. A manual for the study of insects. Insects. 166 THE STUDY OF INSECTS, poisonous gas (hydrocyanic-acid gas) is generated within the tent. A number of useful insects belong to this family. Several species furnish dye-stuffs. The best known of these is Coccus cacti, the dried bodies of which are known as Cochi- neal. The stick lac of commerce, from which shell-lac or shellac is prepared, is a resinous substance excreted by a species, Carteria lacca (Car-ter'i-a lac'ca), which lives on the young branches of several tropical trees, and the bodies of these insects, which are obtained from the stic
. A manual for the study of insects. Insects. 166 THE STUDY OF INSECTS, poisonous gas (hydrocyanic-acid gas) is generated within the tent. A number of useful insects belong to this family. Several species furnish dye-stuffs. The best known of these is Coccus cacti, the dried bodies of which are known as Cochi- neal. The stick lac of commerce, from which shell-lac or shellac is prepared, is a resinous substance excreted by a species, Carteria lacca (Car-ter'i-a lac'ca), which lives on the young branches of several tropical trees, and the bodies of these insects, which are obtained from the stick lac, furnish the coloring agents known as lac dye. China wax is another substance for which we are indebted to this family, ^t is the excretion of an insect known as Pe-la, Ericeriis pe-la (E-ri- ce'rus). In fact many species of this family excrete wax in considerable quantities. Among the more prominent members of this family are the following: The Cottony-cushion Scale, Icerya purchasi (I-ce'ry-a pur^cha-si).—This beautiful in sect (Fig. 203) was at one time the most dangerous insect pest in California, and did a great amount of injury. It is an introduced Australian spe- cies, and has been subdued to a great 'extent by the intro- duction of an Australian Lady- bug, F^<^<^/2<2(Ve-da''li-a), which preys upon it. The body of the adult female is scale-like, dark orange-red, and has the dorsal surface more or less Y\G. :to2,.—Iceryapnrchasi Females, adult cOVercd with a wllite Or yel- and young, on orange. (From the Author's ^ -^ ^ Reportfori88o.) lowish-white powder. The in- sect secretes a large egg-sac, which is beautifully ribbed. The Mealy-bugs, Dactylopius (Dac-ty-lo'pi-us).—The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 185
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
