The Structure and Habits of SpidersEmerton, J. H. (James Henry)
Science
The Structure and Habits of Spiders
Emerton, J. H. (James Henry)
Spiders
The female _Drassus_, Fig. 56, spins a little web A across her nest,
and drops the eggs E on it, as in the figure. They are soft, and mixed
with liquid, and are discharged in one or two drops, like jelly. They
quickly soak up the liquid, and become dry on the surface, sometimes
adhering slightly together.
After the eggs are laid, the spider covers them with silk, drawing the
threads over them from one side to the other, and fastening them to the
edges of the web below. When the covering is complete, she bites off
the threads that hold the cocoon to the nest, and finishes off the
edges with her jaws.
The _Lycosidæ_ make their cocoons in the same way, but rounder, and
showing only slightly the seam where the upper part was attached to the
lower.
[Illustration: Fig. 57.]
[Illustration: Fig. 58.]
The _Lycosas_ carry their cocoons about, attached to the spinnerets, as
in Fig. 57, bumping them over the stones without injury to the young
inside.
Many spiders make their cocoons against a flat surface, where they
remain attached by one side. _Attus mystaceus_ spins, before laying,
a thick nest of white silk on the under side of a stone. In this she
thickens a circular patch on the upper side, next the stone, and
discharges her eggs upward against it, Fig. 58. They adhere, and are
covered with white silk. I once had a spider of this species lay her
eggs, in confinement, in a nest the under side of which had been cut
away. Instead of completing the cocoon properly, she ate the eggs
immediately after laying. _Epeira strix_ spins, before laying, a bunch
of loose silk, Fig. 59. She touches her spinnerets, as in the figure on
the left, draws them away a short distance, at the same time pressing
upward with the hind-feet, as in the figure on the right; then moves the
abdomen a little sidewise, and attaches the band of threads so as to
form a loop. She keeps making these loops, turning round, at the same
time, so as to form a rounded bunch of them, into the middle of which
she afterwards lays the eggs, as in Fig. 60. The eggs, which are like
a drop of jelly, are held up by the loose threads till the spider has
time to spin under them a covering of stronger silk. _Epeira vulgaris_
makes a similar cocoon upward, downward, or sidewise, as may be most
convenient.
[Illustration: Fig. 59.]
[Illustration: Fig. 60.]
Most of the _Theridiidæ_ make cocoons of loose silk, held up in the web
by numerous threads. Some hang the cocoon by a stem, Fig. 61.
The large species of _Argiope_ makes a big pear-shaped cocoon hanging
in grass or bushes, Fig. 62. A stem of loose brown silk is first made,
and under this the eggs attached (at any rate this had been done in one
which had been abandoned unfinished); then a cup-shaped piece is made
under the eggs; the bunch of loose silk is spun over all, and finally
the paper-like shell.
[Illustration: Fig. 61.]
[Illustration: Fig. 62.]
ESCAPE FROM THE COCOON.
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