. 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. 318 ameri(;an spiders and their spinningwouk. has no chitinous extension covering the abdominal union. In the female of this si>ecies, unlike Guttata, there is no truce of these organs. Of course, any sounds which might be produced by the organs thus described, must be occasioned by the flexion and extension of the two principal parts of the body; that is to say, by the drawing back (3°^ â , and forward, within the socket,
. 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. 318 ameri(;an spiders and their spinningwouk. has no chitinous extension covering the abdominal union. In the female of this si>ecies, unlike Guttata, there is no truce of these organs. Of course, any sounds which might be produced by the organs thus described, must be occasioned by the flexion and extension of the two principal parts of the body; that is to say, by the drawing back (3°^ â , and forward, within the socket, of the cartilaginous pedicle which are Made connects the thorax with the abdomen. But Mr. Campbell has also discovered an apparatus which he ventures to call stridu- lating, seated on the falces and palps in both sexes of Linyphia tene- brosus. ^ These are of a different structure from those heretofore described. On the outer side of the basal joint of each falx are about twenty parallel transverse chitinous bands, placed so that their inferior edges are free. (Fig. 301.) The effect, when viewed from the front, is that each falx has a distinctly serrated outer edge, which becomes more and more decided towards Fl«.302. ^jjg ]^^gg_ yphia tenebricoia, male, The opposing sui'facc is that of tlic humcral joint viewcrt obliquely from the ^f ^j^pij ^s (Fig. 302), whicli is marked with a right side. Km. 302. Hu- ' ^ v t. /' merai joint of lea palp, morc or Icss regular series of curved grooves deep insiinior^r^ndtt t': e»«"gl^ to give the appearance of serration on its side top the horny plate. (Af- Under a two-tliird objcctive. On the under side of this *"""' ^ '' joint, close to its base, is a curved enlargement, and on the top a prominent, horny, somewhat triangular, knob like plate, with a rounded apex. This differs in form, size, elevation, and position from the chitinous prominences usually seen in connection with spines, of which the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
