50 SYRPHID &. 
portion shorter and broader; legs with the four front femora 
entirely yellow and the hind ones w vith the basal half yellow; wings 
narrower and longer, without the apical infuscation, and with 
more slender veins. 
Another male from Zungeru, N. Nigeria, xi. 1910 (Dr, J. W. S. 
Macfie), is very similar, but has the wings infuscated with a 
vellowish-brown tinge. c 
44. Baccha ? brevis, Avrsch (1887). 
Near clar/pennis, having hyaline wings and a short abdominal 
stalk constricted in the middle, but apparently distinct, on account 
of its darker antenne and legs. 
I refer with doubt to this species a female specimen from 
Chirinda Forest, Melsetter District, 8. Rhodesia, x. 1905 (G. A. K. 
Marshall), which is 8 min. long and has iE aise oe antenne, 
with the third joint blackened above, and almost blaek legs, with 
only the knees and the basal joints of the tarsi yellow. Th other 
respects it answers to the description of claripennis ; the true 
brevis seems to be smaller, only 6 mm. in length, and was found 
at Loanda, Angola. The pterostigma is pale yellowish, not brown 
at the base. 
Genus 9. RHINGIA, Scopoli (1763). 
For a long time the only known Ethiopian species of this genus 
was that described by Loew in 1857; Austen added a second species 
in 1893, and I myself a third in 1908; more recently four other 
species have been deseribed by Dr. Speiser and by myself. It seems 
that the Ethiopian fauna is very rich in species of this genus, 
chiefly of the characteristic group of metallic-blue forms. Those 
in the collection can be distinguished as follows + — 
1 (2) Thorax and seutellum entirely yellow ; 
frons of the female wholly ae > snout 
wholly yellow, without black band; abdo- 
men yellow, with very narrow black hind 
borders to the SEOUNENUSS co eens cee es lutea, sp. n. 
2 (1) Thorax either entirely metallic bine, or 
entirely black, or with only the sides ‘and 
pleuree ' ye soe, 
8 (6) Abdomen yellow with black or blue bands. 
4 (5) Sides of thorax and pleurze metallic seneous, 
with only some small yellowish markings, 
seutellum dark metallic; abdominal bende 
black, that on the second segment not 
dilated towards the sides.......... eee. semicerulea, Aust. 
5 (4) Sides of thorax and pleure yellow; scu- 
tellum yellow; abdominal bards blue, 
that on the second segment greatly dilated 
on the sides, ceeupying the whole of the 
laterals bordensinwm cies, «chs ES ORAL pellucens, sp.u, Vo 
