Abstract
Three species of the genus Cardiastethus Fieber, 1860 are recorded from the Ogasawara Islands, Japan, where no species of the genus has hitherto been known: C. exiguus Poppius, 1913, C. minutissimus Usinger, 1946, and C. yasunagai sp. nov. The new species is fully described and illustrated. A diagnosis is given for each of the two former species. A key to distinguish the three local species is given.