Army Worm
the very destructive larva of the moth heliophila or leucania unipuncta, so called from its habit of marching in compact bodies of enormous number, devouring almost every green thing it meets. It is about 1/2 inches long, greenish in color, with black stripes, and is found in various parts of the world, but is particularly destructive in North America. The larva of sciara militaris, a European two-winged fly, is also called army worm.