Abstract
A remarkable macrocephalic new species of Damaster belonging to the subgenus Acoptolabrus is described under the name of mirabilissimus from South Korea. This species is distinguished from other species of the subgenus by conspicuous hypertrophy of the head and features due to it, including the shape of prothorax. Some of the outstanding characters of this species are unusually developed anterior tooth of right retinaculum, strongly projecting median tooth of mentum, extraordinarily constricted pronotum without posterior marginal setae. The genitalic characters of the male are also very distinctive.
