Histoire naturelle des insectes : comprenant leur architecture, transformations, sens, nourriture, habitudes-- collection, conservation et arrangement . jusqu'à la sève, exubérant par les perforations, et épaississant par contact avec le theair, l'entoure avec un épais mur charnel de substance végétale livinglégume, intermédiaire dans la texture entrele bois et la feuille, étant plus doux que le formerand plus dur que ce dernier. Dans ce petit cham-ber douillet, sécurisé de l'intrusion de lady-oiseaux et des théorbes de mouches aphidivores (Syrfhi), elle se rendit son nombreuses couvée de jeunes, qui m'aident avec dihément dans l'enlar

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Natural history of insects : comprising their architecture, transformations, senses, food, habits--collection, preservation and arrangement . till the sap, exuding throughthe punctures, and thickening by contact with theair, surrounds it with a thick fleshy wall of livingvegetable substance, intermediate in texture betweenthe wood and the leaf, being softer than the formerand harder than the latter. In this snug little cham-ber, secure from the intrusion of lady-birds and thegrubs of aphidivorous flies (Syrfhi), she bringsforth her numerous brood of young ones, who imme-diately assist in enlarging the extent of their dwelling, by puncturing the walls. In one respect, however, the galls thus formed differ from those of the moun-tain-ash just described, —those of the poplar havingalways an opening left into some part of the cell, andusually in that portion of it which is elongated intoan obtuse beak. From this opening the young, whenarrived at the winged state, make their exit, to form GALL-APHIDES. 393 new colonies; and during their migrations, attractthe attention of the most incurious by the singularityof their appearance.*. Galh produced on the leaves and leaf-stalhs of the Poplar hyEriosoma populi, with the various for vis of the insects, rumged, not?winged, and covered xuith vjool. On the black poplar there may be found, later inthe season than the preceding, a gall of a very dif-ferent form, though, like the other, it is ibr the mostpart on the leaf-stalk. The latter sort of galls areof a spiral form; and though they are closed, theyopen upon slight pressure, and appear to be formedof two laminae, twisted so as to unite. It is at this J. R. 394 INSECT ARCHITECTURE. opening that an aperture is formed spontaneously forthe exit of the insects, when arrived at a perfect state.In galls of this kind we find aphides, but of a dif-ferent species from the lanigerous ones/ which formthe horn-shaped galls above described. Leaf-Rolling Aphides. It may not be improper to int

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• bookcentury1800
• bookidnaturalhistoryof01bos
• booksubjectinsects