. 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. COMPARATIVE COCOONING INDUSTRIES. 167. the point of attachment. The ahdomen was also swayed from cue side to another, tlie filaments from the spinnerets following the motion as the spider turned ; and thus an even thickness of silk was laid upon the eggs. The same hehavior marked the spinning of the silken rug or cushion in the middle of which the eggs had been deposited. It will thus be seen that the entire process of forming
. 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. COMPARATIVE COCOONING INDUSTRIES. 167. the point of attachment. The ahdomen was also swayed from cue side to another, tlie filaments from the spinnerets following the motion as the spider turned ; and thus an even thickness of silk was laid upon the eggs. The same hehavior marked the spinning of the silken rug or cushion in the middle of which the eggs had been deposited. It will thus be seen that the entire process of forming a cocoon, as wrought by Lycosa, resem- bles in every particular the mode practiced by Tubeweavers and substan- tially by Orbweavers. So also is it with the Saltigrades. I have observed Phidippus rufus spinning its cocoon, and she proceeds after the same general method. A Salti- , grade mother is represented at Fig. 20^, as sketched in the act ^^^^^" of cocoon making. The diverging lin6s of silken spinning stuff gra es. _^^^ \:\^qxq seen proceeding from the spinnerets, while the abdomen is lifted up at a considerable incline, and the feet clasp the borders of the cocoon. As this Phidippus revolved she alternately dropped and elevated the abdomen, while the silken loops thus formed curled down into the mass already spun and were further beaten in by the spinnerets and legs. It thus appears from personal observation of typi- cal species in all the tribes, with the exception of the Laterigrades, that the manner of outputting the spinning stuff while weaving cocoons is prac- tically the same. The only difference observable is confined to the use of the spinnerets in beating fig. 2m. Phidippus rufus spin ., , ,1 1 11 V, â nine her cocoon cover. down the outspun threads, these organs bemg more freely used for this purpose among the Tubeweavers and Tunnel- weavers, who possess long pairs of superior spinnerets, than among others. III. Proceeding now to a comparative study of the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
