312 Mr. J. E. Collin's Contrihution towards knowledge of 



11. (16) Pie-a]ar bristle present even if short. Only 1-2 rows of 



upcurved bristles along oral margin of jowls. 



12. (15) Weakly bristled species. Head bristles short; very few 



bristles along oral margins. Ungues and pulvilli com- 

 paratively short. Hind tibiae with only 2-3 short 

 bristly hairs behind. 



13. (14) Arista practically bare. Abdominal stripe wider. Pro- 



sternal plate (between front coxae) bare or with a pair 

 of short hairs only 6. brevifrons Stein, 



14. (13) Arista pubescent. Abdominal stripe very narrow. Pro- 



sternal plate with a pair of strong bristles. 



7. buccaia Fin. 



15. (12) Strongly bristled species. Prosternal plate bare. Ungues 



and pulvilli long. Hind tibiae with a ciliation of 8-10 

 bristly haus behind 8. sponsa Meig. 



16. (11) Pre-alar bristle absent. Small, light dove-grey species 



with many rows of upcurved bristles on jowls. 



9. dorsalis Stein. 



Females. 



1. (10) Middle tibiae with a bristle beneath, or {vnilineata) more 



antero ventral. 



2. (3) Fions wider; at narrowest part more than I the width of 



head. Bristle beneath middle tibiae small and placed 

 more antero ventrally 1. unilineata Zett. 



3. (2) Frons narrower; at narrowest part much less than I the 



width of head. Bristle beneath middle tibia distinctly 

 ventral. 



4. (7) Front tibiae with two bristles behind. 



5. (6) Scutellum more densely hairy. Two distinct pre-apical 



bristles to front tibia. Postical cross-vein longer. 



2. obtusa Zett. 



6. (5) Scutellum less hairy at sides and bare about middle. Only 



one distinct pre-apical bristle to front tibia. Postical 

 cross-vein shorter 3. dissimilis Villen. 



7. (4) Front tibiae with only one bristle behind. 



8. (9) Pre-alar bristle strong though only about half the length 



of supra-alar. Postical cross-vein obhque. The middle 

 four bristles on hind-margin of last visible abdominal 

 segment much further from the margin than the others, 



4. personata n.n. 



9. (8) Pre-alar bristle very short and fine. Postical cross-vein 



more upright. Bristles on hind-margin of last abdominal 

 segment all equally near margin. . 5. unistriata Zett. 



