English: Helluomorphoides praeustus bicolor (Harris). Adults of most carabids are opportunist predators or scavengers but those of Helluomorphoides seem to have adopted a different, more dangerous life-style. Adults of two North American species have been observed to plunder foraging and migrating columns of army ant species of the genus Neivamyrmex and run away with their prey and broods. The beetles do not inhabit the ant nest or bivouac but can detect and follow the chemical trails of the ants at night. Whether this habit is common to all species of Helluomorphoides remains to be investigated.