﻿ioO Avnals of the South African Museum. 



1820. The species seems to be an exclusively South African one- 

 There is in the collection a single male specimen from Kalk Bay (Cape) 

 (R. M. Lightfoot). 



OESTRANTHRAX, Bezzi (1912). 



This very interesting genus was clescril)ecT by me in my paper on 

 the African Bombyliidae of the British Museum for the type Anthrax- 

 obesus, Loew. The main characters of the genus are to be found in 

 the broad and long facial plate, in the reduced mouth pai'ts and in the 

 absence of thoraeical macrochaetae. 



Oestranthrax obesus, Loew, 1863. 



A specimen from Cape Town, 1880. The species was described 

 from South Africa, and some allied forms occur in other parts of tlie 

 Ethiopian region. 



SYNTHESIA, gen. uov. 



I have to make a new genus for a species which shows a very strange 

 combination of characters, connecting the Lomatiinae with the 

 Exoprosopinae ; it is aberrant like Chiasmella, but is closely allied 

 to the preceding genus Oestranthrax as well as to the genus Herni- 

 penthes. It may be defined as an Exoprosopine with 2 submarginal 

 cells, with spinulose front tibiae, with bluntly convex face, with no 

 developed macrochaetae, and with the second longitudinal vein 

 originating before the middle cross-vein. In this last character the 

 new genus Synthesia is drawing near to the Lomatiinae, while in the 

 general conformation it is receding from them. It may be characterised 

 as follows : 



Body of oval shape, briefly pilose, not bristly at all. Head a little 

 narrower than the thorax ; occiput bilobate above, with a deep 

 central cavity, and depressed between the eyes ; central fringe 

 complete, dense and short. Eyes separated in both the sexes, but the 

 frons of the female always about twice as broad as that of the male ; 

 thev are broadly indented at the hind border, but the bisecting line is 

 less distinct. Ocellar tubercle rather prominent, elongate, with 3 

 equidistant ocelli. Frons quickly broadening in front beyond the 

 middle ; face bluntly convex, but very prominent ; in a front view the 

 face is narrowed beneath, and thus its broader line is to be found just 

 below the root of antennae. Antennae set very widely apart from 

 each other at base and inserted above the middle of the eyes ; the 

 2 basal joints are very short; the thii'd joint is elongate conical, 



