the Boiiilitfliiil Fiunni <>f South Africa (Diptera). 101 



Type ( , a single specimen from Transvaal, Barberton, December, 

 191 ft (H. Edwards ); a damaged male specimen from Basutolaiicl, 

 Likhoele (Dieterlcn) seems also to belong here, but has the knob of 

 halteres entirely whitish above. 



J 1 . Length of body 6 mm. ; of wing 6 mm. ; of wing spread 13 mm. 

 Head black ; eyes in profile much narrowed above and touching for a 

 very long line, even longer than in barbatns ; the hairs of occipital 

 border and of vertex are scarce, short, darkish ; ocellar tubercle black 

 and very small ; frontal triangle very small and grey-dusted. Face 

 very narrow, a little prominent, clothed with dense, whitish tomeutum, 

 quite bare even on the sides ; the genae with scai'ce, white hairs which 

 are directed forwards ; lower part of the occiput with long white 

 hairs. Antennae entirely black ; first joint long and thin, not broader 

 than the third, with scarce, short, darkish hairs ; second joint globular, 

 third joint linear, gradually tapering into a long point ; it is twice as 

 long as the first. Proboscis black, l - 5 mm. long ; palpi black. Thorax 

 and scutellum dull black, the former more gibbose than in the two 

 preceding species ; the hairs are whitish, and the short dust below 

 them is whitish, not golden; no distinct bristles. Squamulae whitish, 

 with yellowish border and with white marginal hairs ; halteres 

 yellowish, with the knob black above. Abdomen black, narrowly 

 yellowish at base of venter, and clothed like the thorax ; genitalia 

 entirely reddish. Legs in the greatest part reddish, only the four fi'ont 

 femora being more or less blackened ; the coxae are reddish on the 

 apical half; hairs and dust whitish. Wings greyish-hyaline, iridescent, 

 with pale yellowish stigma ; veins dark, with yellowish base. Cubital 

 fork twice as long as broad, obtuse at base, with the upper branch 

 rounded at base, and originating much beyond the upper end of the 

 apical cross-vein of the discoidal cell ; middle cross-vein beyond the 

 middle of the rather elongate discoidal cell, the terminal vein of which 

 is S-shaped but not much oblique. Stalk of anal cell moderately 

 long. 



GrERON DICHROMTJS, Bigot (1892). 



Very distinct from all the other known South African species of the 

 genus on account of its prevalent yellowish colour. 



Described with a query from South Africa, I think that a single 

 male specimen from Aus, S. West Protectorate, 1916 (Dr. Knobel), 

 may be referred to it, even if it has the wings quite hyaline. I give 

 a description of this specimen. 



cJ . Length of body 6 mm. ; of wing 6 mm. ; of proboscis, 2'5 mm. 

 Head black : occiput with scarce and very short dark hairs above like 



