124 SYRPHILD-E. 
eves bare, of a shining dark brown colour, with facets almost equal 
in size; antenne very short, black, the first joint clothed with 
black hair, as long as the third, which is oval; second joint about 
half the length of the third; arista short, as long as the third 
joint and situate near its base, black, not thickened ; face narrow, 
somewhat constricted below, gently convex, clothed with white 
hairs, its ground-colour, however, being distinet ; proboscis yellow, 
thick and prominent, with broad labella. ‘Thorax and scutellum 
shining greenish zneous, finely punctate, clothed with rather long, 
erect, dark grey hair; on the hind part of the dorsum, before the 
seutellum, there are the characteristic spots margined with purple 
and blue; pleure partly dark yellowish, with longer hairs. 
Seutellum deeply emarginate behind, almost bidentate. Squamule 
rather large, white; halteres whitish. Abdomen much broader 
than the thorax, short and rounded, clothed with short hair; it is 
almost entirely yellow, only the sides and the fourth segment 
being more or less darkened; second, third, and fourth segments 
with the transverse bands of grey pubescence like those of brev- 
cornis; the last segment is only twice as long as the third, and 
the divisions between segments are distinct. Genitalia dark 
yellow, pilosity white. Belly entirely yellow. Legs with rather 
long, pale pubescence; cox black; femora yellow, more or less 
darkened towards the base above; tibie whitish, with an ill-defined 
dark ring beyond the middle; tarsi short and broad, yellowish, the 
first joint of the hind tarsi not swollen. Wings greyish hyaline, 
with strong black veins, but without any infuscation ; only the 
lower corner of the subapical cell bears an appendix. 
Q. Length of the body 8 mm. Of larger size than the ¢ ; 
thorax and head blacker; frons and face broader, but the latter 
narrowed below; abdomen entirely blue-black, only the second 
segment being a little yellowish towards the sides; tibiz broadly 
black at the end; wings greyish hyaline as in the male. 
Two male specimens and a female from Durban, Natal, 1902 
(F. Muir); Walker's type was also obtained at Durban. 
\ 
Grove IIT. (obesus, Hervé- Bazin). 
This group consists of the typical species devvus and mutabilis ; 
the thorax and legs are clothed with rather long hair; the frons is 
narrow in the male; the face is broad, and not constricted below ; 
the antennz are long, the first joint being thin and longer than 
the third, which is elongate. 
The only addition to the group is the following species, which is 
allied to the two already mentioned. 
132. Microdon obesus, Hervé- Bazin (1913). 
A small, hairy species, not unlike the European devivs, but 
smaller and with stronger and longer spines on the seutellum. 
Body very finely punctate. Frons rather short; ocelli not far 
