Archive image from page 401 of American spiders and their spinning. 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 CUbiodiversity1121211-9810 Year: 1889 ( 392 AMERICAN SPIDERS AND THEIR SPINNINGWOKK. measures one-third of an inch in length and one-tenth in diameter. It is of an oblong quadrilateral figure ta])ering to its extremities, one of which is more pointed than the other. It is lashed to its site by numer- 'ous fine silken lines. In about one month the perfect insect appears. B
Archive image from page 401 of American spiders and their spinning. 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 CUbiodiversity1121211-9810 Year: 1889 ( 392 AMERICAN SPIDERS AND THEIR SPINNINGWOKK. measures one-third of an inch in length and one-tenth in diameter. It is of an oblong quadrilateral figure ta])ering to its extremities, one of which is more pointed than the other. It is lashed to its site by numer- 'ous fine silken lines. In about one month the perfect insect appears. Blackwall found this parasite on four species of Epeira and two of Liny- phia. The same author figures Hermeteles fasciatus and H. formosus, ichneumon parasites on Agalena brunnea. A correspondent of 'Science Gossip' gives an interesting note with draw- ings of an ichneumon wasp larva that preys upon a small spider in Cey- lon, India. The spider usually attacked is a small black ani- Parasite '' ' globose abdomen, that spins a loose irregular web on the under surface of leaves. The ichneumon wasp appears to upon female spiders only, the males being much smaller and unable to sulport the wasp grub. The egg is fixed to the abdomen of the spider close to its junction with the cephalothorax. The newly hatched larva immediately pierces the skin, and commences to absorb the juices of its The spider continues to feed, and re- mains apparently in good health until the parasite is full grown, when the latter destroys its victim, leaving nothing but the empty skin. The larva then commences to spin a flask shaped silken cocoon, at- tached generally to the under side of a cinchona leaf. It builds up the cocoon gradually, complet- ::.Zy7,t:. 'g e waHs as it proceeds, forming first a cup shaped receptacle, which is lengthened by regular additions to the open edge, and finally closed. A specimen under observa- tion completed its work in forty-eight hours. It is an inter
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