. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 280 Orthonhapha brachyceia. It was several times taken in copula. This species occurs both on the sea-shore and on borders of fresh water. Geographical distribution:— The species is hitherto known from Scandinavia, England and Denmark; it goes towards the north to middle Sweden. Zetterstedt also records the species both from sea- shores and from the borders of streams and lakes, e. g. at Wettern. 3. Ch. difficilis n. sp. This species resembles cursitans to so high a degree that I shall only give the differences:
. Diptera Danica: genera and species of flies hitherto found in Denmark. Diptera. 280 Orthonhapha brachyceia. It was several times taken in copula. This species occurs both on the sea-shore and on borders of fresh water. Geographical distribution:— The species is hitherto known from Scandinavia, England and Denmark; it goes towards the north to middle Sweden. Zetterstedt also records the species both from sea- shores and from the borders of streams and lakes, e. g. at Wettern. 3. Ch. difficilis n. sp. This species resembles cursitans to so high a degree that I shall only give the differences: Male. Occiput with only two bristles above. The acrostichal bristles are more regularly biserial. A humeral bristle, some noto- pleural, a supraalar and a postalar bristle are present, but I could detect no posthumeral bristle. The exterior genitalia are smaller, narrower than the last abdominal segment, and greyish pruinose; they terminate with an upwards curved, black, shining process, which is dilated and spoon-shaped at the apex. The legs black or reddish brown, sometimes still paler, somewhat shining, not pruinose: the middle tibiae with a pair of bristles on the dorsal side and one on the anterior side. The hind metatarsi not much longer than the second. Fig. 128. Wing of Ch. (Uffinlis. joint. Wings a little greyish or brownish, a space, bordered behind by an oblique line stretching from the base of the cubital vein to the end of the subcostal vein and below by the cubital vein, is distinctly brown; the radial vein terminates in the middle between the ends of the subcostal and the cubital vein, at the same distance from each. Female. Similar to the male; abdomen pointed. Length 1,8—2,4 mm. This species resembles cursitans very much, but is distinguished with certainty by the shining legs, the bristles on the middle tibiae and especially by the direction of the radial vein; in the male also the genitalia are characteristically different. I was in doubt which of the two
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
