Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE INSECT WORLD. 125 differ by the lack of wings and the usually small size compared with the normal sexless form. Pairing takes place as soon as the female is sexually mature, and in a very few days after- wards eggs are laid. In many instances the o^g^ supply is exceedingly small, indeed there may be one only matured by a female. Even this may remain within the body of the parent, who simply dries up, t
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE INSECT WORLD. 125 differ by the lack of wings and the usually small size compared with the normal sexless form. Pairing takes place as soon as the female is sexually mature, and in a very few days after- wards eggs are laid. In many instances the o^g^ supply is exceedingly small, indeed there may be one only matured by a female. Even this may remain within the body of the parent, who simply dries up, the skin shrivelling around and form- ing a protection to the ovum. More usually several eggs are produced, and these of large size in proportion to the size of the insect that lays them. They are green or greenish-brown Fig. 93. Hop-louse, male; return migrant. in color when laid, sometimes yellowish, and frequently darken to black. They are placed in sheltered situations on plants, and, in the case of orchard trees, are usually found at the tips of twigs, around the buds, or on the leaf-scales, where vegetation will first start in the spring following. They are very firm in texture and very resistant to insecticides ; in fact, it is impossible to destroy them except by the most caustic mixtures. It has been already indicated that there are many exceptions to this general life his- tory, and one kind of exception we find where species feed dur-
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