22 PROF. M. BEZZI. 



1. Spheniscomyia sexmaculata, Macquart (1843) ; Bezzi, Mem. Ind. Mus., iii, 

 p. 148, pi. x, fig. 53. 



This easily recognisable species is known from many localities in the Ethiopian 

 region. There are some specimens from Nyasaland, Chiromo, Ruo R., May 1916 

 (R. C. Wood) ; and I have received numerous specimens from Erythraea, Ghinda, 

 October-December 1916 {Dr. A. Mochi). 



XXIV. Tephrella, Bezzi (1913). 



Originally proposed by me for an Indian species ■with only 2 scutellar bristles, 

 with ill-developed costal bristle, and with ^4ct'wra-like pattern of wings with 3 

 hyaline spots in the middle. I adopt it here for a very homogeneous group of 

 African species, which has 4 scutellar bristles, well developed and often double costal 

 bristle and no hyaline spots in the middle of the wings. All the known species 

 have been found also in Erythraea, and they may be distinguished as follows : — ■ 



1(10). Apex of the wings devoid of hyaline spots. 



2(7). In the second posterior cell there is a single hyaline indentation. 



3(6). Apical half of the submarginal cell entirely black, without hyaline spot ; 

 costal cells margined with black. 



4(5). The second hyaline indentation of the fore border is not united with the 

 middle indentation of the hind border . . . . bezziana, Enderl. 



5(4). The second hyaline indentation is united with the middle one, thus forming 

 a single hyaline band in the middle of the wing extending from the 

 fore to the hind border . . . . . . . . . . nigricosta, Bezzi. 



6(3). Apical half of the submarginal cell with a broad hyaline spot just before 

 the end of the second longitudinal vein ; costal cells not margined with 

 black . . . . . . . . . . . . . . cyclopica, Bezzi. 



7(2). Second posterior cell with 2 hyaline indentations, or with a second broad 

 hyaline spot. 



8(9). Third posterior cell with a single hyaline indentation, as usual ; abdomen 

 wholly black . . . . . . . . . . . . tephronota, Bezzi. 



9(8). Third posterior cell with a broad hyaline spot besides the indentation; 

 abdomen wholly red . . . . . . . . . . rufiventris, sp. n. 



10(1). Apex of the wings with a broad hyaline spot between the ends of the 3rd 

 and 4th longitudinal veins . . . . . . . . hessii, Wied. 



1. Tephrella bezziana, Enderlein, Zool Jahrb., xxxi, 1911, p. 424, fig. F. 

 Originally described as a Trypeta from Asmara, Erythraea, and very like the 



following species, of which it is obviously only a form and probably the typical one, 

 in which the middle indentations of the wings are not fused together to form a single 

 hyaline band across the whole wing. 



2. Tephrella nigricosta, Bezzi, Bull. Soc. Ent. Ital, xxxix (1907), 1908, p. 156. 

 Described from Erythraea, C4hinda and Keren, and not found subsequently. 



