Archive image from page 111 of Diptera danica genera and Diptera danica : genera and species of flies hitherto found in Denmark dipteradanicagen06lund Year: 1907 100 Phoridae. base. The sacks are somewhat pear-shaped, broadest below, erect, and attenuated iipwards, 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 The sacks may be seen protriiding to a difTerent degree and sometimes unsymmetrically, one protruding the other withdrawn. — Wings with
Archive image from page 111 of Diptera danica genera and Diptera danica : genera and species of flies hitherto found in Denmark dipteradanicagen06lund Year: 1907 100 Phoridae. base. The sacks are somewhat pear-shaped, broadest below, erect, and attenuated iipwards, 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 The sacks may be seen protriiding to a difTerent degree and sometimes unsymmetrically, one protruding the other withdrawn. — Wings with the apical part brown darkened, this browning 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 end. I Fig. 42. Wing of Ch. thoracica ?. 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, Vesterfælled, Erme- lund. Dyrehaven, Holte, Bogø 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 /s—Vs, but bred specimens emerged at the end of April. Pupæ were taken on Vester- fælled 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 liere, for I have taken it in copula on the stems on 7?; when occuring on the stems the females had very often the above mentioned abdominal sacks more or less extended
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