American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . idened and alittle prolonged beyond the are semicircular, and cut in astraight line on the side of the superior faces are rough, likethe adjoining soil, even with the in-side doors; sometimes at an externalopening the doors are a little swollen,and very unequal, but always slightly concave on the internal doors. Theinternal faces of the doors are convex, and have a silk drapery like thatof the walls. On the edge of
American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . idened and alittle prolonged beyond the are semicircular, and cut in astraight line on the side of the superior faces are rough, likethe adjoining soil, even with the in-side doors; sometimes at an externalopening the doors are a little swollen,and very unequal, but always slightly concave on the internal doors. Theinternal faces of the doors are convex, and have a silk drapery like thatof the walls. On the edge of the bevel are small holes for the attachmentof the claws when the traj) is to be held down, and these are more distincton the entrance door. This swings naturally from within to the out-side. The second door opens, on the contrary, from the outside inwardlyin such manner that in the first chamber the two doors show the inter-nal faces equally smootli. The arrangement of these doors is shown inthe figure. The female deposits her eggs in the first chamber; they arc not agglu-tinated, and are enveloped in a cocoon of white, opaijue tissue, nuich longer. Fni. 170. .Section in tlit earth, sliowing trapdoornest of the female Rhytidicolus structor. (.\fterSimon.) Fici. 171. Outline of first chamber ofRhjtidicolus structor, to sliow location of cocoon. 140 AMERICAN SPIDEKS AND THEIR SPINNINGWORK. Burrowand Co-coon ofPsalis-tops. than large, and are suspended obliquely, like a hammock, between the op-jiosite walls, as shown in the outline sketch. Fig. 171. Among the Venezuelan Avicularidse Simon discovered and describes aninteresting species, which he names Psalistops melanophygia. It is a com-mon species in the neigliboihood of Caracas, particularly in theforest of Catuche. It digs a burrow in the ground six or seveninches in depth, garnished toward the top with a silken liningslightly adherent. The burrow is quite straight in the upperpart, from which proceeds a simple branch, straigh
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspiders, bookyear1890
