26 SYRPHID®. 
(/) usambarensis, Bezzi (1908). 
Like the preceding form, but the first yellow band strongly 
constricted or interrupted. 
A single female specimen (same locality and collector as the 
preceding), 25. vii. 1907. 
(c) gemmata, var. n. 
Like the two preceding forms, but differing in the broader black 
bands of the abdomen, black-haired scutellum, and very large 
shining black spot, with bluish reflexions, on the supra-antennal 
tubercle. Length of body 11 to 14 mm., of wing 10 to 13 mm. 
Type 3 and another specimen from Obuasi, Ashanti, 6-7. vii. 1907 
(Dr. W. M. Graham). Type 9 and two other specimens, same 
locality and collector, 5-28. vii. 1907 and 13. vin. 1907. 
(d) punctifrons, dasten (1909). 
Characterised by its darker coloration, narrow yellow markings 
on the abdomen, the black bands being very broad, interrupted 
first yellow band, black lateral borders of abdomen, blackish scu- 
tellum, and infuscated wings. Length of body 14 to 15 mm., of 
wing 12 to 13 mm. This is possibly a good species; Mr. Austen 
knew only the male. The female has the black supra-antennal 
spot less distinet or wanting, the frons wholly black-haired and 
covered with dense yellowish dust with distinct metallic reflexions, 
and shining black towards vertex. 
One female from British E. Africa, in the Kenia Forest, 10.11. 1911 
(T. J. Anderson) ; another female from Marsabit, Brit. E. Africa, 
20. ix. 1911 (R. J. Stordy) ; a third female from Durban (F. Muir). 
(e) albifacies, var. n. 
Near typica, but differing in the glittering white tomentum and 
the white hairs on the sides of the face. Length of body 14 mm., 
of wing 1] mm. 
Type & from Uganda, Mpumu, Chagwe, iv. 1910 (Majors A. E. 
Hamerton, D.S.O., R.A.M.C., and H. R. Bateman, R.A.M.C.) ; 
a single specimen. 
(f) africana, Bezzi (1908). 
Very distinct on account of its flattened, wholly yellow frons, 
which besides is entirely clothed with pale hairs in the male, and 
at least on the apical half in the female; first yellow band divided 
in the male and entire in the female. Length of body 12 to13mm., 
of wing 10 to 11 mm. 
A male specimen from Durban (#. Muir) and a female from 
British East Africa, 13 miles north of M’bagori’s Village, towards 
Meru, 13. ii. 1911 (7. J. Anderson). 
This form is probably a good species, chiefly on account of the 
shape of the frons, which connects it with the rostvata-group. 
