M. campbelli n. sp.^* (Plate LI, fig. 1.)

This fly is very nearly identical in form and colour with Helophilus cargilli.

♀. Eyes approximated on vertex, clothed with golden hairs indistinct above but conspicuous in front and below; front widening anteriorly, orange-brown with darker reflections, and clothed with a brownish pile; a medio-longitudinal fissure ending half-way down the front at a transverse, central, brownish area, below which the front has a transversely wrinkled appearance; lunular area orange-yellow but black posteriorly; a blackish area on front just behind lunule. Antennae shaped as in Helophilus; 1st and 2nd joints brownish-yellow to brownish-black; 3rd joint orange-yellow with a silvery reflection and faintly tinged around the border with brown; arista blackish-brown. Outline of face as in Helophilus; face a rich tawny colour, transversely wrinkled, and clothed on each side with tawny hairs; prominence bare, tawny on each side but centrally with a brownish-yellow stripe; oral margin bordered with blackish-brown, this colour narrowing to the anterior angles; cheeks and occiput tawny, the former bearded with tawny hairs; proboscis dark brown, palpi paler.

Dorsum of thorax clothed with short brownish to tawny hairs; 3 longitudinal broad black stripes, the median stripe furcate and the lateral ones interrupted (fig. 80); angles of transverse suture bordered with black; a short narrow and oblique black stripe at wing-articulation; dorsum otherwise tawny; suture from humerus to wing indistinctly black; pleurae black in ground-colour, the meso-, ptero-, and upper part of sterno-pleurae tawny-pruinose and clothed with tawny hairs; the stigmata pale tawny. Legs orange-red with a tawny reflection, except the shiny brownish-black basal part of the femora, all of which are clothed with tawny hairs; the posterior femora not broadened, tapering distally, and with spines below toward apex. Wings faintly tinged basally with yellow; the stigma pale yellow; veins brownish-yellow; vein R_{2 + 3} strongly upturned and curved slightly backward apically (fig. 86).

Abdomen broad and oval (fig. 84), clothed with short tawny hairs except on black parts; 2nd and 3rd segments with large orange-red areas separated from each other and from the posterior margin of each segment by black; on each of these areas centrally is a distinct greyish-yellow circular spot; the orange-red of 2nd segment encroaches over the posterior