. 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. Spiders. 140 AMEKICAN SPIDERS AND THEIR SPINNINGWORK. spirals were thus drawn in shorter loops with much less curve, and the centre of the hub was well toward the top, two inches therefrom. In an- other adult web the orb measured eleven inches long by eight -wide, the number of radii was forty-one, of spirals forty-five, of notched concentrics nine. The centre of the hub was five inches from the topmost spiral. The following measurement
. 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. Spiders. 140 AMEKICAN SPIDERS AND THEIR SPINNINGWORK. spirals were thus drawn in shorter loops with much less curve, and the centre of the hub was well toward the top, two inches therefrom. In an- other adult web the orb measured eleven inches long by eight -wide, the number of radii was forty-one, of spirals forty-five, of notched concentrics nine. The centre of the hub was five inches from the topmost spiral. The following measurements give some idea of the size of Tri- ^®^ aranea's orb: Web No. 1, about four inches diameter; radii ments'^^ forty-three; spirals thirty-five. No. 2, radii twenty; spirals twenty. No. 3, diameter six and a half inches; radii thirty-five; spirals thirty-five. No. 4, seven inches long by six wide. No. 5, six and a half long by five and a half wide. Radii forty; spirals, forty-eight below, twelve above. No. 6, forty-one radii; forty-five spirals. No. 7, two and a half by two and a half. No. 8, eleven by eight inches, central five inches from top, three and one-fourth from side; radii forty-one, spirals forty-five, notched zone nine. Triaranea is frequently found in the neigh- borhood of human habitations, around barns and various outbuildings of farms, but also loves the field, and is frequently found therein. It does not appear to have in so marked a de- gree as Labyrinthea a preference for nest sites naked of foliage, when such can be conven- F.,;. 130. The looped spirals, , in icutly prOCUrcd. ziiia's orb. xiic mazc or snare of netted lines in the web of Triaranea is, on the whole, not quite so prominent as that of Lab- yrinthea, but in some cases it is very heavy, and generally is decidedly marked in the adult spider. The variation in this portion of Betitelar- ^^^^ ^^^^^ ^^^ ^^ ^^^^^ ^^^^^^ ^^le following extract from my note ' book, made during one day: No. 1, retitelar
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
