Asilus alastor, Francis Walker, 1849

Francis Walker, 1849, List of the specimens of dipterous insects in the collection of the British Museum, London: British Museum (Natural History) : 444-445

ASILUS Alastor , n. s., mas.

Oinereus, thoracis vittis duabus latis albidis, pectore albo, abdomine cano unifasciato apiceque pilis afrgenteis ornato, antennis nigris, pedibus cinereis, alis limpidis.

Body dark gray: head as broad as the chest, clothed behind and beneath with white hairs, furnished with a few black hairs on the crown; clypeus thickly armed with long white bristles: eyes large, dark bronze; fore part nearly flat, its facets rather large: lip and palpi black, the latter clothed with short black bristles; first and second joints of the feelers black, and clothed with black hairs; second joint shorter than the first: chest with two broad whitish stripes on the disk, clothed with short black hairs, and beset on each side with black bristles: breast white, and thinly clothed with white hairs: abdomen tapering from the base to the tip, rather narrower than the chest, and much more than twice its length, clothed with short black hairs, adorned with a broad hoary band just beyond the middle, and with a tuft of silvery white hairs at the tip: legs dark gray; hips hoary; thighs armed beneath with black spines; shanks and feet beset. with black bristles; claws black; foot-cushions piceous: wings colourless, not reaching when closed beyond twothirds of the length of the abdomen,' wing-ribs piceous; veins black, piceous at the base; poisers piceous. Length of the body 9 lines; of the wings 10 lines.

a. South Africa. Presented by Dr. A. Smith.