178 On Diptera from South Africa. 



Wings clear, veins brown ; yellowish at the base and the 

 whole of the first longitudinal vein. 

 Length 10£ millim. 

 Type (male), Pretoria {W. L. D.). 



Lophonotus albofasciatus, g , sp. n. 



Two males from Pretoria (IF. L. D.). 



Belongs to division I. 2. a of Loew. The abdomen with 

 bristles before the segmentations, the underside with bristles, 

 the thorax with long hairs or bristles reaching to the anterior 

 border. 



Brown. Face pale yellow ; moustache black, reaching to 

 the antennae, a few white hairs on the upper half. Forehead 

 brown anteriorly, fawn-coloured posteriorly, with black bristles 

 and a few white hairs near the antennae. Beard white. An- 

 tennae black. Palpi black, with black hairs. Hind part of 

 head bordered with black bristles, then white hairs. Thorax 

 bronze-coloured, with some white tomentum on the sides, 

 stripes indistinct ; the mane composed for two thirds of its 

 length of short black hairs, the last third of longer white 

 hairs, on its whole length bordered by black bristles, thicker 

 at each end ; some short white hairs are scattered on the sides 

 and posterior border. Scutellum the same colour as the 

 thorax, clothed with long white hairs and a double row of 

 long black bristles. Abdomen with a black central stripe and 

 irregular black spots, and reddish-brown tomentum on the 

 sides ; the pubescence on the first segment consists of long 

 white hairs in the centre and black ones at the sides ; else- 

 where the pubescence is black, except at the sides of the 

 apical half, where are some white hairs; the bristles are 

 black ; the genital organ brown above, red below, with black 

 and white pubescence, longer on the underside ; the underside 

 of abdomen brown, with some greyish tomentum. 



Legs black, metallic, the basal half of the tibiae chestnut- 

 brown ; the bristles black, with the exception of some on the 

 apex of the tibiae and on the first three joints of the tarsi, 

 which are white ; the pubescence of legs white, thickest on 

 the tibiae and tarsi. Halteres brown. 



Wings clear ; veins brown, red on the fore border. 



Length 15^ millim. 



Type (male), Pretoria (W. L. J).). 



One specimen is labelled " Caught while attacking common 

 Geometer, Sept. 1895." 



