Harvesting Ants and Trap-Door Spiders: Notes and Observations on Their Habits and DwellingsMoggridge, John Traherne
Science
Harvesting Ants and Trap-Door Spiders: Notes and Observations on Their Habits and Dwellings
Moggridge, John Traherne
Ants; Trap-door spiders
It is not a little surprising to see that the ants bring in not
only seeds of large size and fallen grain, but also green capsules,
the torn stalks of which show that they have been freshly gathered
from the plant. The manner in which they accomplish this feat
is as follows. An ant ascends the stem of a fruiting plant, of
Shepherd's-purse (_Capsella Bursa pastoris_) let us say, and
selects a well-filled but green pod about midway up the stem, those
below being ready to shed their seeds at a touch. Then, seizing
it in its jaws, and fixing its hind legs firmly as a pivot, it
contrives to turn round and round, and so strain the fibres of the
fruit-stalk that at length they snap. It then descends the stem,
patiently backing and turning upwards again as often as the clumsy
and disproportionate burden becomes wedged between the thickly set
stalks, and joins the line of its companions on their way to the
nest. In this manner capsules of chickweed (_Alsine media_) and
entire calyces, containing the nutlets of Calaminth, are gathered;
two ants also sometimes combine their efforts, when one stations
itself near the base of the peduncle and gnaws it at the point of
greatest tension, while the other hauls upon and twists it. I have
never seen a capsule severed from its stalk by cutting alone, and
the mandibles of this ant are perhaps incompetent to perform such a
task. I have occasionally seen ants engaged in cutting the capsules
of certain plants drop them and allow their companions below to carry
them away; and this corresponds with the curious account given by
Ælian[25] of the manner in which the spikelets of corn are severed
and thrown down "to the people below," [Greek: tô dêmô tô katô] τω
δἡμω κἁτω.
[Footnote 25: Vide supra, p. 8.]
If the incoming and weight-carrying column of ants be closely
examined it will be found that though the great majority of workers
are bringing seeds in some form to the nest, a few are burdened with
other and more miscellaneous materials.
Occasionally one or two may be detected carrying a dead insect, or
crushed land-shell, the corolla of a flower, a fragment of stick, or
leaf, but I have never seen aphides brought in to the nest or visited
by this ant or by _Atta structor_.
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