Review of the genus Acantholabus Heinrich (Hymenoptera: Ichneumonidae)

The genus Acantholabus Heinrich, 1974 is reviewed. The three previously known species are re-described, and a new species, Acantholabus yunlingensis Reshchikov &; Kikuchi sp. nov., from Northwestern Yunnan, is described and illustrated. An identification key to the species of the genus is also provided.