BY FRANK H. TAYLOR. 811 



black, all the segments with the apical margins pale yellowish- 

 brown. 



Legs reddish-brown, clothed with pale hairs, tarsi darker, 

 tibial spurs black, on midlegs fairly long and conspicuous, on 

 hindlegs short and inconspicuous. 



]Vi)i7s with the skeins yellowish-brown on the basal half, the 

 remainder black; stigma pale yellow, elongate, inconspicuous; 

 squamse pale yellow, edges brown; halteres reddish-brown. 



i/a6.— Stapleton, Northern Territory (G. F. Hill; No.36). 



SiLVIUS TRYPHERUS, Sp.n. 



9. Length, 7; width of head, 2-25; width of front at vertex, 

 0-25; length of wing, 6'7 mm. 



Head : front cinereous, densely clothed with minute, grey 

 hairs; face grey, clothed with moderately long, greyish hairs; 

 subcallus grey; frontal callus dark reddish-brown, prominent, 

 nearl}^ as broad as the front at its base, almost resting on the 

 subcallus, and gradually tapering to a blunt point near the 

 ocellar triangle; ocelli shining-brown, inconspicuous; eyes dull 

 black, nude, with their inner margins gradually sloping inwards 

 towards the vertex; antennae with the first two segments yellow, 

 and clothed with fairly long, semi-appressed hairs, third segment 

 with the base light yellowish-brown, clothed with minute, ap- 

 pressed, pale hairs, and forming a broad triangle, annuli dark 

 broWn; palpi yellow, sparsely clothed with semi-erect, black 

 hairs, and slightly more than half the length of the proboscis, 

 the latter comparatively short, dark brown, clothed with erect, 

 brown hairs, fairly long on its apex. 



Thorax reddish-brown, clothed with grey bloom and golden, 

 appressed hairs; pleurae similar to the thorax, thinly clothed 

 with erect, grey hairs; scutellum similar to thorax. 



Abdomen: first two segments reddish-brown, the remaining 

 segments dark brown, clothed with grey bloom, and golden, ap- 

 pressed hairs; venter dark brown, clothed with grey bloom, with 

 fairly long, semi-erect hairs at its apex. 



