L'entomologo di libro di testo : introduzione alla storia naturale, la struttura, la fisiologia e la classificazione degli insetti, compresi i crostacei e Arachnida . laborated inseveral lunghe navi interno, di cui le estremità arenarrowed e termina in un elemento tubolare di forma conica e il tubercolo,situato a tij) del labbro inferiore, che funge quindi da una spin- M M 398 ordini di PTILOTA. neret per lo scarico del silken thread. Caterpillarsare arredata anche con sei brevi ad articolazione gambe squamosa, attachedin coppie per il secondo, il terzo e il quarto di segmenti e di ri-presentando le gambe del futuro

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The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . laborated inseveral long internal vessels, of which the extremities arenarrowed and terminated in a tubular and conical tubercle, situated at the tij) of the lower lip, which thus acts as a spin- M M 398 ORDERS OF PTILOTA. neret for the discharge of the silken threads. Caterpillarsare also furnished with six short-jointed scaly legs, attachedin pairs to the second, third, and fourth segments, and re-presenting the legs of the future insect. They moreoverpossess from four to ten fleshy legs, armed at the extremitywith a circular series of innumerable little bent hooks: thehind pair of these false legs, as they have been termed, areplaced at the extremity of the body, near the anus; and it isby the assistance of these fleshy legs that the insect ingeneral retains its hold upon the substance upon which it isi:)laced: thus we find the fore-legs of the sphinx caterpillarsseldom employed except in progression, the insect, when atrest, raising the fore part of its body into a curved position.. Figs. ), Caterpillar swallow-tailed Moth {Ournpteryx sambucaria)—2. Caterpillar privetHiiwk-moth {Sphinx tigustri). whence the fanciful name of sphinx was given to this groupof insects. In like manner, many of the looper caterpillars, when at rest, erect themselves into an upright position, orat different angles with the branches, on which they are ob-served attaching themselves firmly by means of the hind])air of false legs alone, closely resembling, in this situation. LEPIDOPTERA : TRANSFORMATIONS. 399 small twigs—a resemblance greatly increased by the colourand warty appearance of many of these animals. Thesespecies have only ten or twelve legs, mcluding their six fore-legs, and have obtained their name of loopers from the curi-ous manner of their progression: seizing hold of the twigwith the fore-legs, they elevate t

Parole chiave associate all'immagine

• bookau
• bookcentury1800
• booksubjectcrustacea
• booksubjectinsects