68 Annals of the South African Museum. 



the figure also lacks these bristles ; and besides, in the description of 

 A.fuscipennis we read "pedilusfavis," and "petite nervure transversale 

 situfe aux deux t iers " : two characters which applied to A. anoiualus, 

 but not to the present species. It is therefore certain that Macquart 

 had not Sosiomyia before him when describing- Adelidea. 



I have no hesitation therefore in describing the new genus, the name 

 of which (from Sosias and wyia) is an allusion to its deceptive 

 resemblance to Adelidea anomala ; and it is very curious that the 

 present collection has no representatives of the last species, which 

 does not seem to be rare in South Africa. 



Body short and broad, rotund. Head narrower than the thorax. Occi- 

 put rather developed, swollen, provided in the female with bristly hairs. 

 Ocelli disposed in an equilateral triangle, on a little prominent tubercle. 

 Eyes with equally small areolets in both sexes, approximate in the male, 

 very distant in the female ; the frons in the male at the narrowest point is 

 as broad as the distance between the two basal ocelli ; in the female it 

 is one and a half times as broad as the eye, with parallel sides and 

 with numerous bristles. Face broad in both sexes, rounded, less 

 prominent, without bristles, geuae rather narrow, without bristles. 

 Antennae approximate at the base, and of a very peculiar and 

 characteristic shape ; first joint a little, yet distinctly thickened, twice 

 and a half as long as the second, with long hairs directed forwards ; 

 second joint globular ; third as long as the first two together, broad 

 at base in the male, gradually tapering to a point but deeply excavate 

 below near the middle ; in the female the basal two thirds are very 

 broad and ovate, much bi-oader than the second joint, the apical third 

 is abruptly attenuated, linear in both sexes, truncate, with a thin and 

 short style above, and having below near the end a tuft of 7-10 rather 

 long hairs ; near the base it is provided above with 4-6 very long and 

 strong bristles, directed forwards and nearly reaching the end of the 

 joint. Mouth-opening broad and short ; proboscis short, not longer 

 than the thorax, strong, with broad and long, lanceolate terminal 

 labella; palpi concealed. Thorax with very numerous long bristles 

 on fore border (more developed in the female) and on the sides ; some 

 shorter bristles are present even on the back ; pleurae less pilose ; 

 metapleura bare. Scutellum with numerous and long marginal 

 bristles disposed in three irregular rows on the hind border ; abdomen 

 short and broad, with the bristles at the hind border of the segments 

 forming complete rows. Legs stout, with the femora spinose beneath ; 

 tibiae with much developed and strong spicules ; claws curved ; 

 pulvilli as long as the cla,ws. Wings long and rather narrow. 

 Praealar hook short and acute ; basal comb very small, but distinct ; 



