshy bodies, in most respects typical of larval forms of the Hymenoptera, Lepidoptera and Diptera, as the type of the cruciform larva, etc. * The larvæ of the earliest insects were probably leptiform, and the cruciform condition is consequently an acquired one, as suggested by Fritz Müller."
This is true of the larva? of the sheep bot-fly, which develop in the sinuses of the head, causing severe inflammation of these parts, nervous symptoms and death. The character of the symptoms of a parasitic disease depends on the habits of the parasite, and the tissue or organ, that it may attack. The parasitic flies belong to the order Diptera, and the families Muscidae and OEstridae.
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