Archive image from page 80 of American spiders and their spinning. 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 CUbiodiversity1121211-9742 Year: 1889 ( THE ARMATURE OF ORBWEBS : VISCID SPIRALS. 81 Fig. 79. Clamping a spiral string. which the spider all the while has been rapidly approaching, and grasps it with the claws just beneath the point where the new string will cross. This then is the attitude of the spider at this point of her operations. Fig. 79. One hind foot () gras
Archive image from page 80 of American spiders and their spinning. 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 CUbiodiversity1121211-9742 Year: 1889 ( THE ARMATURE OF ORBWEBS : VISCID SPIRALS. 81 Fig. 79. Clamping a spiral string. which the spider all the while has been rapidly approaching, and grasps it with the claws just beneath the point where the new string will cross. This then is the attitude of the spider at this point of her operations. Fig. 79. One hind foot () grasps the radius near and below the point (xx) just opposite the last point of attachment. The other Paying hjd leg () is reached _, , out beyond and above the spider's abdomen, hold- ing the new string (ns) so that the two parts form an angle. Now the abdomen drops towards the radius. The raised foot lets go the stretched string at the very moment that the spinning fingers grasp the radius (at xx) and clamp tlie string there- to. The string being released at the same moment, contracts with a sudden snap, and thus forms the little interradial or jiortion of the spiral line between the two radii. Fig. 80 shows the first action in this process. The strings I I, II II, are sections of a finished spiral line, and III X III is a string in the act of being spun. The line x is caught up by the claw, cl, upon a tarsal spine, ts, (apparently) or a metatarsal spine, ms, and pulled out from the abdomen to which it is attached by ab. The foot (here greatly exaggerated) moves rap- idlj' towards ab, and the line is fastened at the point III, indicated on the right hand radius, r. The large tarsal spines which arm the terminus of the tarsus of Argiope coph- inaria are continually used by that species to hold the beaded string as it is thus drawn out. In the meantime, of course, the remaining limbs of the spider have been carrying her forward. The The iggg Qj Y\e side towards the cen- Proeress
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