Diptera from South Africa, 103 



rovercil by tlicni, and in some specimens there are a few 

 scattered ones on tlic jiostcrior borders of the ini(kllc seg- 

 ments; pubescence bhick : the underside is black with tlie 

 posterior margins narrowly red, tlie pubescence consisting of 

 long black hairs and some groyisli tonientum. Legs black. 



Wiiig.^ dark l)r()\vn, becoming lighter on the posterior 

 border, with a light spot in the second basal cell; tliere is an 

 irregular long, narrow, char stripe in the centre of the 

 discal and anal cells, the apex of the wing is quite clear; 

 there are spots of darker shading on the anterior part of 

 the vein between the first and second submarginal cells, 

 on the root of the fore branch of the third longitudinal 

 vein, on the upper part of the vein dividing the discal from 

 the second posterior cell, a faint one on the base of the nerve 

 between the second and third posterior cells, one at the base 

 of the inner part of the third posterior cell, and one on 

 the cross-vein dividing the second basal cell from the fourth 

 posterior, one encloses the cross-vein between the third 

 and fourth longitudinal veins, and one occui's at the base 

 of the secor.d longitudinal vein ; in some of the specimens 

 there is a faint spot on the end of the second longitudinal 

 vein ; veins brown, the small cross-vein is in the centre 

 of the discal cell, and the root of the second longitudinal is 

 just below it; the first posterior cell is half as wide as the 

 second posterior at its opening, the third at its opening is 

 only a little wider than the second and about the same width 

 as the iburth. 



Length 12 millim. Some of the specimens measure only 

 9 millim. 



Types (male and female), Pretoria (JV. L. D.). 



The female type has an extra faint spot on the end of the 

 upper branch of the third longitudinal vein, besides one on 

 the end of the second longitudinal. 



Length 9 millim. 



Hyperalonia. 



Rondani, Avchiv. Zool. Canestr. iii. p. 57 (1863) ; Osten Sacken, 

 Biol. Ceutr.-Am., Dipt. i. pp. 78-80 (188G). 



In this species a tooth at the base of the ungues on the 

 posterior legs is present, as in Exoprosopa, so that the 

 aljsence of these cannot be taken as a characteristic of 

 the genus, as suggested by Osten Sacken in Biol. Centr.-Am., 

 where he remarks that no species from the Cape had yet been 

 discovered. 



