- A lepidopterous insect, which in the larval state often
travels in great multitudes from field to field, destroying grass,
grain, and other crops. The common army worm of the northern United
States is Leucania unipuncta. The name is often applied to other
related species, as the cotton worm. - The larva of a small two-winged fly (Sciara), which
marches in large companies, in regular order. See Cotton worm, under
Cotton.