148 F. W. EDWARDS. 



frontal callus ; borders rather paler. Frontal callus moderately broad, shining- 

 blackish-brown or dark brown, not much wrinkled, its upper margin rather strongly- 

 convex ; it touches the eyes for some distance, but separates slightly in the upper 

 part. Spot below callus rounded, velvet-black. Antennae dingy reddish-brown, 

 extreme base of third joint grey, especially on the upper surface, terminal annuli 

 black. First joint not shining, scarcely thickened, about four times as long as its 

 greatest breadth. Palpi pale greyish, clothed with black and whitish hairs, the former 

 most numerous towards the apex. 



Thorax dark brownish, more greyish towards the front, the three pale stripes only 

 extending a short distance from the front margin and not very distinct ; post-sutural 

 spots distinct. Scutum with short black hair and pale yellowish close-lying pubes- 

 cence, the latter much denser in a transverse band just in front of the scutellum, 

 accentuating to the naked eye the conspicuousness of the gi'ey markings in this position. 

 Scutellum dark brownish, clothed with black hair. Pleurae light grey, with white 

 jhair. 



Abdomen rather dark brown, more reddish-tinged basally ; second segment paler 

 in the middle, third to sixth with pairs of somewhat elongate pale spots ; lateral and 

 posterior margins of segments light brownish and with some pale pubescence, the 

 pubescence elsewhere on the dorsum being black. Venter dusted with grey, yellowish 

 basally, pubescence pale, except on the last segment where it is longer and black. 



Legs : Front coxae hght greyish, remainder of legs black, tibiae distinctly swollen, 

 with a white ring at the base. Middle legs brownish, tarsi darker, except for the pale 

 base of the metatarsus ; tibiae with two distinct and equally broad whitish rings. 

 Hind legs blackish, femora hghter towards the base, tibiae slightly thickened, with 

 one rather broad white ring at the base, no trace of a second ring ; fringe of black 

 hair on the outer side shghtly longer than usual, as long as the width of the tibia ; 

 basal half of metatarsi pale. 



Wings greyish brown with white markings ; no darker clouds ; no conspicuous 

 pale patch at the anal angle. Squamae coloured hke the ground colour of the wings, 

 Halteres light yellowish, base of knob somewhat darkened. 



Length, 10 mm. ; wing-length, 9-5 mm. ; width of head, 3-2 mm. ; width of front 

 at vertex, I'O mm. (measurements of type). 



Nyasaland: Ngara, i.l915 {Dr. J. B. Davey), 1 ? (type). N.E. Rhodesia: 

 Luangwa Valley, Petauke, 2,400 ft., 22.1.1905, 4 ?, and 8-9.1.1908, 2 ? {S. A. 

 Neave). 



The Rhodesian specimens are on the average rather larger than the type, and the 

 first antennal joint is a Uttle shorter, but there can be no doubt that they belong to the 

 same species. They are very much rubbed and so do not show the band of pale 

 pubescence on the thorax. 



H.fasciatapex is nearly related to H. divisapex, Aust., and H. insatiabilis, Aust., 

 but differs in the longer and more slender first antennal joint, in the absence of any 

 trace of a second pale ring on the hind tibiae, and in the absence of a white patch at 

 the anal angle of the wing ; also in the more conspicuous pubescence of the thorax. 



