American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . .The silken rug on which our greatTarantula rests, the tube of thePurseweb spider, etc., are almostcertainly woven precisely as is thecocoon of those sisecies; and, if so. Fig. 203. Agalenanasvia engaged in covering her eggs; ^^q TunuelweaverS Spin their CO-use of the long spinnerets. coons as do other to the Wanderers, we have in the case of the Lycosids an ex-ami)le, to which I have heretofore referred (Vol. II., ymge 144),
American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . .The silken rug on which our greatTarantula rests, the tube of thePurseweb spider, etc., are almostcertainly woven precisely as is thecocoon of those sisecies; and, if so. Fig. 203. Agalenanasvia engaged in covering her eggs; ^^q TunuelweaverS Spin their CO-use of the long spinnerets. coons as do other to the Wanderers, we have in the case of the Lycosids an ex-ami)le, to which I have heretofore referred (Vol. II., ymge 144), of the man-ner in which Lycosa fabricates her round cocoon. She firstweaves a circular patch, which she afterwards forms into a hol-low sphere surrounding her eggs. The mode of equalizing the spinningthread is as follows : The feet clasped the circumference of the cushion,and the body of the animal was slowly revolved. The abdomen, greatlyreduced in size by the extrusion of the eggs, was lifted up, thus drawingout short loops of silk from the extended spinnerets, which, when theabdomen was dropped again, contracted and left a flossy curl of silk at. Lycosa. COMPAKATIVE COCOONING INDUSTRIES. 167 the point of attacliment. The abdomen was also swayed from one side toaiiotiier, tlie tilanients from the spinnerets following the motion as thespider turned ; and thus an even thickness of silk was laid uiion the same behavior marked the spinning of the silken rug or cushion inthe middle of which the eggs had been deposited. It will thus be seenthat the entire process of forming a cocoon, as wrought by Lycosa, resem-bles in every jiarticular the mode practiced l^y Tubeweavers and substan-tially by Orbweavers. So also is it with the Saltigrades. I have observed Pliidippus rufusspinning its cocoon, and she proceeds after the same general method. A Salti- grade mother is represented at Fig. 205, as sketched in the actSalti- ^£ cocoon making. The diverging lines of silken spinnin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspiders, bookyear1890
