On the Bonibyliid Fauna of South Africa (Dipteral). 01 



yellow, with white knobs. Abdomen ovate, red, the two first segments 

 and the middle of the third black ; it is clothed with dense, whitish, 

 depressed pubescence ; at the hind border of each segment there is a 

 broad band of erect, pale yellowish hairs, but there are no distinct 

 bristles ; the long abdominal fur appeal's thereby to be disposed on 

 5 parallel rows alternating with tomeutose bauds ; venter red, with 

 short whitish hairs ; genitalia i'ed. Legs entirely reddish-yellow, even 

 on the coxae and at the end of the tarsi ; they have whitish scales and 

 very scarce pale hairs on the femora ; middle femora with 4, hind 

 femora with 6 yellow spines xinderneath ; spicules of the tibiae yellow, 

 those of the front pair very minute ; claws red, with black end ; 

 pulvilli narrow, dirty-whitish, shorter than the claws. Wings short, 

 with a faint yellowish tinge on the basal half ; veins yellow ; basal 

 comb very small, pale yellowish ; alula broad, rounded, hyaline with 

 pale fringe. Upper branch of the cubital fork arched in the middle 

 and much retreating at base ; discal cross-vein on the middle of the 

 short and broad discoidal cell, which is of triangular shape, with the 

 two lower veins of nearly equal length ; first posterior cell narrowed at 

 end, but the second posterior cell not triangular ; apical cross-vein of 

 the discoidal cell much longer than the discal cross-vein. 



A very small female specimen (only 4 mm. in length) from Nama- 

 qualaud, O'Okiep, 1885 (L. Pt'riuguey), has the frous with parallel 

 sides and about as broad as the eye ; the thorax is black on the back, 

 with 4 longitudinal greyish stripes, 2 of which are on thedorso-ceutral 

 lines and 2 on the sides ; abdomen with rather distinct pale yellowish 

 bristles at hind border of the segments. 



DISCHISTUS NIVEUS, Macquart (1840). 



A small species, very distinct on account of its entirely black legs 

 and its white fur. 



Macquart described the male from the Cape, but without mentioning 

 the colour of the legs ; from his short description it seems to be a 

 species of Goitartherus, but the position of the discal cross-vein 

 differs. I refer to this species a female specimen from Bushmanlaud, 

 Jackal's Water (Cape), October, 1911 (K. M. Lightfoot). 



Length of body 6 mm. ; of a wing 5 - 5 mm. Head, thorax, scutellum 

 and abdomen black, grey-dusted and clothed with a short golden 

 tomeutum, which is silvery only on the face and at the hind borders 

 of the eyes. All the hairs are long, but rather sparse, of a silvery 

 white colour ; on the pleurae there is no golden tomentum, only white 

 scaly hairs and no distinct bristles between the hairs. Frons much 



