. Elementary entomology . Fig. 183. The hemispherical scale {Lecanium hemisphaericum Targ.) (T, scales on olive (natural size); b, three female scales (considerably enlarged); r, female scale lifted from leaf, showing mass of eggs (enlarged). (After Marlatt, United States I3epartment of Agriculture) of the genus Lecaninni and their near relatives, and are known as Lccaniums. They are usually of a brownish color, quite strongly convex (often ridged), and are soft and easily crushed, — hence the name. The upper surface of the female gradually hardens, and upon ma- turity she dies and the old ski
. Elementary entomology . Fig. 183. The hemispherical scale {Lecanium hemisphaericum Targ.) (T, scales on olive (natural size); b, three female scales (considerably enlarged); r, female scale lifted from leaf, showing mass of eggs (enlarged). (After Marlatt, United States I3epartment of Agriculture) of the genus Lecaninni and their near relatives, and are known as Lccaniums. They are usually of a brownish color, quite strongly convex (often ridged), and are soft and easily crushed, — hence the name. The upper surface of the female gradually hardens, and upon ma- turity she dies and the old skin forms the scale which covers the eggs laid be- neath it. The Lecaniums occur upon various greenhouse plants such as crotons, upon the peach and plum, and upon citrous fruits. The cottony maple scale is a species common on maple shade trees and gives off a mass of cottony wax in which the eggs are laid. The. armored scales are much smaller, flat, circular, or elongate in outline, and include our most common species. Upon hatching, the young scale insect crawls about for an hour or two and then settles down, inserts its beak in the leaf or bark, and henceforth the females remain in the same place. Soon waxy fila- ments commence to exude from the body, which mat down into a small scale covering the insect. When the skin is molted, it is added to the center or one end of the scale, Fig. 185. The oyster- , . , . , ,, , , , shell scale on poplar twig which IS gradually enlarged and assumes a (Photograph by Weed) characteristic shape. With the first molts the
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
