. Fig. 64. Wing of H. irregularis ^. the whole length; fourth vein strongly curved in its first part, for the rest straight, that and the fifth vein rather diverging. Halteres black. Female. Quite similar, only clypeus slightly more distinct, and the apical swelling of third vein a little more pronounced. Length 2,7—3,5 mm. As seen this species is nearly related to and very similar to flavimana^ but it is distinguished with certainty especially by the forked third vein, the broader and duller frons, the quite dull and more hairy abdomen, the shorter first costal division, and the lower bristle
. Fig. 64. Wing of H. irregularis ^. the whole length; fourth vein strongly curved in its first part, for the rest straight, that and the fifth vein rather diverging. Halteres black. Female. Quite similar, only clypeus slightly more distinct, and the apical swelling of third vein a little more pronounced. Length 2,7—3,5 mm. As seen this species is nearly related to and very similar to flavimana^ but it is distinguished with certainty especially by the forked third vein, the broader and duller frons, the quite dull and more hairy abdomen, the shorter first costal division, and the lower bristle on middle tibise being minute and placed at the apex, and finally also by the want of a dorsal apical spur on front tibise. Wood says that there is no lower bristle on middle tibise, he has, I think, not reckoned this very small one. At present there are known in all seven specimens of the species, including three females which sex was not known hitherto; all seven specimens show the thin, but distinct anterior branch of the fork. H. irregularis is rare in Denmark, I have taken in all five spec- imens, two males and three females, in Geel Skov on ^U—^^/lo in 1918 to 1921; they were taken on leaves in a plantation of young syca- mores; on ^/lo a pair was taken in copula. Geographical distribution: — Besides from Denmark the species is only known from England, where two males have been taken by Wood.
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
