Gromphadorhini, the hissing cockroaches, is a tribe of large, flightless cockroaches comprising 20 known species in six genera. All but one are from the island of Madagascar, where they inhabit wood, leaf litter or rocky crevices in forest or woodland; the one exception, Elliptorhina lefeuvri, being from Europa Island off the coast of Madagascar. Many of the species are popular in the pet trade.