One of the most interesting features of ant-societies is the dimorphism or polymorphism that may often be seen among the workers, the same species being represented by two or more forms. Thus the British " wood ant " (Formica rufa) has a smaller and a larger race of workers (" minor " and " major " forms), while in Ponera we find a blind race of workers and another race provided with eyes, and in Atta, Eciton and other genera, four or five forms of workers are produced, the largest of which, with huge heads and elongate trenchant mandibles, are known as the " soldier " caste.
I, Atta cephalus; 2, Eciton drepanophora; 3, Eciton erratica.
Long, made by Atta fervens.
ATAULPHUS (the Latinized form of the Gothic Ataulf, "Father-wolf," from atta, father, and vulfs, wolf; mod.