Archive image from page 414 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 ( ENEMIES AND THEIR INFLUENCE. 405 At one time twenty-eight of these spiders were kept under observation in the observei''s grounds. She visited them all frequently and found that more than half the number, both males and females, had closed their doors firmly. Some of the burrows were situated in bits of moss, and the moss was so cun
Archive image from page 414 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 ( ENEMIES AND THEIR INFLUENCE. 405 At one time twenty-eight of these spiders were kept under observation in the observei''s grounds. She visited them all frequently and found that more than half the number, both males and females, had closed their doors firmly. Some of the burrows were situated in bits of moss, and the moss was so cunningly arranged over them that the most expert naturalist would have found it difficult to tell where they were located. Mrs. Treat had often tested the matter with her friends, to see if they could find one of these concealed burrows, limiting their search to a few square inches of space. But they i-arely hit upon the right spot. Mrs. Treat kindly con- tributed some of the coverings of these Tigrina burrows to my collection Fig. 310. A vestibule ami dome of vegetable debris reared over the burrow of Lycosa tigrina. Natural size. (From a cabinet specimen.) of aranead architecture. They are masses of vegetable debris, moss, grass blades, chippage, dry twigs, the shell of an acorn, etc., arranged in an irregular dome several inches in diameter across the base and an inch or more in height. (See Fig. 340 and Figs. 341, 342.) What is the explanation of tliis care shown by Tigrina in the covering of its den in midsummer? The closure in winter is explained nlanation natural desire to protect the burrow from frost and snow. The closure during or previous to the moulting season is explained by the fact that the spider requires especial protection at a period
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