48 SYRPHID”®. 
Head black; occiput with dark grey dusting, whitish on the 
sides below, and with the usual fringe of yellowish, rigid hairs; 
vertical triangle black, short and very narrow, black-haired ; frontal 
triangle «wneous, with some dark hairs above and on the sides; 
frontal tubercle rounded, prominent, violet-coloured, shining purple 
on the sides, with a semicircular depression above ; face shining 
wneous above and towards the middle, grey-dusted on the sides, 
yellowish below, the sides of the buccal cavity and the peristoma 
yellow, this last black behind; antennie dark luteous, the third joint 
short-oval ; eyes with the middle brown band only, touching along 
a line which isa little longer than the vertical triangle. ‘Thorax 
eneous, Without yellow markings, punctate, not very shining, clothed 
with depressed golden hairs; pleuree more shining, with longer 
golden hairs on the mesopleuree; scutellum wholly zneous, punctate, 
with very short and sparse hairs. Squamule yellowish, with a short 
fringe; halteres yellowish. Abdomen long and slender, almost 
linear: the hairs on the sides of the stalk are erect and yellowish, 
of medium length, the others are short and darker ; first segment 
wneous in the middle, yellowish on the sides; second entirely 
shining black, cylindrical, as long as the third; third and fourth 
at the base each with two ill-defined yellowish spots, which are 
bifid behind; fifth entirely black; genitalia shining zeneous, pale- 
haired: venter black, in the middle of the third and fourth seg- 
ments there is a yellow spot, which is bifid behind. The four front 
legs and the front cox are yellow, the tarsi alone being darkened 
at the tip; hind femora yellow. with a broad preapical black ring ; 
hind tibie blackish, with broad yellow base; hind tarsi blackish, 
the first joint yellowish. Wings of normal size, evenly infuscated 
with a yellowish-brown tinge, which is a little paler on the hind 
border near the base; fore border blackish in the costal, mar- 
ginal, and end of submarginal cells to the end of the third vein; 
subeostal cell and stigma black ; third vein rather sinuous ; seventh 
vein bent up at the end, and therefore the shape of the anal cell 
is like that in the broad-winged species, but not so accentuated. 
The peculiar fleck at the end of the second basal cell is more 
conspicuous than usual in the clear-winged species ; from this fleck 
issues, as in the other species, a vein-like fold which divides the 
upper cross-vein between the second basal and the diseal cells. 
Type d, a single specimen from Obuasi, Ashanti, 8. xi. 1907 
(Dr. W. M. Graham). 
42. Baccha sapphirina, Wiedemann (1880). 
A black species, easily distinguished by the bright orange 
antenne, by the shining bluish transverse abdominal bands, and by 
the pure hyaline wings, which bear a black stigma and a black 
apical spot. 
B. flavicornis, Loew (1863), and B. punetum, Bigot (1883), 
ave certainly identical with the present species ; in 1908 T used 
the former name in recording the species from Erythreea. But, 
