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Show 140 ME. E. E. AUSTEN ON NEW DIPTEROUS INSECTS. [Jail. 17, separated in the median line. A distinct facial tubercle and antenniferous process, the latter somewhat more pronounced in the 2 than in the d • A lunate spot on each side of the antenniferous process metallic violet. Antennas orange-yellow ; third joint oval; arista brown, yellow at the base. Occiput black, whitish pollinose, with a fringe of pale hairs. Thorax and scutellum: in d metallic bronze-black, clothed with golden pile; in $ metallic blue-black, clothed with shorter whitish-yellow pile; in the d a sometimes obscure yellowish vertical stripe on the pleurae beneath the suture; in the $ , humeri and a similar vertical stripe on the pleurae light yellow, the stripe with whitish pile. General colour of the abdomen bronze-black, with yellow markings ; clothed with erect aud rather long yellowish pile on the sides of the first three segments, and elsewhere with appressed pile, black on the black and whitish on the yellow portions : the sides of the third and fourth segments in the d are so curled round ventrally as to make the abdomen at the tip appear not more than double the width of the second segment at the base; distal half of the abdomen of the 2 spatulate ; first segment reddish yellow, brown on the hind margin, sometimes wholly brown or bronze-black in the d ; second segment bronze in the d, sometimes reddish on each side at the base, with a more or less distinct reddish-yellow transverse band on the second sixth from the hind margin ; in some specimens the second segment is wholly bronze-black in the d, except the posterior fifth, which is dull black; second segment in the $ metallic black, with a reddish-yellow band on the second fifth from the hind margin, and sometimes reddish yellow at the base; third segment in the d bronze on the basal and dull black on the apical third, with a quadrate yellow spot on each side in the middle ; third segment in the $ metallic black, with a yellow, somewhat triangular spot on each side in the middle, the apices directed outwards, and the bases inclined one towards another and sometiaies narrowly meeting in the middle line in front; the posterior side of each triangle concave; fourth segment in the d bronze-black, with a quadrate yellow spot on each side at the base, occasionally somewhat obscure, but when distinct deeply emarginate posteriorly, so that each spot shows a sharp angle projecting backwards on each side of the median line; fourth segment in the $ metallic black, with a yellow longitudinal stripe on each side of the median line, starting from the base and running the whole length of the segment, and a broader yellow elongated spot starting from the base of the yellow stripe on each side and running obliquely outwards, so as almost to cut off a basal angle; in some specimens the yellow longitudinal stripes become obsolete before reaching the hind margin of the segment, and in others apparently do not run more than halfway; fifth segment in the d wholly metallic black; genitalia small, metallic black ; fifth segment in the $ metallic black, with a somewhat confused repetition in miniature of the yellow markings on the fourth segment. Legs yellow; coxae blackish brown, and a band on the outer half of the posterior |