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178 with nothing to do save at the times when life has to be staked for the defence of the community. There are no leaders, or at any rate no permanent leaders. We see neither kings nor generals. The expeditionary armies of Polyergus rufescens, which may vary from one hundred thousand to two hundred thousand ants, act in obedience to streams of influence which appear to emanate from small and scattered groups, sometimes in the van and sometimes in the rear. When the army is on the march, the entire column will suddenly halt, remaining indecisive and motionless, as if paralysed. Of a sudden, the initiative will be taken by some small group of ants whose members rush about among the others, striking these on the head; then the temporary leaders start off, and the whole army is in motion once more.

Formica sanguinea is an able tactician. Forel follows Huber in his description of the fighting methods of this species. The insects do not advance in close formation, à la Hindenburg, but in platoons, communicating one with another by orderlies. They do not make a frontal attack; but, after watching the enemy’s movements, attempt to take him by surprise on the flank. Their aim, like that of Napoleon, is to concentrate upon a given point at a particular time, to secure there and then the advantage of numbers. Like Napoleon, too, they know how to lower the adversary’s morale. Seizing the psychological moment when the enemy’s courage or confidence flags, they hurl themselves upon him with irresistible fury, now recking nought of numbers, for they know that at such a time one fighter on their own side is worth a hundred on the other, where panic is rife. Moreover, like good soldiers, their aim is not to kill, so much as to gain the victory and to harvest its fruits. When the battle is won they post a guard at each exit of the conquered nest. The members of this guard allow the enemy ants to escape, provided these carry nothing away. The victors pillage to the uttermost, but do as little killing as possible.