Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . f scales) dif-fers in the scale being oval, almost entirelyflat, and of a pure milk white color, withred eggs, while those of the Oyster shellbark-louse are milk white, and the larvaeare at first blood red. It occurs on the appleand pear, and is far less injurious than theother species. Fig. 533. PsYLLiD^ Latreillc, These small Leaf- hoppers are found hopping over the surface of leaves and oftenraising galls. They are flattened and provided with s
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . f scales) dif-fers in the scale being oval, almost entirelyflat, and of a pure milk white color, withred eggs, while those of the Oyster shellbark-louse are milk white, and the larvaeare at first blood red. It occurs on the appleand pear, and is far less injurious than theother species. Fig. 533. PsYLLiD^ Latreillc, These small Leaf- hoppers are found hopping over the surface of leaves and oftenraising galls. They are flattened and provided with short legsand a broad head, and covered with a white cottony mass inthe larva state. In the mature insect the forked antennae areeight to ten-jointed, with two slender terminal bristles formingthe fork. There are three remote ocelli; the beak is three-jointed, reaching to themiddle of the chest, andthe epimera of the meta-thorax terminate behind inb€>^ a.^^ c^n acute spine on each Fig. 534. spineside. The limbs are short,ivith thickened shanks, and two-jointed tarsi. The wings arethickened and folded roof-like over the body, and the three.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
