. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. 34 AMERICAN SPIDERS AND THEIR Sl'INNlNGWORK. the differences. He calls attention to the fact that Cteniza's door consists of a series of superimposed layers of silk and mud, amounting sometimes to thirty,1 is thick, of equal width, and beveled at the edge; while Opifex makes a thin door composed of a single layer of silk and soil, much thicker in front, and with unbeveled edge. The hinge of the former is also tough and elastic,
. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. 34 AMERICAN SPIDERS AND THEIR Sl'INNlNGWORK. the differences. He calls attention to the fact that Cteniza's door consists of a series of superimposed layers of silk and mud, amounting sometimes to thirty,1 is thick, of equal width, and beveled at the edge; while Opifex makes a thin door composed of a single layer of silk and soil, much thicker in front, and with unbeveled edge. The hinge of the former is also tough and elastic, while the latter is feeble and with little elasticity. All this is true, but Mr. Wagner appears to have lost sight of the fact that the Ter- ritelarise embrace many species besides Nemesia and Cteniza whose indus- try is greatly varied in form, and furnishes examples much nearer that of Wagner's species than the one with which he compares it. Moggridge has called attention to these in that form of trapdoor which he calls the "wafer" type as distinguished from the "cork" The latter is the form with which alone Mr. Wagner appears to have been familiar, while the former more closely resembles his own interesting discovery. The eminent French araneologist, M. Eugene Simon, has added greatly to our knowledge of these aranead architects, and I have quoted freely3. Comparative view ot Lyoosid auchitectvire Fig. 28. Lycosa scutulata, simple burrow in the ground; a temporary closure for moulting and cocoon- ing. Fig. 29. Funnel shaped tube of silk, more or less supported and disguised by vegetable foliage and debris; Lycosa tigrina. Fig. 30. Turret of silk protected by armor of twigs or grass bits ; Lycosa arenicola. Fig. 31. Vestibule of silk, armored with moss, etc., with a rude door, Lycosa tigrina. FIG. 82. Silk lined burrow, with wafer trapdoor at surface; Tarentula opifex. from his papers and given a number of illustrations exhibiting the appar- ent dev
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
