American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . e, in some cases, a number opened, from which also they escaped when the cocoon was agitated. Similar openings havefrequently been observed in the cocoons of Argiope cophinaria, Epeiracornigera, Argyrodes trigonum, and in numerous examples of Epeiroid,Tubitelarian, and Laterigrade cocoons. In these, however, as a rule, therewas only one opening, but sometimes two. Professor Wilder has recorded some facts upon this point.^ Cocoonsof the Bask
American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . e, in some cases, a number opened, from which also they escaped when the cocoon was agitated. Similar openings havefrequently been observed in the cocoons of Argiope cophinaria, Epeiracornigera, Argyrodes trigonum, and in numerous examples of Epeiroid,Tubitelarian, and Laterigrade cocoons. In these, however, as a rule, therewas only one opening, but sometimes two. Professor Wilder has recorded some facts upon this point.^ Cocoonsof the Basket Argiope kept by him in South Carolina were never seen tobe pierced by the inmates. Of four hundred and six cocoonsobtained on James Island in the spring of 1865, only one hun-dred and thirty-four Avere entire, presenting no opening what-ever. Of the others one hundred and ninety were pierced whenfound, but no spiders came out of these before May 10th. Theopenings in them were similar to that made in a New York cocoon June14th, by the inmates themselves. This hole was near the pedicle or stem of the C0C0041, and from it Fig. 242. Fig. 243. Drassid cocoons, to show the openings out of which the younghave 242. Front view. Fig. 243. Side view. the young escaped. Of theremaining eighty-two co-coons fifty-nine were tornin one or more places, andloose silk jiroceeded throughthe rents. Professor Wilderonce .saw a little bird, aboutthe size of a sparrow, flyat a cocoon hanging in a tree, make one or two quick pulls and then re-treat. He is therefore inclined to think that all the above rents were socaused; and, as these attacks would usually open the cocoon without in-juring the inmates, he drew the inference that this might be a provisionof Nature, somewhat like the fertilization of flowers by insects, by wliichthe invasion of the cocoon should really permit the continuance of thespecies. There may be some ground for this inference, but it i
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspiders, bookyear1890
