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Updated: June 19, 2025
Now and then we passed over the tracks of the leaf-cutting ants, who were hurrying along as usual, laden with pieces of foliage about the size of a sixpence. There were but few birds, and insects also were scarce, the bleak wet weather doubtless being unsuitable for them.
With a final, long, descending curve, it alighted in the compound of our bungalow laboratory and rested quietly a great queen of the leaf-cutting Attas returning from her marriage flight. After a few minutes she stirred, walked a few steps, cleaned her antennæ, and searched nervously about on the sand.
The leaf-cutting ants attacked the young plants, and defoliated them, but I have never seen any of the trees out on the savannahs that are guarded by the Pseudomyrma touched by them, and have no doubt the acacia is protected from them by its little warriors.
Although they can bite ferociously, they are too small to cut through leaves, and they have very definite duties in the nest; yet they are found with every leaf-cutting gang, hastening along with their larger brethren, but never doing anything, that I could detect, at their journey's end.
In the driver ant of West Africa one kind of neuter is three times the size of the other, and has jaws nearly five times as long. In another case "the workers of one caste alone carry a wonderful sort of shield on their heads." One of the three neuter classes in the leaf-cutting ants has a single eye in the midst of its forehead.
I shall conclude this long account of the leaf-cutting ants with an instance of their reasoning powers. A nest was made near one of our tramways, and to get to the trees the ants had to cross the rails, over which the waggons were continually passing and repassing. Every time they came along a number of ants were crushed to death.
Shovel gangs, track gangs, surfacing gangs, dynamite gangs, gangs doing everything imaginable with shovel and pick and crowbar, gangs down on the floor of the canal, gangs far up the steep walls of cut rock, gangs stretching away in either direction till those far off look like upright bands of the leaf-cutting ants of Panamanian jungles; gangs nearly all, whatever their nationality, in the blue shirts and khaki trousers of the Zone commissary, giving a peculiar color scheme to all the scene.
Whilst the leaf-cutting ants are entirely vegetable feeders, the foraging ants are hunters, and live solely on insects or other prey; and it is a curious analogy that, like the hunting races of mankind, they have to change their hunting-grounds when one is exhausted, and move on to another. In Nicaragua they are generally called "Army Ants."
In some parts brown tiger beetles ran or flew with great swiftness; in others, leaf-cutting ants in endless trains carried aloft their burdens of foliage, looking as they marched along with the segments of leaves, held up vertically, like green butterflies, or a mimic representation of a moving Birnam wood.
Some trees are not touched by the ants. Foreign trees are very subject to their attack. Method of destroying the ants. Migration of the ants from a nest attacked. Corrosive sublimate causes a sort of madness amongst them. Indian plan of preventing them ascending young trees. Leaf-cutting ants are fungus-growers and eaters. Sagacity of the ants.
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