- 377 



in the latter case with a broad band along the cord; usually with one 

 or more spinous setae at origin of basitarsi (lacking in pluriguttata; 

 character not mentioned in hirsutipes). 7 



2. Size very large (length of Ç about,40 mm.; wing about 28 mm.) 

 abdominal tergites fulvous yellow, trilineate with dark brown. (Ca- 

 meroun). L. vasta Alex. 



Size smaller (length under 35 mm.; wing 25 mm. or less). 3 



3. Tibiae yellow with three conspicuous dark brown rings, one 

 basai, one medial and one terminal. (Cameroun). 



L. tibialis, sp. n. 



Tibiae with at most a single obscure yellow ring on the 

 groundcolor. 4 



4. Mesonotal praescutum with three broad, dark brown stripes, 

 the médian one somewhat bisected by a pale line; tibiae with a yellow 

 subbasal ring;ninthtergite of maie hypopygium black. (French Congo, 

 Nigeria). L. atricauda Alex. 



Mesonotal praescutum with a distinct dark brown or blackish 

 médian vitta, at least on anterior half; tibiae reddish brown to brown, 

 without a subbasal pale ring; ninth tergite of maie hypopygium brown 

 or brownish fulvous. 5 



5. General coloration reddish fulvous, the praescutal stripes 

 inconspicuous; head bluish plumbeous; wings with the basai sec- 

 tion of M-i nearly in alignment with M; cell znâ A narrow ; size 

 small (length, tf, about 22 mm.). (Tanganyika Territory). 



L. tanganicœ Alex. 



General coloration brownish yellow or brownish gray, the 

 praescutal stripes distinct, with a médian dark brown vitta; head light 

 brownish gray; wings with the basai deflection of M3 diverging 

 strongly from the line of M; cell znd A broad; size larger (length, d% 

 about 30 mm.). 6 



6. Mesonotal praescutum with three indistinct stripes that are 

 narrowly and indistinctly margined with darker, the médian stripe 

 bisected by a narrow dark brown vitta. (Cameroun, Congo, Uganda) 



L. af ricana af ricana Alex. 



