300 ERNEST E. AUSTEN — NEW AFRICAN TABANINAE. — PART IV. 



from that described above owing to conspicuous differences in the marking of the 

 thorax, abdomen, and wings. In Holcoceria nobilis, which is often considerably 

 larger than the specimens of Haematopota nigripennis at present available for 

 comparison, the markings of the dorsum of the thorax, instead of agreeing with 

 those shown in fig. 5, consist simply of two continuous and converging light grey 

 longitudinal stripes, which run without a break from the front margin to the 

 praesutural furrow ; in H. nobilis, too, the dorsum of the black abdomen is 

 entirely devoid of grey transverse bands, but is uniformly covered with a thin 

 greyish bloom, beneath which a trace of paired grey spots is sometimes visible 

 when the abdomen is viewed at a low angle from behind ; and lastly, in the same 

 species the clove-brown wings are entirely unicolorous, with the exception of a 

 milk-white transverse band just before the tip. There are no structural 

 differences to separate Holcoceria, Griinb. (loc. cit., p. 357, — founded for II. nobilis, 

 Griinb.), from Haematopota, Mg., and, remarkable though it be that there should 

 exist a Haematopota, without the well-known characteristic wing markings, the 

 discovery of the species described above renders it impossible any longer to 

 maintain the generic distinctness of Holcoceria, so that Holcoceria nobilis, Griinb., 

 must henceforth be assigned to Haematopota, and the genus Holcoceria must be 

 abolished. 



