122 SYBPHIDJE. 



halteres yellow. Abdomen black, punctate, with short, spars; 1 , 

 silvery pubescence ; first segment entirely black, as broad as the 

 scutellum ; second greatly constricted in the middle, black, with a 

 yellowish pellucid streak on each side, leaving in the centre a thin 

 black median line, which is dilated into a triangle behind, the yellow 

 streaks being therefore abbreviated forwards and reaching the hind 

 border on the sides; third segment black, reddish towards the 

 hind border, where there is a transverse band of silvery pubescence ; 

 fourth entirely dark reddish, longer than the third, with a broad 

 black spot on each side at the base ; genitalia red, concealed ; belly 

 red. Legs short and thin ; coxae and femora black, the two 

 anterior pairs partly reddish, the hind pair with yellow knees ; 



Fig. 20. -Microdon illucens, sp. n., rf . 

 Abdomen, X 9. 



four anterior tibiae reddish, with white pubescence ; hind tibiae 

 white on the basal, black on the apical half ; all the tarsi reddish 

 yellow, with a small black spot on the underside of each joint ; 

 claws with black tips ; hind tarsi not dilated. Wings hyaline, 

 rather narrow, without stigma and with normal black veins ; the 

 two apical cross-veins and the well-developed stump are all parallel ; 

 lower corner of the subapical cell with short appendix, that of the 

 discal cell with none. 



Type d, a single specimen from Cape Ceira, Mozambique, 

 Portuguese East Africa, 3. vi. 1904 (F. Muir). 



GROUP II. (brevicornis, Loew*). 



This group is composed of short rounded species, with short 

 antennae and emarginate scutellum ; they are not very different 

 from the typical species and have the thorax and scutellum similarly 



