32 SYRPHID &. 
with a dullish less distinct transverse grey band, black-haired on 
the middle, the vertical portion bare (perhaps denuded?) ; the 
frons is depressed in the middle, the supra-antennal tubercle being 
therefore very prominent; face covered with dense grey tomentum, 
which conceals the ground-colour, and with a chimes median black 
stripe extending to the base of the antenne ; facial ‘tubercle rather 
prominent ; sides of the face clothed with long pale hairs ;_peri- 
stoma narrow, wholly black; postocular border with long hair ; 
eyes covered with dense hair, which above is darker serie short 
antenne black, almost reaching the epistoma; third joint very 
swollen, grey tomentose ; arista, yellowish. Thorax as in the pre- 
ceding species ; anes cen swollen, pale yellow and with pale hair. 
Squamule dirty whitish, iio white. Abdomen clothed on its 
whole length with siher long pale hair, chiefly on the sides ; it is 
all bluish blaek and shining, the second and third segments with a 
narrow basal whitish ark which is yellow by transparency, the 
band on the third being closer to the fore border; fourth segment 
with a slight trace of a ‘similar but darker band on the sides only ; 
fifth entirely black. Venter black, with greyish bands and long 
yellowish hairs. L o's black ; the four en ior tibize and-the eaees 
of the hind legs yellow ; first joint of hind tarsi very swollen, as 
long as the hee joints fe eon together. Wings as in the preceding 
species, but the stigma blackened at base, the hyaline portion 
before it being more ates t; third vein almost straight. 
Type 2, trom Mpumu, Uganda, 22; v.. 1910 -( Dr. CA. 
i Tg gins) ; a single specimen. 
24. Syrphus adligatus, MW vedemann (1824). 
Very distinct, owing to the broad yellow band on the third 
Shddiulnell segment cand the dullish thorax. 
This species seems to be variable in the size and number of the 
vellow abdominal bands, in the colour of legs and wings, and in the 
hair of the face varving from pale to black. I have > attempted to 
distinguish the following three forms:— 
(a) adligatus (typical). 
The band on second segment is narrow, that on third broad, and 
that on fourth more or less broad ; the legs pale ; the wings greyish 
hyaline. This agrees with the form ticured by Mr. Anistensin 1909 
(‘frans. Zool. Soc. xix. pl. in. fig. 3), except that the end of the 
abdomen is not yellow and the legs are not so black. 
Two males and a female from “Durban (F. Muir); a male from 
Marsabit, British East Africa (ft. J. Stordy); a female trom 
Mt. Kenia, W. side, Meru-Nyeri Rd., 6,500 ft., 20.11. 1911 OS. A 
Neave). Dr. Speiser has re corded the species from Kilimandjaro. 
(b) tricolor, Walker (1852). 
Distinguished by the wings being infuseated basally and by the 
vellow abdominal bands being much broader, chiefly those on the 
second and fourth segments. 
