. 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. GENERAL COCOONINO HABITS OF SPIDISKS. 139 That accomplished Frencli arachiiologist, M. Eugene Simon, has recently added largely to our knowledge of this interesting tribe. A visit to South America enabled him to make personal studies of trapdoor nests, bimon on ^^^^^j these have ha])pily fo\nid expression in admirably drawn Spiders p'iitos, some of whose figures I have veiitured to redraw for these pages. Rhytidicolus structor
. 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. GENERAL COCOONINO HABITS OF SPIDISKS. 139 That accomplished Frencli arachiiologist, M. Eugene Simon, has recently added largely to our knowledge of this interesting tribe. A visit to South America enabled him to make personal studies of trapdoor nests, bimon on ^^^^^j these have ha])pily fo\nid expression in admirably drawn Spiders p'iitos, some of whose figures I have veiitured to redraw for these pages. Rhytidicolus structor is a common species in Venezuela, particularly upon the slopes of compact and sandy ground. Its burrow is the most complex that Simon It is composed of three successive spacious chambers, connnunicating one with another bj' straight openings, which close by a hinged door. The first chamber is largely dilated in the form of a pear, but quite contracted at the two extremities. (See Fig. 17(|.) The second chandjcr is more or less cylindrical, and termi- nates in a cul de sac. The third chamber communicates with the sec- ond, not by its extremity, but upon the side, which is dilated and oval, like the first, and rounded at the bot- tom. The walls of the entire burrow are perfectly built, very smooth, and draped with a white tissue, light, transparent, and adhering. The three doors are almost alike. They are th4ck, cut like a stopi)le upon the edge, and penetrate within the opening, which is itself slightly widened and a little prolonged beyond the surface. They are semicircular, and cut in a straight line on the side of the liinge. Their superior faces are rough, like the adjoining soil, even with the in- side doors; sometimes at an external opening the doors are a little swollen, and very unequal, but always slightly concave on the internal doors. The internal faces of the doors are convex, and have a silk drapery like that of the walls. On the edge of the bevel are sma
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
