. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. 344 Orthorrhapha brachycera. little converging towards the cubital vein. Squamulæ pale yellow, with a pale fringe. Halteres yellow. Female. Epistoma a little broader than in the male, grey, the greenish ground colour shining a little through. The arista a little longer than in the male. The spines below the front femora towards the anterior side reaching to the apex, and besides the two rows there are some spines posteriorly towards the apex; the front tibiæ have two ventral rows of spines, and a row
. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. 344 Orthorrhapha brachycera. little converging towards the cubital vein. Squamulæ pale yellow, with a pale fringe. Halteres yellow. Female. Epistoma a little broader than in the male, grey, the greenish ground colour shining a little through. The arista a little longer than in the male. The spines below the front femora towards the anterior side reaching to the apex, and besides the two rows there are some spines posteriorly towards the apex; the front tibiæ have two ventral rows of spines, and a row of a few bristles on the dorsal side; the bristles on the posterior legs a little longer. Length 2,8—5,3 mm, the female longest. This species besides by the two scutellar bristles is also easily known by the bristles on the front coxæ. H. bisetus is rare in Denmark, or perhaps more correctly very local; Jutland at Skagen (four specimens taken many years ago), and on Læsø, in rather great number (H. J. Hansen). It occurs at sea- coasts. Geographical distribution:— England, Denmark and Spain; it has been known as common in England for more than fifty years, but it was first recorded from the continent by Strobl in 1909 (Verhandl. zool. bot. Gesell. Wien, 59, 192), who took it in Spain; as said above it has stood undetermined in our collection for many years. 2. H. balticus Meig. 1824. Meig. Sysl. Beschr. IV, 66, 12 {Medeterus). — 1849. Zett. Dipt. Scand. VIII, 3050,3. — 1862. Schin. F. A. I, 231. — 1903. Kat. palåarkt. Dipt. II, 341. — Hijdrophorus litoreus 1838. Zett. Ins. Lapp. 700,3, , et 1843, Dipt. Scand. II, 443, Male. Head about as high as broad; vertex and frons brown. Epistoma broad, bright metallic green above, whitish grey Fig. 106. Antenna of H. balticus d. X 95. Palpi brown. Occiput greenish or æneous, greyish pruinose; post- ocular bristles black, the hairs below white. Jowls distinct, grey. Antennæ black, third joint roundish, a
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