Haitlingeria longilobata n.g., n.sp. (Acari: Astigmata: Canestriniidae) is described from Serrognathus platymelus castauicolor Motschulsky (Coleoptera: Lucanidae) from South of Korea. Diagnostic features include: the presence of two long lobes on the male opisthosoma; the idiosoma length is similar to the idiosoma width; hysterosoma ornamented by distinct reticulate pattern; suture separating propodosoma from hysterosoma present; adanal suckers well developed on the male; four pairs of ultralong setae; solenidion ö on tibia I very long.