. Fig. 129. Wing of Ch. arenaria. {the author); it was present in great numbers together with the three preceding species. It is especially found running in the sea-weed on the shore among which it slips swiftly, and it seems never to fly, for which, I think, the wings are not sufficiently developed. Geographical distribution: — Scandinavia, Denmark and England; it goes towards the north to northern Sweden but it is not known south of Denmark and England. 5, Ch. incana Walk. 1851. Walk. Ins. Brit. 1, 138, 3. — 1903. Kat. palaarkt. Dipt. 11, 278. Male. Frons and vertex grey; epistoma and palpi
. Fig. 129. Wing of Ch. arenaria. {the author); it was present in great numbers together with the three preceding species. It is especially found running in the sea-weed on the shore among which it slips swiftly, and it seems never to fly, for which, I think, the wings are not sufficiently developed. Geographical distribution: — Scandinavia, Denmark and England; it goes towards the north to northern Sweden but it is not known south of Denmark and England. 5, Ch. incana Walk. 1851. Walk. Ins. Brit. 1, 138, 3. — 1903. Kat. palaarkt. Dipt. 11, 278. Male. Frons and vertex grey; epistoma and palpi whitish grey. Occiput grey, only with short hairs, but without bristles. Antennee blackish or brownish, arista short. Thorax light grey, the disc clothed with short, white hairs, which are divided by two bare stripes into biserial acrostichal hairs and dorsocentral hairs, which latter are fused with the hairs on the sides. There is one white notopleural bristle, but I could detect no other bristles. Scutellum without bristles. Pleura light grey, above the middle coxae a more or less distinct, very small, black, polished spot. Abdomen light grey, venter of the same colour; some small white hairs are seen only at the sides. Legs blackish, a little greyish pruinose; the knees more or less reddish; generally the hind tibiae and especially the metatarsi pale. The front femora a little thickened. The legs are short-haired; the anterior femora with fine, short hairs below; the front tibiae with a pair of ventral subapical bristles, the middle tibiae wMth a pair of bristles near the apex; the hind tibife with a few bristles at the apex on the dorsal and anterior side. The wings somewhat milk-white. Veins pale brown. Halteres whitish. Female. Quite similar to the male; abdomen pointed. Length —1,g mm.
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
