140 Annals of the South African Museum. 



:* (2). Metapleural tuft entirely yellowish; antennal style well developed, 

 but short and stout ; species of greater size . affuscata, sp. nov. 



4 (1). Wings with a dark base and a dark fore border, but hyaline in th<- 



remainder, with distinct spots or reticulation. 



5 (6). The veins at the hind border of the wings are provided with fuscous 



confluent borders ; anal cell entirely infuscated . personata, sp. nov. 



6 (5). The veins of the hind border with isolated dark spots ; anal fell 



hyaline at end, with a dark spot before the end . anyulata, Loew. 



EXOPROSOPA (ACRODISCA) FIMBRIATELLA, sp. nov., ? . 



A black species of small size, prevalently Mack-haired, with entirely 

 fuscous wings and with rudimentary antennal style. 



Type 9 > a single specimen from Potchefstroom, Transvaal (T. 

 Ayres). The species seems to be closely allied to nwbrosa, Loew, but 

 is distinguished by the different antennae and by the different shape 

 of the discoidal cell. 



Length of body 8-8'5 mm. ; of a wing 8'5-9 mm. Occiput black, 

 with pale yellowish central fringe and yellowish scales at the eye 

 borders ; postvertical furrow narrow; eyes with faint indentation and 

 a short bisecting line ; ocellar tubercle flat and of brownish colour ; 

 frons entirely black, rather narrow, with bluck erect hairs and pale 

 yellowish scales in front ; face conical and much prominent, entirely 

 black, clothed, like the frons, with a black tuft on the upper edge ; 

 mouth borders yellowish. Antennae with the first joint red, black- 

 haired ; the second half as long as the first and black ; the third 

 elongate, linear, black, obtuse at end, with a very minute, rudimentary 

 style situated at its npper corner. Proboscis Mack, as long as the 

 mouth ; palpi black, with pale hairs. Thorax entirely black, with 

 black hairs and black scales, and with a stripe of yellowish hairs on 

 the sides ; the collar is yellow above, black on the sides and below ; 

 the rnacrochaetae are well developed and black ; pleura black-haired. 

 \vith only a tuft of yellow hairs on upper border of the mesopleura ; 

 metapleural tuft entirely black ; steriiopleura reddish above. Squamae 

 blackish brown, with a dark fringe ; halteres black, with paler knob. 

 Scutellum red, with black base, black scales and black bristles. 

 Abdomen black, narrowly reddish on the sides of the 2nd and 3rd 

 segment ; it is clothed for the greater part by black scales, but the 

 base of the second segment has a narrow complete band of white 

 scales ; sides of other segment with some white scales and with yellow 

 scales at the hind border. First segment clothed with erect yellowish 

 hairs, which form a characteristic complete fringe ; all the sides, 



