H. C. EFFLATOUN. 



11 (10) Species dark but not metallic; distinct 



eye-margins présent; oiiter top angles 



of cells R5 and M2 ahvays acute 5 Chilosia.* 



12 (9) Species with pale murkings on parts 



of thc licad, thorax, scutellum and 

 abdomen. 



13 (14) ITind feiiiora thickencd and sj)inosc ^ Svritta 



beneath (PI. JI, fig. 8) (MILESIN.-E). 



14 (13) Hind feniora not thickencd or spinose. 



15 (26) Abdomen not conspicuously constricted 



about the base. 



16 (17) Face and scutelhnn entirely ccneous or 



black (sometimcs aj^pcaring grey or 

 yellowish from superincumbent dust) ; 

 thorax providcd on the sides above the 

 notopleural dépression and before the 

 transverse suture with a rather 

 prominent tuberclc; cell M2 shortei- 

 than oeil R5 7 Melanostoma.* 



17 (16) Face and scutelhnn partly or wholly 



yellowish. 



18 (21) Thorax with bright yellow sido lines 



and the pleura with yellow markings ; 

 abdomen narrow, elongate and witli 

 parallel sides. 



19 (20) Abdomen narrowcr than the thorax, 



not flattened, usually longer than thc 

 wings; maie genitalia very large and 

 orbicular 8 Si'ii.i;RoriioiuA. 



20 (19) Abdomen as broad or a little broader 



than the thorax, flattened, shorter than 

 the wdngs; maie genitalia of moderate 

 size 9 Xantiioc.ramma. 



21 (18) Thorax without any bright yellow side 



lines and the pleuras not yellow spotted. 



•^So far not represcntcd in Egypt, 



