. Un manuel de zoologie élémentaire . Zoologie. Les insectes Les insectes 285. Le changement par lequel une larve devient un adulte est connue sous le nom de sa métamorphose. La forme adulte de l'insecte est connu sous le nom de son imago, et le epimorpha ont une métamorphose incomplète. D'autres insectes ont un stade larvaire et une métamorphose plus ou moins complète. (2) Dans certaines libellules et autres insectes, au stade où la métamorphose a lieu l'animal est libre et active et est connue comme une nymphe. Ces insectes sont. Fig. 191.-la-puce navet beetle (Haltica olivinus silvestri). De Theobald. ±, Adulte, amplifié ; 2, vrai

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. A manual of elementary zoology . Zoology. INSECTS 285 insects. The change by which a larva becomes an adult is known as its metamorphosis. The adult form of an insect is known as its imago, and the epimorpha are said to have an incomplete metamorphosis. Other insects have a larval stage and a more or less complete metamorphosis. (2) In dragonflies and certain other insects, at the stage in which the metamorphosis takes place the animal is free and active and is known as a nymph. Such insects are. Fig. 191.—The Turnip Flea-beetle (Haltica nemorum). From Theobald. ±, Adult, magnified; 2, true length and wing expanse; 3, adult feeding on leaf; 4, egg, natural size; 5, the same magnified; 6, 7, tunnel made by larva in leaf; 8, 9, larva, natural size arid magnified; 10, ti, natural size and magnified view of pupa, which lies in soil. This very destructive insect feeds, as larva and adult, on the leaves of turnips, cabbages, broccoli, and other Crucifera. It has many broods in the year, the last hibernating under stones, etc. Its worst damage is done to seedlings. Paraffin, or a mixture of soot and lime are remedies. Hemimetabola. (3) In the rest of the insects, including beetles, ants, bees and wasps, flies and butterflies, the insect passes through an almost motionless stage known as the pupa. These insects are called Holometabola, and in them the metamorphosis is very complete. The body of the pupa undergoes a profound reorganisation. A few of the most important systems of organs, such as the repro- ductive, nervous, and circulatory, last on, but the others are devoured by a phagocytic action (p. 100) of the blood corpuscles and re-formed by the growth of certain clumps. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder

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