The Lumbuans were a sentient species of red-skinned humanoids about the same size as Ithenites. They had a pre-warp culture and believed dilithium crystals to be useless. They were unaware of other sentient lifeforms in the galaxy, though some of them maintained a belief in "spirits." Their people were obsessed with debate and philosophy, which they used to resolve issues more often than violence. (TTN novel: Over a Torrent Sea)