. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. RIIYXCIIOTA. 569 and develop, protected by the drying-up body of the mother. They arc generally fertilized QCoccvs), but sometimes develop parthenogcnetically (^Lecanium, Aspldiotus). Unlike the female (and forming a single exception to what otherwise obtains in the order), the males undergo a complete metamorphosis ; the apterous larvte surround themselves with a cocoon, and are transformed into quiescent piipic. Many Coccidtc cause great damage in conservatories. Others are useful in industry, in
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. RIIYXCIIOTA. 569 and develop, protected by the drying-up body of the mother. They arc generally fertilized QCoccvs), but sometimes develop parthenogcnetically (^Lecanium, Aspldiotus). Unlike the female (and forming a single exception to what otherwise obtains in the order), the males undergo a complete metamorphosis ; the apterous larvte surround themselves with a cocoon, and are transformed into quiescent piipic. Many Coccidtc cause great damage in conservatories. Others are useful in industry, in that they produce a colouring matter (cochineal), while others are useful in causing, by their pimcture, an outflow of vegetable juices which when dried, are iised by man (_lac, manna). Axpidiotu-i nerii. Bouche, found on the Oleander, Lecanlum liei<peridui)i 1,., L. perxicce Bouch6. Kermis ilk-is L., on Quercus coccifera, also K, 1 (^Coccua') lacca Kerr., on Ficus religiosa in the East Indies. Coccna cacti L., (fig. 472) lives on Opuntia coccinellifera, Mexico, gives cochineal. C. adonidum L., C. (?) mAnnijJarus on Tamarix (manna). Fam. Aphidae,* plant-lice. As a rule, there are four transparent wings, with a scanty venation. The wings may, however, be absent in the female, and rarely in the male. The Aph idcB live on vegetable juices, and are found on roots, leaves and buds of quite definite plants. They frequently live in the spaces of gall-like swellings or deformities of leaves, which are produced by the punctures of the plant-lice. Many of them possess, on the dorsal surface of the antepenultimate segment, two "honey tubes," from which is secreted a sweet fluid —the honeydew—which is eagerly sought for by ants. In addition to the usually apterous females, which, as a rule, only appear in autumn with the winged males and lay fertilized eggs after coj)ulation. there are also viviparous, usually winged generations, which appear principally in the spri
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
