Cethegus robustus is a species of mygalomorph spider in the Euagridae family. It is endemic to Australia. It was described in 1984 by Australian arachnologist Robert Raven.[1]
The species occurs in Far North Queensland in open forest habitats. The type locality is Chillagoe.[1]
The spiders are fossorial, terrestrial predators. They construct curtain-like silk webs over their burrows.[1]