. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. J34 Orthorrhapha brachycera. Insectol. Sieelland. 1761) has the same, and it is again recorded in 1763 (Pontopp. Danske Atl). MuUer (Flor. Fridrichsd. App. 1767) again has only the same. About this species can only be said that it is a Thereva, and probably our most common species, T. ?iobilitata. Fabricius in 1775 (Syst. Entom.) has the new species Bibio nohilitata; in his following works he has only the same, but in 1805 in his last work (Syst. Antl.) he has further Bihio amiidata, also a new species. These two
. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. J34 Orthorrhapha brachycera. Insectol. Sieelland. 1761) has the same, and it is again recorded in 1763 (Pontopp. Danske Atl). MuUer (Flor. Fridrichsd. App. 1767) again has only the same. About this species can only be said that it is a Thereva, and probably our most common species, T. ?iobilitata. Fabricius in 1775 (Syst. Entom.) has the new species Bibio nohilitata; in his following works he has only the same, but in 1805 in his last work (Syst. Antl.) he has further Bihio amiidata, also a new species. These two common species were thus originally founded on Danish specimens. Zetterstedt in 1842 (Dipt. Scand. I) records one species, nohilitata, from Denmark and no more in the following volumes. Finally Loew in 1847 (Dipt. Beitr. II) records hipunctata from Den- mark. Thus in all three species were known. In the present work 10 species are enumerated. Only one genus, Thereva, occurs in Denmark. 1. Thereva Latr. Species of medium size, more or less hairy, generally the males somewhat long haired, the females shorter and more sparingly haired. The colours greyish or yellowish to blackish, sometimes silverwhite. Head as broad as thorax, broader than high; it is somewhat arched in front, but the face which looks forwards and downwards is some- what flattened; the head is slightly arched behind; the frons is some- times more or less protruding. Eyes in the male somewhat reniform, touching, in the female well separated, the vertex being more or less. Fig. 45. Antenna of T. nohilitata. X 35. broad; in the female the frons very often has a black, shining callus, sometimes divided into two. The eye-facets are in the male larger in the upper part than below. The colour of the eyes is more or less dark greenish, slightly metallic, in some species as a?iilis and annulata bright green; along the posterior eye-margin there is a row of weaker or stronger occipito-orbital bristles, they are generally
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
