121 s 



eves bare, of a shining dark brown colour, with facets almost equal 

 in size ; antennae very short, black, the tirst 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 distinct ; proboscis yellow, 

 thick and prominent, with broad labella. Thorax and scutellum 

 shining greenish aeneous, finely punctate, clothed with rather long, 

 erect, dark grey hair ; on the hind part of the dorsum, before the 

 scutellum, there are the characteristic spots margined with purple 

 and blue ; pleura? partly dark yellowish, with longer hairs. 

 Scutellum deeply emarginate behind, almost bidentate. Squamulae 

 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 brevi- 

 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 ; coxa? black ; femora yellow, more or less 

 darkened towards the base above ; tibia? 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 ; onlv the 

 lower corner of the subapical cell bears an appendix. 



$ . Length of the body 8 mm. Of larger size than the c? ; 

 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 ; tibiaa 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. 



GROUP III. (obssus, Ilerve-Bazin). 



This group consists of the typical species devius and mutalilis ; 

 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 antenna 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. Micro don obesus, Herve-Bazin (1913). 



A small, hairy species, not unlike the European devius, but 

 smaller and with stronger and longer spines on the scutellum. 

 Body very finely punctate. Frons rather short ; ocelli not far 



