American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . been the distribution of the seminalfluid into the palpal bulbs. It has been supposed that this is taken up bythe sacs, by the inflation and contraction of whose membraneous coats it isforced into the spermathecae of the female. Mr. Emerton ^ observed the pairing of the male and female of Steatoda borealis in April, and again in May. The female was in a scant web under a fence cap. The pair stood head to head, as far apart as pos- ea o a g-
American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . been the distribution of the seminalfluid into the palpal bulbs. It has been supposed that this is taken up bythe sacs, by the inflation and contraction of whose membraneous coats it isforced into the spermathecae of the female. Mr. Emerton ^ observed the pairing of the male and female of Steatoda borealis in April, and again in May. The female was in a scant web under a fence cap. The pair stood head to head, as far apart as pos- ea o a g-|^|p r^i^^ j^^^ palpus was kept in an hour and a quarter after nOVPH lie X X i i the couple were first seen. The male contracted his body sud-denlj, and swelled up the base of the palpal organ once every two or threeseconds. Two days afterwards Emerton saw the right palpus used by thesame pair for an hour. The adult males and females of this species occurat all seasons, differing in this respect from many others. II. Among the Tubeweavers I have observed the pairing of our commonSpeckled Agalena. The male cautiously approaches over the broad sheeted. Fig. 19. Agalena nsvia view. (After Emerton.) Fio. 20. Agalena nsevia applyingthe right palp in pairing. Fig. 21. Agalena appljnng theleft palp in pairing. web which forms a sort of front yard or plaza before the tube in whichthe female waits. He is usually larger than the female, and is, therefore,better able to compel a respectful reception. In the act of union^ ^ he takes his partner in his mandibles, turns her upon one side,Agalena ^ which position she lies perfectly motionless, and with herlegs somewhat doubled together, as in the attitude of feigningdeath. (Fig. 19) The male rests upon the side of the female, in a posi-tion nearly at right angles with her prostrate body, and, while holdingher still with his fore feet, apjilies the palps alternately to the vulva.(See Figs. 20, 21.) 1 New England TherididiE, Trans
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspiders, bookyear1890
