3. Males ... 4

– Females ... 11

4. Wing with anal lobe quite undeveloped, narrow at base and widening out to a broadly rounded tip; apical section of M₁₊₂ longer than basal section measured from r-m; R₄₊₅ and M₁₊₂ slightly divergent in apical half, then converging at apex; 1.9-2.25. Fig. 202... cuneatus(Becker)

– Wing of normal shape, with distinct anal lobe; apical section of M₁₊₂ vein longer than basal section measured as above; R₄₊₅ and M₁₊₂ either parallel or slightly converging in at least the greater part of apical half, though sometimes diverg­ing at apex ... 5

5. Scutellum with 4 bristles, 2 strong and 2 much weaker. Front and mid tibiae clear yellow; 1.75-2.5... 5

– Only 2 scutellar setae, strong; tibiae darkened, at least brownish ... 6

5. Distal thin part of hypandrium as long as or longer than proximal broad part. Fig. 204 ... intercedens Negrobov

– Distal thin part of hypandrium 1/3 shorter than proximal broad part. Fig. 207 ... pollinosus Verrall

6. Mid tibia without an anterior bristle at basal third; stylus long and slender; apical section of CuA₁ 2.5 times as long as m-cu; 1.6-2.8. Fig. 206 ... nigricauda Wood

– Mid tibia with an anterior bristle at basal third; apical section of CuA₁ either twice or three times as long as outer m-cu ... 7

7. Antennal stylus distinctly pubescent, strongly thickened and almost uniformly thick throughout; palpi short and broad; R₄₊₅ and M₁₊₂ practically parallel in apical half, curving rearwards in apical third; hind basitarsus about 0.75 times length of 2^nd segment; 2.0-2.5. Fig. 203 ... divisus Strobl

– Antennal stylus practically bare and more slender ... 8

8. Palpi short, hardly longer than postpedicel; stylus very slender and tapering to a fine tip; mid tibia entirely brownish; 1.75-2.0.Fig. 210... tarsalis Parent

– Palpi decidedly longer than postpedicel; stylus distinctly thicker and less tapering; mid tibia paler (more yellowish) posteriorly ... 9

9. R₄₊₅ and M₁₊₂ distinctly divergent at apex; stylus uniformly somewhat thickened throughout; about 2.0. Fig. 205... laetus Verrall

– R₄₊₅ and M₁₊₂ not divergent at apex; stylus rather more slender and somewhat tapering ... 10

10. R₄₊₅ and M₁₊₂ distinctly convergent at apex; mesonotum densely pollinose; clypeus mat; distal process of cercus 4 times longer than high at base (lateral view); 1.25. Fig. 208 ... pruinosus Parent

– R₄₊₅ and M₁₊₂ almost parallel; mesonotum weakly pollinose; face shining; distal process of cercus not more than 2.5 times longer than high; 1.5-1.9. Figs. 200(1-2) ... bellus Loew

11. Mid tibia without an anterior bristle at basal third; stylus long, slender and tapering ... 12

– Mid tibia with an anterior bristle at basal third ... 14

12. Legs entirely black, or partly metallic blackish green, at most knees and hind tibia sometimes rusty yellow; 2.75-3.0 ... cuneatus(Becker)

– All tibiae brownish yellow ... 13

13. Apical abdominal tergite with a small raised hump on hind margin; fore basitarsus decidedly more than half as long as tibia; apical section of CuA₁ more than 2.5 times as long as m-cu; 1.6-2.8 ... nigricauda Wood

– Apical abdominal tergite not as above; fore basitarsus hardly half as long as tibia; apical section of CuA₁ not more than twice as long as m-cu; about 2 ... tarsalis Parent

14. R₄₊₅ and M₁₊₂ divergent at apex; stylus almost uniformly somewhat thickened throughout; 2.0-2.25 ... laetus Verrall

– R₄₊₅ and M₁₊₂ not divergent at apex ... 15

15. Fore and mid tibiae yellow; apical section of M₁₊₂ hardly 1.5 times as long as basal section measured from r-m; 2.0-2.5 ... pollinosus Verrall

– Tibiae darkened, at least brownish; apical section of M₁₊₂ quite twice as long as basal section measured as above ... 16

16. Strong thoracic bristles pale yellow; R₄₊₅ and M₁₊₂ distinctly, even though only slightly, convergent in apical half; mid basitarsus often mainly yellow; 1.75-2.0 ... bellus Loew

– Strong thoracic bristles brownish black to black; R₄₊₅ and M₁₊₂ practically parallel in apical half; mid tarsus dark; 2.5-2.75 ... divisus Strobl