South African Higher Myodari! (Diptera Calyptratae). 505 



4 obscure, segments 2 and 3 covered with pruinose, moderately thick 

 bright ashy grey down sectioned by a black, medio-dorsal black line. On 

 segment 2 a bare, reddish posterior band with obscure sheen, impinges 

 on the pruinose down on each side of the median line, advances to the 

 neighbourhood of the anterior border, and forms there 2 changing, ill- 

 defined spots visible only in certain light. On the sides the colour is 

 pale red on the first 3 segments, which on the venter side are edged 

 behind with brownish and clothed with a thick whitish pruinose down ; 

 4th segment wholly obscure. Head as in Phorostoma subrotundatwn 

 Bond. ; and with the antennae also obscure-testaceous at the base ; 

 palpi testaceous. Thorax ashy and with the same bands ; wings 

 identical, 4 dorso-central setae on the thorax ; 1 pair of long, median 

 marginal setae on abdominal segment 2 ; segment 1 bare. Legs black ; 

 anterior claws equal in length to that of the last tarsal joint ; posterior 

 tibiae moderately regularly ciliate with a long median black seta. 



Length 9-11 mm. 



Several <? examples from Natal, S. Afric. Museum. 



OXYMEDORIA, n. gen. 



Fig. 8. 



This new genus is founded on a black species annulated with white 

 on the abdomen, and belonging to the same group of Pseudodexiidae 

 degeeriaeformes. 



? . The proboscis long, thin, directed forwards, palps a little thick- 

 ened and projecting in front of the mouth. Face oblique and slightly 

 concave ; f rons prominent ; genae growing linear below, like the peri- 

 stome. Antennae elongate, with a long and fine chaeta thickening 

 towards the base and carrying ciliae longer than the diameter at its 

 widest part. Two orbitary setae ; 1 pair of vertical setae, the iuuei 

 crossed with that of the opposite side ; 1 single frontal seta above the 

 insertion of the antennae ; ocellary setae wanting, or piliform. Thorax 

 with 2 pairs only of short and weak acrostical setae as in Pyrrhosiella ; 

 3 dorso-central setae ; sternopleural ==2 + 1, the antero-inferior weak, 

 in addition to the lateral seta and the long subapical setae the scutellum 

 bears a pair of less long, crossed apical ones. Abdomen similar to that 

 of the preceding species, but with a pair of discal setae on segments 

 2 and 3. On the 4th, the example has one discal seta only ; this seems 

 to point to the marginal setae alone being constant. Wings with a 

 costal, projecting, moderately long spine, the cubitus of the 4th nervure 

 obtuse and sub-rounded ; the posterior cell open almost to the apex of 



