The giant-skippers are larger than the other members of the family Hesperiidae, but are medium-sized butterflies with thick bodies. They tend to be brown with yellow markings. The antennae are unhooked and some species even possess a short apiculus. Long hairlike scales are present on the upperwings of males. Their flight is fast and rapid. Males are territorial and tend to perch on low vegetation. Adults do not derive sustenance from flowers and rarely feed. Males do visit wet sand in order to drink. The eggs of members of the genera
Megathymus and
Stallingsia are glued to leaves, while the eggs of
Agathymus species are dumped into host plant clumps. The
caterpillars of the giant-skippers bury themselves into the leaf or stem of a plant and feed from within the silk-lined tunnels they create.
Pupae are formed in these tunnels. ==Genera==