81 



and decolor, the first of which must be retained, in opposition to 

 Kertesz's Catalogue, which has the second. Karsch describes only 

 the male ; the third antennal joint is elongate, rectangular, longer 

 than the first two joints taken together, black, narrowly reddish 

 below ; arista dark brown, bare, longer than the antenna. The 

 female is very like the male, but has the middle black facial stripe 

 less broad; above the antennal tubercle there is a shining black 

 broad area ; frons black, but in the middle with a grey transverse 

 band ; hairs on the frons rather short and regular, mostly black. 

 Abdomen as in the male, with very broad yellow bands ; fourth 

 segment black or only with a narrow yellow stripe on fore border. 



A male and three females from West Africa, Obuasi, Ashanti, 

 iv.-viii. 1907, " caught hovering over wells in stream, or on com- 

 posite flowers" (Dr. IV. j\L Graham). 



81. Lathyrophthalmus quinquelineatus, Falricius (1781). 



Easily distinguishable from any other species here recorded 

 owing to the presence of three black facial stripes, and to the face 

 being rounded and not produced. The eyes of the female are 

 almost bare, with only a few hairs above. 



Of this common and widely spread species there are numerous 

 specimens of both sexes from Nyasaland, Fort Johnston, 2,000 ft., 

 vi. 1910, dry season (A. H. Barclay], and same locality, i. 1910 

 (H. N. Tate) ; from Zomba, iv. 1910 (Dr. H. S. Stannns) ; from 

 Durban (Mitchell Park), Natal, 23. i. 1903 (F. Muir) from 

 Marsabit, British East Africa, 24. ix. 1911 (R. J. Stordy), and 

 same locality (Dr. G. Pitgh). 



82. Lathyrophthalmus tabanoides, JaennicJce (1867). 



Perhaps only a variety of the preceding, from which it differs 

 owing to paler coloration and broader and more conspicuous white 

 bands on the abdomen. 



Becker considers it to be a good species, while Yerrall has it as a 

 synonym of the preceding, with a query. The male is unknown. 



There are in the present collection some females from British 

 East Africa, Languaira, 11. ix. 1911 (R. J. Stordy), and one from 

 N. Guaso-Njero, 7. ix. 1911 (same collector); also a female from 

 Massowah, xii. 1886 to ii. 1887 (D. W. Barker). This last is the 

 locality where the species was first discovered by Ruppell. 



83. Lathyrophthalmus trizonatus, Bigot (1858). 



Among the members of the group characterised by a yellowish 

 facial tubercle, double pterostigma, and a band of brown hair 

 across the middle of the scutellum, the present species is dis- 

 tinguished by having yellow tarsi and broad black abdominal bands, 

 the second segment with the hind border only black. 



