. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. TIIYSANURA. 553 A Locustidce, at the base of the anterior wings. Both sexes of the Acr id idee also produce similar though feebler chirping sounds, by rubbing the femora of the posterior legs against the edge of the wing- covers. Insects are almost universally distributed, from the equator to the extreme limits of vegetation; certainly Avith a considerable diminu- tion in the number of species, and in their size and beauty of colour. Some forms are truly cosmopolitan, , Vanessa cardui.
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. TIIYSANURA. 553 A Locustidce, at the base of the anterior wings. Both sexes of the Acr id idee also produce similar though feebler chirping sounds, by rubbing the femora of the posterior legs against the edge of the wing- covers. Insects are almost universally distributed, from the equator to the extreme limits of vegetation; certainly Avith a considerable diminu- tion in the number of species, and in their size and beauty of colour. Some forms are truly cosmopolitan, , Vanessa cardui. Fossil insects are found in increasing numbers of species, from the car- boniferous formation to the tertiary period. The best preserved are those enclosed in amber and the impressions in the lithographic slate. Order I.—THYSANURA * (including COLLEJI- BOLA). Wingless insects, with hairy or scaly body cover- ing ; with rudimentary masticating mouth parts and setiform anal fila- ments, which may serve as a springing appara- tus, at the end of the ten-segmented abdomen. Development without metamorphosis. The Tlnjsanura seem to have preserved most completely the primitive character of the oldest insect forms. The elongated Campodido} particularly recall certain Myriapods, especially since they may have rudimentary feet on the abdomen (fig:. 459, a, b). On this account the Campodidce have been regarded as ancestral. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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