| OCR Text |
Show 160 ME. E. E. AUSTEN ON NEW DIPTEEOUS INSECTS. [J an. 17, posterior tarsi ochraceous rufous; the femora are grooved below towards the tips, and the middle ones bear a small angular process on the posterior side of the groove at the tip; there is a similar but smaller process on the front femora, which, however, is scarcely visible in the $ ; the middle as well as the posterior femora bear small spines below; in the case of the middle femora these are chiefly confined to a line extending backwards on each side of the groove, but on the posterior pair they are scattered about on the middle portion of the underside, as well as running along the ridges bordering the groove. Face and cheeks pale yellow in the d , somewhat deeper yellow in the 5 , the facial tubercle small; front yellow, the vertical triangle in the d and the posterior portion as far as the ocelli in the 2 black; the antenniferous process small, but prominent, a shining black spot above the base of the antenna?, and the median portion of the antenniferous process above black; in the case of the 2 > the front with a median black stripe extending forwards from the ocelli rather more than two-thirds of the distance between them and the base of the antenniferous process, expanding towards and forked at the tip : antennce ochraceous, third joint rounded at the tip ; arista dark brown, pale yellow at the base. The cinereous pollinose stripe on each side of the median line of thorax is very conspicuous; the stripes are only narrowly separated in front and fuse together posteriorly; they almost reach the scutellum ; outside these is a dark brown stripe on each side, and then comes a pale greenish-bronze stripe, outside which, again, is a very narrow brown stripe; this is joined behind the transverse suture by the pleural stripe, which runs to and extends down the middle coxa?; the stripes outside the cinereous pollinose ones are divided by the transverse suture ; the cinereous pollinose stripes are carried forward to the anterior margin of the thorax, with a narrow dark brown border on each side; the remaining stripes are abbreviated in front. Abdomen: the first segment with a conspicuous posterior border dark brown, not quite reaching to the sides ; the remainder of the segment yellow; second segment yellow in the extreme basal angles, and also with an indistinctly defined yellowish blotch on each side in the middle ; the posterior border of the second segment may be narrowly brown; in three of the specimens in the collection there is an indication of a pale yellowish mark on each side near the base of the third segment; the posterior margin on the underside of the fourth segment of the d is raised and excavated, and bears two somewhat hammer-shaped processes, and the anterior margin of the segment on the underside is also excavated; the sixth segment in the d, which ends in the small spine, is globate; in two specimens in the collection the abdomen is of a chestnut colour, and blackish towards the tip, but this is probably due to drying. In the wings the subcostal cell is dark tawny, and the infuscation of the fore-border includes the distal third of the submarginal cell; the central portion of the marginal cell is more ochreous, and the basal |
