interfere with the continuation of the species. This appears to be a special adaptation of their peculiar instinct; for if the attacks were made on the nests of the Negro Ants, before those by whom the race is propagated are ready to issue forth, it must speedily become extinct.-When the Red Ants are about to sally forth on a marauding expedition, they send scouts to ascertain the exact position in which a colony of Negro Ants may be found; these scouts, having discovered the object of their search, return to their nest and report their success. Shortly afterwards, the army of Red Ants marches forth, headed by a vanguard, consisting of eight or ten Ants only, which is perpetually being changed, the individuals which constitute it, halting, when they have advanced a little before the main body, falling to the rear, and being replaced by others. When they have arrived near the Negro colony, they disperse, wandering through the herbage, and hunting about, as if aware of the neighbourhood of the object of their search, yet ignorant of its exact position. At last they discover the settlement; and the foremost of the invaders rushing impetuously to the attack, are met, grappled with, and frequently killed by the Negroes on guard. The alarm is quickly communicated to the interior of the nest; the Negroes sally forth by thousands; and the Red Ants rushing to the rescue, a desperate conflict ensues, which, however, always terminates in the defeat of the Negroes, who retire to the innermost recesses of their habitation. Now follows the scene of pillage. The Red Ants, with their powerful mandibles, tear open the sides of the Negro Ant-hill, and rush into the heart of the citadel. In a few minutes each of the invaders emerges, carrying in its mouth the pupa of a worker Negro; which it has obtained in spite of the vigilance and valour of its natural guardians. The Red Ants return in perfect order to their nest, bearing with them their living burthens. On reaching the nest, the pupa appear to be treated precisely as their own; and the workers, when they emerge, perform the various duties of the community with the greatest energy and apparent good-will; they repair the nest, excavate passages, collect food, feed the larvæ, take the pupa into the sunshine, and perform every office which the welfare of the colony seems to require; in fact, they conduct themselves entirely as if fulfilling their original destination.*

*The details of this Appendix have been chiefly taken from Mr. Newman's very excellent "Familiar Introduction to the History of Insects."