South African Hiylier My odor I i (Diptera Calyptratae). 501 



The resemblance of this species to the genus Eriothrix is only 

 superficial. On the testaceous scutellum obscure at the base are 4 long 

 and robust marginal setae, the apical crossing each other ; the thorax 

 with 3 dc. has in front 2 pairs of acrostical setae only, the hind one is 

 wanting ; on the other hand there are 3 complete pairs at the back of 

 the suture. Sternopleural setae = 2 + 1 . On the vertex there is only 

 the pair of inner, crossed, vertical setae, and a pair of postvertical well 

 developed and arching forwards ; the width of the frons at this level 

 is * of the eye, and its narrowness is the cause of the triangular shape 

 of the frontal band ; the frontal setae reach the inferior third of the 

 2nd autenual joint, which is elongated ; the 3rd joint is not dilated 

 and equal in dimension to the 2nd. The black cheta is thickened at 

 its basal half ; the length is scarcely 1^ that of the antenna ; the 2nd 

 joint is distinct but short. The cylindrical palps do not reach the 

 buccal border, while the somewhat thin and horny proboscis reaches 

 a little beyond it. The moderately wide epistome is about f that of 

 the eye. Higher occiput with 1-2 rows of small black setae behind 

 the ciliae, eyes hairy. The 1st segment of the abdomen is deeply 

 excavated and bare ; the other segments bear 2 or more pairs of setae 

 gathered on the black medio-dorsal band, which does not reach the 

 apex ; the apex of the 4th resumes the uniform testaceous yellow tint, 

 which is also that of the hypopygium. Wings hyaline, uervures almost 

 entirely pallid ; cubitus of the 4th V-shape, and with a short, real 

 prolongation as long as the petiole of the 1st posterior cell ; hind 

 transverse S-shape ; base of the 3rd nervure with 6 ciliae ; costal spine 

 projecting ; squamae whitish ; halteres dark. The petiolate posterior 

 1st cell, and the projecting costal spine induced Brauer and 

 Bergenstamm to include this species in the genus Eriothrix Meig. ; but 

 it is evident that all the other characteristics militate against this 

 opinion, and lead to the genus Erestia R. D. The external shape of 

 the hypopygium (unprepared) seems to confirm this conclusion ; in a 

 fourth $ example which I just examined the 1st hind cell of the wing 

 is broadly open. 



PYRRHOSIELLA, u. gen. 



Fig. 7. 



Eyes bare, distant, the width of the frons at the vertex is f that of 

 the eye. No ocellary setae, no external vertical setae ; 1 orbital seta 

 only directed forwards ; the frontal ascending setae number 3, 1-2 

 advancing on the genae as far as the middle of the 2nd antennal club. 

 Head high ; face vertical, a little concave, with long antennae, the 3rd 



34 



