Abstract
Eryngiopus discus Meyer, 1969 (Acari: Trombidiformes: Stigmaeidae), the first species of the genus Eryngiopus Summers recorded from Saudi Arabia, is re-described and illustrated. The specimens of this species were collected from foxtail grass Cenchrus sp. (Poaceae) and Euryops arabicus (Asteraceae). Also, the species of the genus Eryngiopus are categorized into two species groups, bakeri and gracilis, based on three and four pairs of prodorsal setae, respectively. A key to the world species of the genus Eryngiopus is provided too.