﻿136 Aiiiud^ of the South Afr!c(i)i M/ixefon. 



yellowisli ; pleurae black, grey-dusted, reddish aloug the sutui'es,. 

 M'itli whitish hairs and with white scales ; metapleural tuft whitish.. 

 Scutellum red, narrowly bhiek at the base, with yellowish scales and 

 yellow bristles at the hind border. Squamae yellowish with white 

 fringe ; haltères yellow with whitish knob. Abdomen red, with the first 

 seirment black and with a broad median black spot on the second, a 

 smaller one on the ord and a very small one on the 4th ; it is clothed 

 with pale yellowish scales, but on the apical half of the 2nd and 

 on the base of the 5th segment the scales are Ijlack ; it seems that 

 the ]}ers2ncUlaris--pa,ttern is white and well developed ; the hairs of the- 

 sides are Avhitish and long near the base, whitish and short on the 

 remainder, but there are no black hairs. Venter red with black base, 

 white scales and whitish hairs ; genitalia red, small, asymmetrically 

 placed. Legs lilack, with yellow trochanters, tibiae and base of tarsi ; 

 the femora are only narrowly yellow at end, their scales are Avhitish and 

 the scarce hairs are whitish like those of the coxae ; spines black, middle 

 femora with one very long one, hind femora with six rather short ; 

 front tibiae smooth, the others with rather long and numerous spicules ;. 

 front tarsi very sliort, slenderly pilose, with very small claws ; claws 

 black. Wings whitish hyaline, with a broad pale yellowish base and a 

 brown, fenestrate, median band ; the brown band is thus reduced to- 

 some dark spots on the sides of the three fenestrae and to an ovate 

 spot near the middle of the anal cell ; second basal cell almost entirely 

 yellowish ; veins yellow, only a little darkened at the end ; basal comb 

 with black bristles, but densely clothed with yellow scales ; alula pale 

 yellowish, with Avhitish fringe; axillary lobe short and broad, greyish 

 hyaline. Second longitudinal vein very short, with a well-developed 

 terminal loop ; discal cross-vein long and oblique, placed at about the 

 middle of the discoidal cell ; first posterior cell narrowed at the end ;, 

 discoidal cell narrow, very acute outwards, its apical cross-vein 5-shaped 

 and placed parallel to the hind border of the wing ; third posterior- 

 cell very long, its contact with the discoidal cell more than ten times as- 

 long as that of the fourth posterior with the same cell ; strongly looped 

 at the base; anal cell rather broadly open; second basal cell as long- 

 as the discoidal cell and at end broader than the cell. Upper branch of 

 the cubital fork regularly curved in the middle, rather flat at the base 

 and Avithout appendix. 



Thyridanthrax ternarius, Bezzi. 



Distinguished from all its congeneric species here described bv 

 the regular presence of 3 subnuirginal cells, and by the very extended 

 dark pattern of the wings. 



