S+4 SYRPHID ¥. 
and decolor, the first of which must be retained, in opposition to 
Kertész’s Catalogue, which has the second. Karsch describes only 
the male; the fhird 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 vellow stripe on fore border. 
A male and three females from West Afri ica, Obuasi, Ashanti, 
iv.-vill. 1907, * caught hovering over wells in stream, or on com- 
posite flowers” (Dr. WW. MW. Graham). 
. Lathyrophthalmus qninquelineatus, Pubricius (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 trom Nyasaland, Fort Johnston, 2,000 ft., 
vi. 1910, dry season (4. Af. Barclay), and same locality, 1.1910 
CH. N. Tate); from, Zomba, iv. 1910 (Dr. H. S. Stannus); from 
Durban (Mitchell Park), Natal, 23.1.1908 (2 Mut); from 
Marsabit, British East Africa, 24.ix. 1911 (2t. J. Stordy), and 
same locality (Dr. G. Pugh). 
82. Lathyrophthalmus tabanoides, Jaennichke (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 Verrall 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 
Kast Africa, Languaira, 11.ix. L911 (2. J. Stordy), and one from 
N. Guaso- Njero, 7 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 Riippell. 
83. Lathyrophthalmus trizonatus, Bigot (1858). 
Among the members of the group characterised by a yellowish 
facial tubercle, double pterostigma, and a band ot brown hair 
across the middle of the seutellum, the present species is dis- 
tinguished by having yellow tarsi and broad black abdominal bands, 
the second segment ‘with the hind border only black, 
