American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . rs known to me to habitually construct a stringor cluster of egg sacs. These species represent groups having well defineddifferences in structure and decided differences in the characteristics oftheir snares. The genus Cyrtarachne is remarkable by the peculiar form of the body,and is distributed cjuite extensively throughout the United States. There are probably two species, the Bisaccata of Emertou and Corni-Cyrta- ^^^.^ ^f jjentz. The coc
American spiders and their spinningworkA natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . rs known to me to habitually construct a stringor cluster of egg sacs. These species represent groups having well defineddifferences in structure and decided differences in the characteristics oftheir snares. The genus Cyrtarachne is remarkable by the peculiar form of the body,and is distributed cjuite extensively throughout the United States. There are probably two species, the Bisaccata of Emertou and Corni-Cyrta- ^^^.^ ^f jjentz. The cocoon made by the two species is similarrachne .^ general form, but there appears to be a marked difference inthe mode of attachment. Moreover, Cornigera apparently spinsV)ut one cocoon, while Bisaccata, as its name implies, spins at least two;and I have had cocoon strings sent me from California by Mrs. Eigen-mann containing three. Thus Emertons specific name appears to be amisnomer. I have a number of specimens; one collected by Dr. Marx 1 Staveley, British Spiders, page 208. ^ Aptures, Aol. II., page 207. 96 AMERICAN SPIDERS AND THEIR
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspiders, bookyear1890
