Mr. J. U, MuUocli un Ejott'c MiHCiirithe. 075 



cliaracters : — K_ves in both sexes widely separated ; thorax 

 usually with one pair of strong prcsutural dorso-central 

 bristles, if with two pairs tlieie are but three jjairs of post- 

 sutnrals, tlie lower stigniatal bristle is directed downward, 

 and there is but one antero-dorsal biistle on middle of hind 

 tibia ; sentelluin with at most four strong marginal bristles, 

 the smaller preapical bristles absent ; sixth wing-vein short; 

 seutelhnn without any soft ventral hairs ; lower calyptra 

 larger than upper, sometimes inconspicuously so. 



Key to Genera in Africa. 



1. TlioiMx witli two pairs of strong postsiitiiral 



dorso-ceiitral bristles ; lower calyptra 



but little larger than upper 'J. 



Thorax with three pairs of postsutural 

 dorso-central bristles; lower calyptra 

 usually much larg-er than upper 4. 



2. Costal vein ending at or slightly beyond 



apex of third vein ; mid-tibia with a 



long bristle at base Tenuicoda, Stein. 



Costal vein continued to apex of fourth 

 vein 3. 



3. Scutellum with four strong bristles ; fore 



tibife of males feathered Anaphalantus, Loew. 



Scutellum with but two strong bristles; 



fore tibiae of males not feathered Microcalyptra, Stein, 



4. Scutellum with but two strong bristles; 



fore tibia3 unarmed at middle 5. 



Scutellum with four strong bristles 6. 



5. Hind tibia with one long and one short 



anteio-vential brit;tle ; thorax with one 



pair ot pre.'^utural dorso-central bristles. . Orchi.su, liiiiHlaiii. 

 Hind tibia with at most one short antero- 

 dorsal bristle; thorax with two pairs of 

 presutural dorso-central bristles Spanocficeld, Stein. 



6. Costid vein ending at apex of third vein . . Brcvicosta, Malloch. 

 Costal vein continued to apex of fourth 



vein 7. 



7. Anterior thoracic dorso-centrals very short, 



but little longer than tlie adjacent setu- 

 lose hairs ; fure femur with one or two 

 bristles near apex on postero-ventral 



surface Atheriyona , luuidani. 



Anterior thoracic bristles long and strong, 

 well differentiated from any minute 

 setula3 that may be present ; fore femur 

 with a complete series of bristles on 

 postero-ventral surface 8. 



8. Hind tibia with one or two strong bristles 



on postero-dor.sal surface near middle . . 9. 

 Ilind tibia without brisllfS on posteru- 

 dorsal surface near middle 10. 



9. Hind tibia v^iih two bristles on postero- 



