162 MR. E. E. AUSTEN Ols NEW DIPTEROUS INSECTS. [.1.111.17, 



ceous rufous, third joiut rather broad (actual!}' Inrger than in 

 S. virr/ata, although the insect itself is smaller), rounded at the tip ; 

 arista dark brown ; the black stripes on the dorsum of the thorax 

 consist of a very narrow median one, and a broader one on each 

 side of it ; the stripes converge posteriorly, and apparently fuse a 

 short distance before the scutellum, which they do not reach ; 

 each of the broader black stripes is separated from the narrow 

 median one by a stripe of the ground-colour rather broader than 

 itself ; there is an indication of a faint bro^ n stripe on each side 

 of the dorsum, with a conspicuous dark brown spot behind the 

 suture, Mhere it is joined by the brown stripe of the pleurse, which 

 curves round the front of the base of the wing ; there is also a 

 dark brown spot beneath the shining yellow post-alar callosities. 



Brazil, Para (Bates) : one specimen. 



Thib- species is distivgitisJied, hy the nmrJcinr/s of tJte dorsmu of the 

 iJiora.v, from any other Salpiugogaster yet descrihed. 



B R A c H Y o p I N I, AVilliston. 

 Synopsis N. Amer. Syrphidte, Bull. 31, U.S. Nat. Mus. p. xxii. 



Ehingia, Scop. 

 Ehingia semi-c.erulea, sp. n. (Plate V. figs. 1, 2, c?.) 



cJ . Length llg mm. 



Dorsum of thorax deep metallic blue round tlie sides, greenish hronze 

 on the central area ; scutellum metallic blue, darhish hronze at the, 

 base in the centre ; pectus and pleurce metallic plum-purple, some of 

 the divisions ivith ochraceous undertints j cd>domen brassy ochraceous, 

 pale yellowish at the base, hind margins of the segments narrou'ly 

 blacJc ; vjings luith a very faint ochreoiis tinge, nearly hyaline, the 

 subcostcd cell not darlrr ; halteres yellow ; legs yellow, the last four 

 joints of the posterior tarsi brown. 



Face, epistoma, and frontal triangle shining ferruginous ; vertical 

 triangle dark blue; antennce ferruginous, rather more than the 

 basal half of the arista yellow, the rest brown ; thorax and scutellum 

 finely punctate, clothed with short dark pile ; post-alar tubercles 

 ochraceous rufous, with a purplish blotch on the outside. Abdo- 

 men: first segment pale yellowish, with the black hind-margin 

 confined to a very narrow streak on each side of the median line, 

 not reaching to the sides ; second segment yellowish on the basal 

 two-thirds, then brassy ochraceous, like the remainder of the 

 abdomen ; the shining black hind-margins of this and the two 

 following segments are very sharply defined ; the second segment 

 has a fi'inge of pale yellow pile on each side, longer towards the 

 base ; third and fourth segments thinly clothed with pale yellow 

 pile, which is longer on the fourth segment. 



Sierra Leone (Foxcroft) : one specimen. 



This species is allied to JR?i. ccendesc?ns, Lw. (' Dipterenfauna 

 Siidafrika's,* p. 302 [374], from Caffraria, but is distinguished at 

 once by the colour of the thorax and abdomen. 



