. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 100 Phoridae. base. The sacks are somewhat pear-shaped, iDroadest below, erect, and attenuated upwards, the upper part is black; on the hinder side each sack bears a patch of bristles and anteriorly, towards the lateral margins of the fourth segment, there are likewise some bristles (figs. 40, 41). The sacks may be seen protruding to a different degree and sometimes unsymmetrically, one protruding the other withdrawn. — Wings with the apical part brown darkened, this brow^ning is some- times very distinct and rat
. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 100 Phoridae. base. The sacks are somewhat pear-shaped, iDroadest below, erect, and attenuated upwards, the upper part is black; on the hinder side each sack bears a patch of bristles and anteriorly, towards the lateral margins of the fourth segment, there are likewise some bristles (figs. 40, 41). The sacks may be seen protruding to a different degree and sometimes unsymmetrically, one protruding the other withdrawn. — Wings with the apical part brown darkened, this brow^ning is some- times very distinct and rather distinctly bordered inwards, at other times more effaced or nearly wanting; costa considerably thickened in the middle, attenuating towards each Fig. 42. Wing of ?. Length. The species varies much in size, the length varying in all from 2 to 5,5 mm, the female is always the larger; for the male the length is 2—3,5 mm for the female from fully 3—5,5 mm. Ch. thoracica is rather common in Denmark, Vesterfselled, Erme- lund, Dyrehaven, Holte, Bogo south of Sealand, on Langeland at Lohals, on Lolland at Lysemose and in Jutland at Ry, Grejsdal at Vejle and Hejls south of Kolding; the dates are ^^U—^^U, but bred specimens emerged at the end of April. Pupae were taken on Vester- faelled on Vi and in Dyrehaven on ^^4, the latter developing on ^^4; in both localities they were taken in moles' nests (Rosenberg). The species occurs otherwise in low herbage, and I have also taken a specimen on an umbellifer; but generally the species may be seen in some numbers on tree-stems, as also often recorded; in this way I have taken it at Lohals and Hejls in the middle of July, and it seems that the copulation takes place here, for I have taken it in copula on the stems on ^^Z?; when occuring on the stems the females had very often the above mentioned abdominal sacks more or less extended so that it seems rather probable that these sacks have something to do with the c
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
