The Common Spiders of the United StatesEmerton, J. H. (James Henry)
Science
The Common Spiders of the United States
Emerton, J. H. (James Henry)
Spiders -- United States
In beginning a web, after the radiating threads are finished, the spider
fastens them more firmly at the center and corrects the distances
between them by several short, irregular threads (fig. 379) and then
begins the inner spiral with the turns, at first close together and then
widening, in some species gradually, in others suddenly, until they are
as far apart as the spider can reach with the spinnerets on one and the
front feet on the next, and so goes on nearly to the outside of the web,
where it stops abruptly (fig. 381). The spider usually rests a moment
and then begins, sometimes at another part of the web, the outer sticky
spiral. In the outermost parts of the web it usually forms several loops
(fig. 381, _b_ to _f_), filling in the corners until it approaches the
inner spiral and finds room to pass completely around the web. As soon
as the inner spiral is found in the way a part of it is cut out, and by
the time the outer spiral is finished the inner is reduced to the small
and close portion near the center.
[Illustration: FIG. 381. Unfinished web of Epeira sclopetaria showing
the completed inner spiral ending at _a_. The outer spiral began at _b_,
went to _c_, and returned to _d_; turned and went to _e_, and then to
_f_; and from there nearly around the web to _g_. From _g_ it returned
to the lower part of the web and made loops at _i_ and _j_, and then
started around the web until it was stopped at _k_.]
While the temporary spirals are made as far apart as possible, the
threads of the outer spiral are placed as close together as they can be
without danger of their sticking to each other, and usually a little
closer together toward the center of the web than they are at the
outside. In fastening this thread to the rays of the web the spider
first feels for the last thread with the first and second feet, and,
having found it, turns the body slightly around and grasps the ray with
the nearest foot of the fourth pair at a short distance from the point
where the last thread crosses. After taking hold of the ray with the
fourth foot, the spider turns down the abdomen so as to place the
spinnerets against the ray and fastens the thread to it, at the same
time holding the thread off with the other fourth foot to prevent its
sticking to anything around it. The whole making of the web seems to be
done entirely by feeling and is done as well in the dark as in daylight.
When the spider is active and the food supply good, a fresh web is made
every day, the old one being torn down and thrown away. In tearing down
a web (fig. 382) the spider walks out from the center on one of the rays
and gathers in what web he can reach with the front feet, chews it into
a ball, and drops it; then, having put in new rays in the cleared space,
he goes to another part of the web and tears down another piece.
Public-domain text, read in full here on John Shaqi.
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