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Show 148 ME. E. E. AUSTEN ON N E W DIPTEEOUS INSECTS. [Jan. 17, vestige of a tubercle, clothed with pale whitish pile, and cinereous pollinose on the sides. Front metallic blue at the sides, bronze-black in the middle, clothed with blackish pile ; the apex of the angle of the eyes and a narrow margin on each side cinereous pollinose : antenniferous process not prominent. Antennee yellow, small; third joint somewhat oblong in shape, rounded at the tip, which, with a rather broad upper margin, is brown. Occiput cinereous, fringed with silvery hairs. Thorax and scutellum metallic bronze-brown, the latter steely on the hind margin; pleurae bronze anteriorly, pale metallic bluish white behind the base of the wings; post-alar callosities reddish : thorax sparsely clothed with very short dark pile, the scutellum with longer pale pile. Abdomen slender, spatulate, steely on first segment, elsewmere brown ; the typical specimen has a narrow transverse faint yellow band, widely divided in the middle, at the base of the fourth segment; genitalia small, concealed : a tuft of whitish hairs on each side of the first segment, and the second and third segments with a fringe of shorter pale hairs on each side ; the abdomen elsewhere nearly bare. Anterior legs yellow, the third and fourth joints of the tarsi, and the outer side of the femora towards the base, brownish ; second and third pairs of legs brown, the bases aud tips of the femora, the basal third of the posterior tibiae, the whole of the middle tibiae, the first two joints of the middle tarsi, the tip of the first and the whole of the second joint of the posterior tarsi, pale yellow : the middle femora with a fringe of rather long pale hairs behind ; the posterior femora with a similar but shorter fringe of hair on the outer and inner side. Third longitudinal vein of the wing straight. Brazil, region of the Amazon (Bates) • two specimens, both males. This species is not closely allied to any other known to m e ; in the markings of the wings it resembles B. bigoti, which, however, distinguishes itself at once by the reddish colour of the basal half of the abdomen, as also by the rudimentary condition of its alula?. BACCHA PUMILA, sp. n. (Plate V. fig. 12, d •) d 2 • Length 6j m m. Yellow, shining: centre of dorsum of the thorax shining black, with three cinereous pollinose stripes; abdomen contracted, but stoid, at the base, then spatulate; ivith dark brown cross-bands and lineate markings. Legs yeUow; posterior femora in the d with the basal third and a band near the tip, posterior tibice with a fainter band near the base, broivn; these markings are much fainter in the 2, and in another d the extreme base of the posterior femora is yellow. Wings hyaline ; subcostal cell broivn : alulas rudimentary. Face and cheeks pale opalescent yellow, a narrow shimmering white border next the eyes, when the face is viewed from above; facial tubercle relatively large, at least in the d , rounded ; in the d, frontal triangle and antenniferous projection pale shining yellow with a black dot above the base of the antenna?; vertical |
