During the survey of chiromonid midges from Kyushu, the authors found a new species of Podonominae (Chironomidae),Boreochlus longicoxalsetosus. The male imago of this new species is described and illustrated. This constitutes the third record of the subfamily Podonominae, and the second species of the genus from Japan. The new species has very long notable setae lying on the dorsomedial surface distal to the volsella, which are never seen in the otherBoreochlusspecies. A key to species of the genus in the world is given.