. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 22 Orthorrhapha brachycera. the discal vein, brownish, in the apical half yellowish; stigma light yellow, just occupying the space between costa and the radial vein, the cubital vein forked at the apex. Halteres blackish brown, peduncle a little paler. Female. Antennae yellow, the annulated complex larger than in the male. Front moderately broad, not occupying one third of the. Fig. 6. Wing of P. tarsalis. breadth of the head, shining black with a median longitudinal ridge; two silvergrey spots above the antennae
. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 22 Orthorrhapha brachycera. the discal vein, brownish, in the apical half yellowish; stigma light yellow, just occupying the space between costa and the radial vein, the cubital vein forked at the apex. Halteres blackish brown, peduncle a little paler. Female. Antennae yellow, the annulated complex larger than in the male. Front moderately broad, not occupying one third of the. Fig. 6. Wing of P. tarsalis. breadth of the head, shining black with a median longitudinal ridge; two silvergrey spots above the antennae. Lenght 3,5—4,5 mm. The larva is brownish or greyish brown with two more or less indistinct, lighter, longitudinal lines on the dorsal and ventral surfaces, these lines being more conspicuous in the pupae: the length of the larva is abt. 8 mm. P. tarsalis seems also rather rare here, and it has only been bred; Gharlottenlund, Dyrehaven and on Lolland at Maribo (W. SchUck). The larva was taken under bark and in decaying wood of beeches, oaks and apple-trees; it was taken from the beginning of June to the middle of July, and the imagines developed in the same months. Jaennicke (Berl. Ent. Zeitschr. 1866, X, 220) refers it to have been bred from beech {rohustus Jaennicke = tarsalis Zett.) Geographical distribution: — Northern and middle Europe, in north to southern Sweden and in south to middle Germanv. Of the genus Pachygaster there is thus hitherto known two species from Denmark. There is some reason to think that also P. atra Panz., Leachii Curt, and perhaps also meromelas Duf. may be found, as they occur both north and south of Denmark and also are found in Britain. They will be easily distinguished from the two species described. P. atra has the wings fumigated on the basal half, but the male has black antennae, and both sexes want the silvergrey spots above the antennae; P. Leachii has the wings entirely hyaline and the legs quite pale, only with a black ring at the tip
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
