49 SYRPHID&. 
Head shining black, the occiput also very little dusted ; occipital 
fringe of rigid white hairs well developed; frons very short and 
with dark hairs, the whitish transverse middle band ‘ill-defined ; 
antennal tubercle not very prominent, the ocellar tubercle not at all 
prominent; face shining black, with pale grey dust and with sparse 
pale hair on the sides, the central tubercle small but sharp and 
prominent; peristoma linear; antennz very short, wholly orange- 
coloured, with short, bluntly ovate third joint and bare yellow 
arista; eyes with two bands, one on the middle, the other on the 
superior fourth. Thorax black zneous, metallic, shining, clothed 
with thin and depressed whitish hairs; pleure with erect short 
haus ; humeral calli very small and indistinct, reddish. Scutellum 
like the thorax pale-haired ; squamule and halteres yellowish. 
Abdomen proportionally short; first and second segments entirely 
black, shining, with long ences white hairs on the sides ; second 
segment as long as the third, not evlindrical, a little constricted 
towards the matdaies alone forming the stalk ; the third, fourth, and 
tifth segments, forming the spatulate and rather broad portion of 
the abdomen, are reddish with a median longitudinal black stripe, 
and the third and fourth besides with an oblique black streak on 
each side proceeding from the posterior corners and passing the 
middle of the segment. After the fifth segment there is only the 
ovipositor, which is longer than this segment, rectangular in shape, 
less attenuated at end “and. black w ith the base red; it consists of 
two broad flattened scales, a superior and an inferion one, the first 
ending in three, the second in two points. Venter of a reddish 
colour. Legs short and stout, entirely pale yellow, with a sharply 
defined and ‘broad black preapical ring on the hind monet Wines 
not widened, hyaline, vitreous, the subcostal cell only pale > pelle: 
at end; apical brown spot not large, triangular, extending from 
the ent of the second to the third vein, and. along this vein from 
the subapical eross-vein to the tip; third vein faintly sinuous ; 
anal cell of usual shape; alula and axillary lobe well developed. 
Type Q,a single specimen from Salisbury, 8. Rhodesia (G. . 
K. Marshall). 
36. Baccha picta, Wiedemann (1830). 
A handsome species, easily distinguished on account of its 
yellow, black- striped thorax and very broad and blackish-brown- 
tinged wings, which bear an abbreviated middle yellow stripe and 
a broad complete preapical hyaline band. 
Loew has already recorded the variability of this species as 
regards the colouring of the spatulate portion of the abdomen, 
which varies from entirely black to reddish yellow with three black 
stripes. The black stripes of the thorax vary also from two to five ; 
sometimes they are even dilated and fused together, the thorax 
being therefore wholly black in front of the suture. 
The previously undescribed male is like the female, but has the 
thorax wholly black on the back, except a reddish-yellow lateral 
