﻿On flit' BoDthi/ftid Fauna of Soiif/i Africa (Dlptera). 99 



to note that besides tlie widely spread (t. In/liridns, all tlie other species 

 belong to tlie group in which the cubital tork is long and narrow ; 

 this group seems therefore to l)e characteristic of the South African 

 fauna. The species may be distinguished as follows : 



1 (2). Wings x>i"oi3ortioiially short, with the cubital fork sliort and broad, 



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

 length . .... hybridus, Meig. 



2 (1). Wings more ehingate, with the ciibital fork long and narrow, the 



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



3 (8). Antennae entirely black; coxae black; haltères with black knob, at 



least above in the male ; abdomen quite black. 



4 (7). First antenna! joint distinctly tliickened and clothed with dense and 



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



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



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



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



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



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



barbate ...... Icptoceriif!, sp. nov. 



8 (3). Hasal joints of antennae, co.xae and aljdomen yellow ; knol:) of haltères 



entirely yellowisli ..... dic]ir,)inns,'Big. 



GrERON HYBRIDUS, Meigen (1804). 

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

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

 (L. Péringuey), 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 Knysna, October, 1916 (L. Pcringuey). 



Geron luctuosus, sp. nov. 



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

 account of its strongly infuscated wings. 



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



tJ , $ . 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 Avith long, erect, black hairs. Eyes of male 

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

 this line is tAvice 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 



