OCR Text |
Show 1893.] ME. E. E. AUSTEN ON NEW DIPXEEOUS INSECTS. 139 bluntly oval; arista brown, except the base. Thorax metallic black, finely punctate, with very short, silky, yellowish pile; humeri, a stripe from them to the suture, a vertical stripe on the pleurae in front of the suture, a large rounded spot below this stripe, an oblique elongated spot behind the base of the wings, and the anterior margin of the scutellum pale yellow. Scutellum, except anterior margin, blackish brown, punctate. Abdomen cylindrical aud very narrow from posterior half of first segment to middle of third, expanding and spatulate from thence to the tip ; general colour reddish brown, clothed with short, appressed, blackish pile; second segment with fine, whitish, erect pile on the sides ; a very conspicuous translucent yellow spot, occupying distal third (rather more in § ) of the third segment, and shaped like an equilateral triangle; first segment yellow, brown at the tip; second segment reddish brown, darker at the tip, before which is a narrow indistinct lighter band ; base of third segment yellowish, posterior margin brown; fourth segment polished dark brown, steely on posterior margin in d ; fifth segment polished dark brown, with a steely sheen; external genitals reddish in both sexes, rather prominent in d • Legs luteous, coxae blackish brown ; posterior femora reddish brown, yellowdsh at the base ; posterior tibiae pale yellow on basal third, then dark brown ; first joint of posterior tarsi dark brown, except at the tip ; this and the remaining joints dull yellow. Wings hyaline, with a brownish tinge along the posterior margin ; subcostal cell dark brown, and a brownish patch at the distal extremity of the marginal and submarginal cells, terminating sharply at the third vein ; the latter straight; veins dark brown : alulas almost absent. In the shape of the profile of the face and in the venation of the wing, this species resembles B. pedicellata, Dol. (according to Doleschall's figure), from Java; but the sharply-defined yellow triangle on the third abdominal segment distinguishes the species from any other known to me. Huldamulla, Ceylon; circa 4000 ft. (Lieut.-Colonel Yerbury). A pair taken in copula, June 10, 1892. BACCHA PULCHRIERONS, sp. n. (Plate IV. figs. 10,10 a, 11, d 2 •) d 2 • Length : d 10 to 11£ mm., $ 9f to lOf m m . In d 5 front, upper part of the face immediately below the antennae, and a broad facial stripe reaching to the oral margin steely. In 2 •> front> including whole circumference of antenniferous projection and a facial stripe, narrower than in the d, but reaching to the oral margin, metallic black, sometimes steely; sides of face yellowish pollinose ; cheeks orange-yellow, with a blackish-brown spot in front, more or less distinctly connected with the facial stripe, sometimes indistinct in the $ . Front (including vertical triangle in the d ) and face clothed with pale yellow pile. Frontal triangle in d dusted with yellowish pollen above ; front in $ , a little below the middle, with a triangular patch of pale yellow pollen on each side, the apices of the triangles meeting or narrowly |