112 Annul* of tJie Sfinfh African Museum. 



1 (2). Wings narrow and long, with the tipper branch of the cubital fork 



angulate at the base and there provided with a recurrent veinlet; 

 discoidal cells three times as long as the second posterior cell and 

 very acute outwardly : third antennal joint in the shape of a very 

 long, acute cone, linear ; praesutural macrochaetae black ; hind femora 

 with many spines below. (First group) . acutangula, IiOew. 



2 (1). Upper branch of cubital fork not appendiculated and discoidal cell not 



more than twice as long as the second posterior cell ; third antennal 

 joint not linear. 



3 (14). Third antennal joint broad at base and afterwards forming a verythiii 



and long stylif'orm point : wings with a more or less extended pattern, 

 with a distinct basal comb ;md with a rather long discoidal cell; 

 praesutural bristles yellow; hind femora with many spines below. 

 (Second group.) 



4 (9). Species of great si/e, with the wing pattern extended to the hind 



border, and with clear stripes on the fuscous middle area ; anal cell 

 with narrow end. 



5 (6). Legs entirely yellow ; wings infuscated, with a whitish end, and a 



whitish, longitudinal middle st . longitudinalis, Loew. 



6 (5). Legs entirely black, or with dark-yellowish tibiae or base of tarsi. 



7 (8). Wings with the fore basal half infuscated and the hind half clear 



with broad fuscous borders of the veins ; body pubescence pale 

 yellowish; tibiae with yellow ground-colour . liturata,~Loew. 



8 (7). Wings yellow and brown on the disc, with a broad brown, praeapical 



band and a brown hind border ; pubescence bright yellow or golden ; 

 tibiae black . . . . pictipennis, Wied. 



9 (4). Wing pattern limited to the fore border, not extending in the middle 



over the fourth longitudinal vein; if the hind border is infuscated, 

 there are no clear stripes in the middle ; anal cell less narrowed at 

 end ; species of medium size. 



10 (11). First basal cell infuscated at the base only and first submarginal cell 



entirely hyaline in the male; antennal tuft with black hairs on the 

 inside ... ... simplex, Wied. 



11 (10). First basal cell entirely darkened as far as the discal cross-vein in 



both sexes and first submarginal cell darkened at base. 



12 (13). First posterior cell not narrowed at end; wings with the hind half 



rather infuscated . . infuscata, sp. nov. 



13 (12). First posterior cell much narrowed at end ; wings with the hind half 



quite hyaline ... . conocephala, Macq. 



14 (3). Third antennal joint in the shape of a short cone; wings entirely 



hyaline, without basal comb ; thorax with black praesutural bristles 

 and provided with a distinct collar of black bristly hairs in front ; 

 hind femora with a few bristles below ; smaller species, of a deep 

 black colour, with silvery hairs on abdomen. (Third group.) 



15 (16). Tibiae yellow; pubescence on pleurae and abdomen of a yellowish 



colour ... . latmscula, Loew. 



16 (15). Tibiae black; pleurae and abdomen with white pubescence. 



tenera, Loew. 



