Cethegus lugubris is a species of mygalomorph spider in the Euagridae family. It is endemic to Australia. It was described in 1881 by Swedish arachnologist Tamerlan Thorell.[1]
The species occurs in Far North Queensland in closed and open forest habitats. The type locality is Somerset at the northernmost tip of the Cape York Peninsula.[1]
The spiders are fossorial, terrestrial predators. They construct tubular silk webs.[1]