. Un traité sur les insectes nuisibles à la végétation . Les insectes nuisibles. 34 COLEOPTERA. plus épais, et beaucoup plus petits. Le premier d'entre eux, la soirée ou vespertine, Omaloplia est bay-brun ; l'aile- couvre sont marqués d'un grand nombre de sillons peu profonds longitudinale, qui, avec le thorax, sont abondamment percé. Ce coléoptère varie en longueur de trois à quatre dixièmes de pouce. Omar hplia sericea, soyeux, l'Omaloplia ressemble étroitement à la pré- céder en tout, mais sa couleur, qui est un marron très profond, irisées ou modifiables comme le satin, et re- flecting les couleurs de l'arc en ciel.

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. A treatise on some of the insects injurious to vegetation . Insect pests. 34 COLEOPTERA. thicker, and much smaller in size. The first of them, the vespertine or evening Omaloplia, is bay-brown; the wing- covers are marked with many longitudinal shallow furrows, which, with the thorax, are thickly punctured. This beetle varies in length from three to four tenths of an inch. Omar hplia sericea, the silky Omaloplia, closely resembles the pre- ceding in everything but its color, which is a very deep chestnut-brown, iridescent or changeable like satin, and re- flecting the colors of the rainbow. All these Melolonthians are nocturnal insects, never ap- pearing, except by accident, in the day, during which they remain under shelter of the foliage of trees and shrubs, or concealed in the grass. Others are truly day-fliers, commit- ting their ravages by the light of the sun, and are conse- quently exposed to observation. One of our diurnal Melolonthians is supposed by many nat- Rg. io. uralists to be the Arwmala varians (Fig. 15) of Fabricius; and it agrees very well with this writer's description of the lucicola; but Professor Germar thinks it to be an unde- scribed species, and proposes to name it cce- lebs. It resembles the vine-chafer of Europe in its habits, and is found in the months of June and July on the cultivated and wild grape-vines, the leaves of which it devours. During the same period, these chafers may be seen in still greater numbers on various kinds of sumach, which they often completely despoil of their leaves. They are of a broad oval shape, and very variable in color. The head and thorax of the male are greenish black, margined with dull ochre or tile-red, and thickly punctured; the wing-covers are clay-yellow, irregu- larly furrowed, and punctured in the furrows; the legs are pale red, brown, or black. The thorax of the female is clay- yellow, or tile-red, sometimes with two oblique blackish spots on the top, and sometimes almost entirely black; the w

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