l60 MB. E. E. AUSTBX ON JfEW DIPTEEOUS ISSECTS. [Jan. 17, 



posterior tarsi ochraceous rufous ; the femoi-a are gi-ooved below 

 towards the tips, and the middle oues bear a small angular process 

 ou 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 ou the 

 middle portion of the underside, as well as running along the 

 ridges bordering the groove. 



Face and cheeJcs pale yellow in the c? , somewhat deeper yellow 

 in the $ , the facial tubercle small ; front yellow, the vertical 

 triangle in the c? and the posterior portion as far as the ocelU in 

 the 2 black ; the autenniferous process small, but prominent, a 

 shining black spot above the base of the antennae, and the median 

 portion of the autenniferous process above black ; in the case of 

 the 2 1 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 : antenna' ochraceous, third joint 

 rounded at the tip ; arista dark brown, pale yellow at the base. 

 The cinereous lyollinose stripe on eath side of the median line of the 

 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 ou each side, and 

 then comes a pale greenish-bronze stripe, outside which, again, is 

 a vei'y uarro\^' bro\vn stripe ; this is joined behind the transverse 

 suture by the pleural stripe, -which runs to and extends down 

 the middle coxae ; the stripes outside the cinereous poUinose ones are 

 divided by the transverse suture ; the cinereous poUiuose stripes 

 are carried forward to the anterior margin of the thorax, with a 

 narrow dai-k brown border on each side ; the remaining stripes 

 are abbre\aated in front. Abdomen : the first segment with a 

 conspicuous posterior border dark brown, not quite reaching to 

 the sides ; the remainder of the segment yeUow ; second segment 

 yellow in the extreme basal angles, and also ^nth 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 (S 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 S , 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 win(js the sub- 

 costal 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 



