. Elementary entomology . FIG. 183. The hemispherical scale (Lecanium hemisphaericum Targ.) fi, scales on olive (natural size); l>, three female scales (considerably enlarged); c, female scale lifted from leaf, showing mass of eggs (enlarged). (After Marlatt, United States Department of Agriculture) of the genus and their near relatives, and are known as Lecaniums. 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 ol
. Elementary entomology . FIG. 183. The hemispherical scale (Lecanium hemisphaericum Targ.) fi, scales on olive (natural size); l>, three female scales (considerably enlarged); c, female scale lifted from leaf, showing mass of eggs (enlarged). (After Marlatt, United States Department of Agriculture) of the genus and their near relatives, and are known as Lecaniums. 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,
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