In this publication, the fourth of a projected series revising the Afrotropical species of the genus Quartinia Ed. André, 1884 (Hymenoptera: Vespidae: Masarinae), 14 species with complete venation are dealt with. Ten new species are described: arenaria, atlantica and luteomandibulata from the seaboard of the Western Cape of South Africa, namibensis from south-western Namibia and carolinae, frontalis, scutellaris, setaria, setositerminalis and upingtonensis from the Northern Cape of South Africa. The hitherto unknown female of namaquensis Gess and the males of persephone Richards and vagepunctata Richards are described. The identity of the male of parcepunctata Richards as described by Richards is confirmed. A key to facilitate the separation of the sympatric and generally similar looking frontalis, scutellaris, setositerminalis and vagepunctata is given. Extensive collection data pertaining to most of the species contribute to the knowledge of their distribution and floral associations.