. Fig, 18. Wing of 0. tigrina. front with an impressed middle line; hinder eye-margin with white, shining pubescence. Thorax on the disc with short, depressed, greyish white shining pubescence. Pubescence on abdomen greyish. Length 7,5—10,5 mm. The larva is lighter or darker brown, sometimes almost black, with some, often indistinct, longitudinally arranged darker markings; it is rather densely, short haired on both surfaces; it has forwards curved spines on the hind margin of the ventral side of the seventh abdominal segment. When full grown its length is about 16 mm. 0. tigrina is common in
. Fig, 18. Wing of 0. tigrina. front with an impressed middle line; hinder eye-margin with white, shining pubescence. Thorax on the disc with short, depressed, greyish white shining pubescence. Pubescence on abdomen greyish. Length 7,5—10,5 mm. The larva is lighter or darker brown, sometimes almost black, with some, often indistinct, longitudinally arranged darker markings; it is rather densely, short haired on both surfaces; it has forwards curved spines on the hind margin of the ventral side of the seventh abdominal segment. When full grown its length is about 16 mm. 0. tigrina is common in Denmark in localities near water, where it occurs in rushes and low herbage; Damhusmosen, Utterslev Mose. Vangede Mose at Gentofte, Ermelund, Dyrehaven, Ruderhegn, Fures0, Lillerod, Hillerod, at Frederikssund and Roskilde; LoUand in Norreskov at Maribo and at Ryde, and Funen at Assens. It is an early species, )ny dates are ^**'5—^^/- '|^|^g larvae and pupae have been taken in water and flood refuse in Damhusmosen, Utterslev Mose, Fures0 and several other localities on ^'^U—2^5, they developed to ^"^«. Geographical distribution: — Common in the northern and middle Europe from middle Sweden down into France. 2. O. argentata Fabr. 1794. Stratiomijs, Fabr. Ent. Syst. IV, 266. 15. — 1842. Stratiomys, Zett. Dipt. Scand. I, 137, 6. — 1844. Stratiomys, Schiedte, Nat. Tidsskr.*2. I. 40. — 1846. Loew, Linn. Entom. 1, 476, 5. — 1862. Schin. F. A. I. 20. — 1903. Kat. palaarkt. Dipt, II, 23. Male. Eyes bare, facets in about the lower fourth part smaller than in the larger upper part, the dividing line rather sharp; colour
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
