. Elements of zoölogy. Zoology. INSECTS. Ill its prey ; the Argyronetra aquatica lives in air-bubbles under water; and the Attus volans of Australia has flaps or wing-like extensions of the abdomen, that it elevates or depresses during leaps from plant to plant. The egg-sacs (Fig. 132, a) are sometimes attached to the webs, carried about by the mother, or affixed to stalks (Fig. 132, b), and re- semble small plants. Value.—Spiders are useful in destroying other noxious insects. The silk is of value to opticians as cross-lines in optical instruments, also as a mechanical styptic. The silk of ce
. Elements of zoölogy. Zoology. INSECTS. Ill its prey ; the Argyronetra aquatica lives in air-bubbles under water; and the Attus volans of Australia has flaps or wing-like extensions of the abdomen, that it elevates or depresses during leaps from plant to plant. The egg-sacs (Fig. 132, a) are sometimes attached to the webs, carried about by the mother, or affixed to stalks (Fig. 132, b), and re- semble small plants. Value.—Spiders are useful in destroying other noxious insects. The silk is of value to opticians as cross-lines in optical instruments, also as a mechanical styptic. The silk of certain spiders has been woven. One of the kings of France possessed a coat made of this silk. In Bermuda the silk of Nephila has been used as sewing-silk. Works on Spiders for farther reference. " Structure and Habits of Spiders," J. H. Emerton ; " Harvesting Ants and Trap-door Spiders," J. T. Moggridge ; "The Triangle Spi- der," B. G. Wilder, "Popular Science Monthly," 1875; "Practical Use of Spider-Silk," B. G. Wilder, the " Galaxy," July, 1869 ; " Pedi- palpi of North America," H. C. Wood, Jr., "Journal of Philadelphia Academy of Natural Science," vol. v ; " Mites, Ticks, and other Aca- ri," "Popular Science Monthly," vol. xiv ; " Termayer's Researches on Spiders' Silk," "Proceedings of Essex Institute," vol. v; " Pha- langerae of the United States," H. C. Wood, Jr., " Proceedings of Essex Institute," vol. vi; " Harper's Monthly," vol. lx, Treat. Packard's " Guide to the Study of ; Sub-Class IV.—Six-Legged Insects (Ifexapcda). General Characteristics.—The Hexapods have antennae and two pairs of jaws or FlG. 133.—Glacier-flea {Desoria glacialis). Order I. Spring-Tails \JTAysanura).—The spring- tails are minute wingless forrn^yhat possess a forked spring,. Please note that these images are e
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
