On tJie Bombyliid Fauna of Sonlli Africa (THpffra}. 157 



F. GROUP DIMIDTATA. 



EXOPROSOPA (EXOPROSOPA) SIGMOIDEA, Bezzi (1912). 



This species has the venation of lieros, but without the lowei 1 dilata- 

 tion of the diseoiclal cell, and the wing pattern as in dux, but more 

 intensive and more defined. 



Originally described from Western Nvassaland. There are some 



O *> 



specimens from Smithfield, 1910, Orange Free State (D. R. Kanne- 

 meyer), and from Dunbrody, Uitenhage (Cape), March, 1912 (J. A. 

 O'Neil). 



EXOPROSOPA (EXOPROSOPA) DIMTDIATA, Macquart (184G). 

 Dipt. Exot. Suppl. i, p. 107, pi. ix, fig. 11. 



A species very distinct on account of its wing pattern and of the 

 silvery abdominal pubescence of the male. 



Widely spread in South Africa. There are specimens from Natal, 

 Pine Town, 1885 (J. H. Barber), named "Anthrax dimidiates, Macq.," 

 by Bigot ; Beehuanaland, junction Crocodile-Marico Rivers, February, 

 1918 (R. W. E. Tucker) ; Otjituo, Damaraland, January, 1920 

 (R. W. E. Tucker). 



EXOPROSOPA (EXOPROSOPA) DILATATA, sp. nov., $ . 



A species of large size, distinguished by the prevailing black colour 

 of the thoracical hairs and by the dilatation of the discoidal cell. 



This characteristic species seems to be common in South Africa ; it 

 is almost certain that the female described by Loew (/. c., p. 226), and 

 which I have previously referred with doubt to my discriminata, is the 

 same species. There are in the collection numerous specimens from 

 M'Fongosi, Zululand, February, 1912 (W. E. Jones); Barberton, 

 Transvaal, December, 1911 (H. Edwards) ; Smithfield, Orange Free 

 State (D. R. Kannemeyer) ; Dunbrody, Uitenhage (Cape), 1899 (J. A. 

 O'Neil). I have also received it from Grahamstown. 



Length of the body 14-16 mm. ; of a wing 14-16 mm. Head black, 

 dark reddish on fore half of frons and on the face, genae and mouth 

 borders ; occiput dark grey-dusted, with yellowish central fringe, 

 yellowish ocular stripe, and a deep postvertical furrow r ; vertex 

 separated from the occiput by a deep depression ; eye indentation less 

 pronounced, but bisecting line elongate; frons at vertex more than 

 three times as broad as the dark brown ocellar tubercle, with short, 



