Abstract
The distribution records of Feltiellaacarisuga (Vallot) (Diptera: Cecidomyiidae) in Japan were previously based only on the collecting data of Feltiella sp. from Kagoshima in 1971. We identified acarivorous gall midges collected from various localities in Japan as F.acarisuga and found that it is widely distributed in Japan from Hokkaido to Okinawa. A supplementary description to that made by Gagne in 1995 is provided, together with illustrations of the male fifth flagellomere, male genitalia, pupa, and pupal frons. We also provide information on mites on which it preys and ecological traits of F. acarisuga and devote a brief discussion to its use as a biological control agent. We newly confirm that F. acarisuga fed on Acaphylla theavagrans Kadono (Acarina: Eriophyoidea) in addition to tetranychid mites that were recorded earlier. For the convenience of applied entomologists, differences between larvae of F.acarisuga and those of other free-living cecidomyiids that may sometimes be present on the same leaf are briefly explained.
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