Plate I., p. 21, fig. A.--View of the entrance to a nest of _Atta
barbara_, showing part of a train of ants bearing seeds, the
conical mound of refuse thrown out, and some seedlings, which
have sprung up from seeds accidentally dropped by the ants; B,
one of the larger workers of this species, of the natural size,
and B 1, its abdomen and pedicle, with two nodes, magnified; C*,
one of the smaller workers, of the natural size; C, a male, of
the natural size; D, a female, of the natural size; D 1, wing of
the same, magnified; D 2, mouth organs of the same, magnified,
with the mandibles removed, the two outer pieces being the
maxillæ and their palpi, and the lozenge-shaped piece the labium,
from the upper part of which the labial palpi spring, while
behind the labium is the true tongue; D 3, one of the mandibles,
magnified; E, a larva, of the natural size, and E 1, the same,
magnified.
Plate II., p. 22, fig. A.--A trowel containing earth, in which a
granary full of seeds is lying almost undisturbed, of the natural
size; B, the crater-like entrances found at the mouths of the
nests of _Atta structor_, reduced to one-half the natural size.
Plate III., p. 23.--The floors of three granaries of _Atta
barbara_, surrounded by the much coarser gravelly earth, of the
natural size.
Plate IV., p. 31.--A mass of earth pierced by roots, in which the
ants (_Atta barbara_) have made their granaries and galleries.
The galleries were full of seeds when first laid open. Of the
natural size.
Plate V., p. 33, fig. A.--Galleries and terminal cells of a nest of
_Atta barbara_, excavated in the living sandstone rock, drawn _in
situ_, of the natural size; B, part of a cylindrical gallery from
another rock-nest, and B 1, the same gallery seen in front, of
the natural size.
Plate VI., p. 35, fig. A.--A sprouting hemp-seed, part of the
radicle of which has been gnawed by the ants, of the natural
size; A 1, the same, magnified, _rad._ radicle; A 2, an entire
sprouting seed of the same, magnified; B, a sprouting pea, part
of the radicle of which has been gnawed off; B 1, the same,
magnified; B 2, the same stripped of its coat, and showing the
two seed leaves; C, a sprouting "canary-seed" (the grain of
_Phalaris canariensis_), part of the fibril of which has been
gnawed off; C 1, the same, magnified, _rad._ the radicle which
remains undeveloped, and _fib._ the fibril or first rootlet; C
2, an unmutilated sprouting "canary seed;" D, a mass of earth
taken out of the heart of a nest of _Atta barbara_, in which a
spherical cell, made of hardened earth, was buried. It contained
grass seeds, among which I found ants at work, and seeds of the
same grass still in their husks lay in the gallery leading up to
the entrance of this cell; D 1, the same, further freed from the
earth, and having part of one side removed, so as to show the
interior and the small lower opening leading out from the bottom
of the cell.