490 Annals of the South African Muse-inn. 



CHAETOLYDELLA NATALENSIS, 11. sp. 



Face with whitish sheen ; antennae testaceous, more or less 

 darkened on the 3rd joint ; auteuiial chaeta dark, thickened at the 

 base; palpi moderately thick, pale testaceous ; proboscis not elongated, 

 fleshy, with thick labella, wholly testaceous. Orbits equal in width 

 (c?) or wider (?) than the blackish frontal band, ashy like the thorax 

 and the scutellum ; thorax with 2 black dorsal bauds, remote from 

 each other and duplicated in the inner side with a narrow line of the 

 same colour ; shoulders and free edge of the scutellum rufescent. 

 Abdomen testaceous red and with a broad black medio-dorsal baud 

 slightly hidden by pruinose down forming undefined transverse bands 

 with whitish sheen. Segment 1 of abdomen deeply excavated and 

 bare ; segment 2 with 2 marginal median setae ; segment 3 with an 

 entire row ; segment 4 with 2 complete rows, the one discal, the other 

 subapical. Hypopygium retracted, testaceous, the forceps dark. 

 Wings hyaline in the basal half with the uervures yellowish, greyish 

 beyond the middle with the nervure surrounded by a broad brownish 

 border ; no costal spine. Squamae cream colour, halteres pale testa- 

 ceous like the coxae, the rest of the legs bright testaceous except the 

 tarsi, which are black. 



The 9 is distinguished from the $ not only by its somewhat wider 

 frons and the minute claws of the tarsi, but also by its darker colour ; 

 the black band of the abdomen spreads broadly as far as the sides. 

 Length 12-13 mm. 



Many examples from the Cape ; Natal, Durban (H. W. Bell- 

 Marley; W. Haygarth); Transvaal, S. Afric. Museum; Nyassaland, Mt. 

 Mlauje (S. A. Neave), Entom. Ees. Comm. 



LYDELLINA, n. gen. 



& 



Fiir. 4. 



I identify as Lydellina cajj'rci Macq. a series of examples varying 

 in size according to localities, and having the abdomen as described and 

 figured by Macquart ; but, contrary to Mac-quart's statement, the face 

 has a border of small, spaced setae ascending more or less high. 

 Nevertheless, I think I am justified in preserving the name of the 

 species, because these setae vary in number, and are even absent in 

 small individuals from the Gold Coast, The characters of the new 

 genus are as follows : 



In both sexes the eyes are about equally distant, On the frons are 

 2 orbital setae ; its width at the vertex equals f of that of the eye 



