On t/i>' Pini/lii/liid Fauna of South Africa (Diptera). 99 



to note that besides the widely spread G. hi/briclua, all the other species 

 belong to tlic group in which the cubital fork is long and narrow; 

 this group seems therefore to lie characteristic of the South African 

 fauna. The species may be distinguished as follows : 



1 (2). U'iii^-s proportionally short, with the cubital fork short and broad, 



the second submarginal cell being at end about as broad as its own 

 length . .... hybridus, Meig. 



2 (1). Wings more elongate, with the cubital fork long and narrow, the 



second marginal cell being at least twice as long as broad at end. 



3 (S). Antennae entirely black; coxae black; halteres with black knob, at 



least above in the male ; abdomen quite black. 



4 (7). First antennal joint distinctly thickened and clothed with dense and 



long hairs ; cheeks clothed with very long and dense hairs. 



5 (6). Wings hyaline, eyes of male touching in a long line, the frontal 



triangle being small, triangular, grey dusted . barbatus, Bezzi. 



6 (5). Wings strongly infuscated ; eyes touching for a short line, the frontal 



triangle being broad and deep black . . luctiinsus, sp. nov. 



7 (4). First antennal joint very thin and scarcely haired; cheeks not 



barbate . ... leptorerus, sp. nov. 



8 (3). Basal joints of antennae, coxae and abdomen yellow ; knob of halteres 



entirely yellowish ..... dichromus, Big. 



GERON HYBRIDUS, Meigeii (1804). 



This Mediterranean species is not rare in South Africa ; S. Rhodesia, 

 Salisbury, May, 1917 (R. W. E. Tucker); Cape Colony, O'Okiep 

 (L. Periuguey), Transvaal, Barberton, December, 1916 (H. Edwards). 



GERON BARBATUS, Bezzi. 



Very distinct by the barbate jowls and by the hyaline wings. 

 Described from the Cape in my work on the Bombyliidae of the 

 British Museum ; there are specimens from Cape Colony, O'Okiep 

 and Kuysiia, October, 1916 (L. Periuguey). 



GERON LUCTUOSUS, sp. nov. 



Closely allied to the preceding species, but at once distinguished on 

 account of its stronglv infuscated wiu^s. 



o t/ 



Type J and type $ from Basutoland, Maseru (Mrs. Dieterlen). 



c , 2 . Length of the body 5-6 mm. ; of the wing 5-6 mm. ; of the 

 wing spread 12-14 mm. Head black, with a dark grey dust ; occipital 

 border above and vertex with long, erect, black hairs. Eyes of male 

 touching for a line as long as the ocellar triangle, while in barbatus 

 this line is twice as long and more ; they are narrowed above, the 

 head in profile presenting the characteristic outline of the o-enus 

 eyes of female broadly separate. Frons grey dusted, broadening 



