2. — Abdomen with the base, fourth segment and hypopygium bright 



orange. (Ashanti). L. grahami (Alex.) 



Abdomen with only the génital segments orange-yellow. 3 



3. — Metapleura obscure yellow: costal and subcostal cells more or less 



yellowish ; abdominal segments uniformly black. (Belgian Congo- 

 British East Africa). L. congoensis (Alex.) 



Metapleura black , costal and subcostal cells dark brown , basai 

 half of abdominal segments shiny blue-black, the caudal half 

 velvety-black. (Uganda). L. imitatrix, sp. n. 



4. — Pleura with no distinct dark markings. (Southern Nigeria). 



L. humfreyi (Alex.) 

 Pleura and mesosternum transversely banded with black. 5 



5. — Abdominal tergites three to six with the caudal half of each 



orange-yellow; femora black, with a broad, diffuse, pale subter- 

 minal ring. (Belgian Congo). L. schoutedeni, sp. n. 



Abdominal segments not marked as above; femora without a 

 pale subterminal ring. 6 



6. — Scutellum black, except at base , basai half of postnotum golden- 



yellow, apical half black; médian praescutal stripe broad; coxas 

 reddish yellow; femora black; wings with. broad brown seams 

 along the cord ; basai abdominal segments largely reddish. (Bri- 

 tish East Africa). L. edwardsi Alex. 



Scutellum yellow; postnotum black; mesonotal praescutal stripe 

 narrow; middle and hind coxas black; femora dull yellow, the tips 

 broadly brownish black; wings with the markings very narrow and 

 indistinct; basai abdominal segments largely black. (Southern 

 Nigeria) L. compta Alex. 



GENUS ERIOPTERA MEIGEN. 



ERIOPTERA (ERIOPTERA) BEQUAERTI, sp. n. 



Belongs to the péringueyi group; head shiny black; mesonotal 

 praescutum yellow with a T-shaped black mark, the usual stripes not 

 attaining the suture; scutellum and postnotum black; wings yellow 

 with three broad, pale brown crossbands, the tip yellow; hypopy- 

 gium yellow, the inner pleural appendage provided with a long, ter- 

 minal beak that is set with microscopic setae. 



Maie. - Length 5. 8 mm.; wing 5.6 mm. 



Rostrum light brown; palpi with the basai segments yellow, the 

 terminal segments dark brown. Antennaî brown, the scapal segments 



