| OCR Text |
Show 162 MR. E. E. AUSTEN ON NEW DIPTEROUS INSECTS. [Jail. 17, ceous rufous, third joint rather broad (actually larger than _ in S. virgata, although the insect itself is smaller), rounded at the tip ; arista dark brown ; the black stripes on the dorsum of the thorax consist of a very narrow median one, and a broader one on each side of it; the stripes converge posteriorly, and apparently fuse a short distance before the scutellum, which they do not reach; each of the broader black stripes is separated from the narrow median one by a stripe of the ground-colour rather broader than itself ; there is an indication of a faint brown stripe on each side of the dorsum, with a conspicuous dark brown spot behind the suture, where it is joined by the brown stripe of the pleurae, which curves round the front of the base of the wing; there is also a dark brown spot beneath the shining yellow post-alar callosities. Brazil, Para (Bates) : one specimen. This species is distinguished, by the markings of the dorsum of thorax, from any other Salpingogaster yet described. BRACHYOPINI, Williston. Synopsis N. Amer. Syrphidae, Bull. 31, U.S. Nat. Mus. p. xxii. RHINGIA, Scop. RHINGIA SEMI-CERULEA, sp. n. (Plate V. figs. 1, 2, d-) d • Length 11^ mm. Dorsum of thorax deep metallic blue round the sides, greenish bronze on the centred area ; scutellum metallic blue, darkish bronze at base in the centre ; pectus and pleurae metallic plum-purple, some the divisions with ochraceous undertints; abdomen brassy ochraceous, pale yellowish at the base, hind margins of the segments narrowly black ; wings with a very faint ochreous tinge, nearly hyaline, the subcostal cell not darker ; halteres yellow; legs yellow, the last joints of the posterior tarsi brown. Face, episioma, and frontal triangle shining ferruginous ; vertical triangle dark blue; antennas ferruginous, rather more than the basal half of the arista yellow, the rest brown ; thorax and scutellum finely punctate, clothed with short dark pile ; post-alar tubercles ochraceous rufous, with a purplish blotch on the outside. Abdomen: first segment pale yellowish, with the black hind-margin confined to a very narrow- streak on each side of the median line, not reaching to the sides; second segment yellowish on the basal two-thirds, then brassy ochraceous, like the remainder of the abdomen ; the shining black hind-margins of this and the two following segments are very sharply defined ; the second segment has a fringe of pale yellow pile on each side, longer towards the base; third and fourth segments thinly clothed with pale yellow pile, which is longer on the fourth segment. Sierra Leone (Foxcroft): one specimen. This species is allied to Eh. ccerulescens, Lw. (' Dipterenfauna Sudafrika's,' p. 302 [374], from Caffraria, but is distinguished at once by the colour of the thorax and abdomen. |
