. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. 188 Orthorrhapha brachycera. of bristles above, and one ventral bristle; hind tibiæ with two rows above and with a few, smaller ventral bristles. Wings somewhat brownish tinged, most towards the anterior margin; they are a little broader than in celer as the anterior margin is curved a little out-. Fig. 55. Wing of H. brevicornis cf. wards; veins black, costa thickened as in cele?-; discai vein with a very slight bend, a little converging towards the cubital vein; axillary lobe a little larger than in
. Diptera danica : genera and species of flies hitherto found in Denmark. Diptera -- Denmark. 188 Orthorrhapha brachycera. of bristles above, and one ventral bristle; hind tibiæ with two rows above and with a few, smaller ventral bristles. Wings somewhat brownish tinged, most towards the anterior margin; they are a little broader than in celer as the anterior margin is curved a little out-. Fig. 55. Wing of H. brevicornis cf. wards; veins black, costa thickened as in cele?-; discai vein with a very slight bend, a little converging towards the cubital vein; axillary lobe a little larger than in celer. Squamulæ yellow, with a black fringe. Halteres yellow. Female. Epistoma broad. Antennæ about as in the male. Wings more tinged and with the thickening of costa present, but thinner than in the male. Hind metatarsi generally quite black. Length 3—3,8 mm. H. brevicornis is common in Denmark; Charlottenlund, Ordrup Mose, Ermelund, Dyrehaven, Bøllemosen, Geel Skov and Ørholm; it has thus hitherto only been taken on Sealand. My dates are ^^le—^ls. It occurs in woods at the horders of water and on water piants in ditches, often in great number; though this species and celer occur in similar localities I have however never taken them together. — The species was originally founded on Danish specimens. Geographical distribution:— Northern and middle Europe down into Styria and Hungary; towards the north to southern Sweden. Remarks: H. celer and brevicornis may in the males easily be distinguished by the colour of the lamellæ of the hypopygium; also celer has longer antennæ with a more distinctly haired arista, and a broader epistoma; the females are very similar, they may on close examination always be known as belonging to one of the two species by the slight thickening of the costa near the base, but they are diffi- cult to distinguish from one another; brevicornis may be known from celer by the somewhat broader wings, the costal margin being less straight than
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