The Cambridge natural history, Vol. 04 (of 10)Warburton, Cecil
Science
The Cambridge natural history, Vol. 04 (of 10)
Warburton, Cecil
Animals
No true trap-door Spider has as yet been found in this country, but the
allied Atypidae are represented by at least one species, _Atypus
affinis_, which has been discovered in colonies in some localities in
the south of England, notably near Ventnor in the Isle of Wight, and on
Bloxworth Heath in Dorsetshire. This spider, like its continental
cousins, excavates a hole in the earth, generally near the edge of a
heathery bank, and lines it with a tube of silk of such firm texture
that it may be removed intact from the earth in which it is embedded.
The silken tube projects some two inches above the ground, either erect
among the roots of the heather, or lying loosely upon the surface. Its
extremity is always found to be closed, whether from its own elasticity
or by the deliberate act of the proprietor is uncertain, and it seems
probable that the animal spends almost the whole of its existence in the
tube. Simon believes that it feeds almost entirely upon earth-worms
which burrow into its vicinity, and which it, therefore, need not leave
its nest to catch; but the remains of beetles and earwigs have been
found in the tubes at Ventnor.
[Illustration:
FIG. 194.—Funnel of _Cyrtauchenius elongatus_. (After M‘Cook.)
]
This description of nest seems common to all species of the genus
_Atypus_. The American “Purse-web Spider,” _A. abboti_, burrows at the
foot of a tree, against the trunk of which it rears the projecting
portion of its silken tube. At the bottom of the nest the cavity is
enlarged, and blind processes project in different directions.
Another burrowing spider, _Cyrtauchenius elongatus_, surmounts its
silk-lined burrow by a funnel-shaped structure of pure white silk, about
three inches in height and two or three inches in width. There is no
attempt at concealment, and the white funnels are conspicuous among the
thin grass, presenting the appearance of fungi.
The burrowing habit is also common to the Wolf-spiders or Lycosidae, but
beyond a very slight lining of silk there is usually little spinning
work about their nests. Occasionally there is a certain amount of
superstructure in the shape of a silken funnel (_Lycosa tigrina_,
M‘Cook), or of an agglomeration of twigs and pebbles, as in the case of
the “Turret-spider” (_Lycosa arenicola_, Scudder).
[Illustration:
FIG. 195.—Turret of _Lycosa carolinensis_. (After M‘Cook.)
]
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