Permalink : http://hdl.handle.net/2115/53642

Two anthomyiid species of the genus Chirosia were reared from puparia overwintered in stipe bases of fronds of the Ostrich fern, Matteuccia struthiopteris, in Hokkaido, Japan. One is Chirosia rametoka (Suwa, 1974) and the other is a species described here as Chirosia kogomi sp. nov. Both belong to the Chirosia megacephala section proposed by G.C.D. Griffiths in 2004. C. rametoka may be unique in having the head with wide frons and no differentiated orbital setae in both sexes and in having the female 8th sternite represented by a pair of small sclerites. C. kogomi may be closely related with Chirosia sikisima (Suwa, 1974) and its allied Chirosia major Suwa, 2013 in having the surstyli with a prominent dorsobasal extension and with some stout setae on subapical inner depression, and in having the distiphallus of aedeagus strongly convex dorsally near base of acrophallus.