124 



9. Abdomen with belly red .............. flammiventris, sp. n., 



Abdomen with a conspicuous red lateral [p. 129. 



stripe, often broken up into a row of 

 spots .............................. indica, Walk., p. 130. 



10. The 1st longitudinal vein ends distinctly 

 beyond fork of 4th vein but sometimes 

 only shortly so ..... , .............. 11. 



The 1st longitudinal vein ends exactly 

 opposite fork of 4th vein * .......... 14. 



1 (a). All the coxse and femora bright yellow, [p. 130. 



tibiae and tarsi black .............. Jlavofemorata, sp. n., 



(b). Fore femora distinctly yellow or yellow- 



ish, posterior femora black or very [p. 131. 



dark brown ...................... diversifies, sp. n., 



(c). All the femora black or blackish, or 



at most pale brown .............. 12. 



12. The 1st longitudinal vein ends at two- [p. 133. 



thirds of the length of the wing ...... longinervis, sp. n., 



The 1st longitudinal vein ends at or about 

 the middle of the wing .............. 13. 



13. Larger species (5-6 mm.); 1st longitudinal 



vein ends a little beyond fork of 4th [p. 131. 



vein ; wings and legs black .......... nigripennis, sp. n., 



Smaller species (4-5 mm.); 1st longitudinal 

 vein ends considerably beyond fork of 



4th vein ; wings pale blackish, legs pale [p. 132. 



dirty brown ....................... fratercula, sp. n., 



14. Shoulders black ...................... exacta, sp. n., p. 132. 



Shoulders reddish yellow .............. flavicollis, sp. n., 



15. Wings with a wide infuscated band across [p. 134. 



the middle ................ ........ fascipennis, sp. n., 



Wings without markings .............. 16. [p. 136. 



16. Thoracic dorsum mainly reddish yellow 



or brownish yellow ; with or without 



stripes (the stripes in latelineata occupy- 



ing nearly the entire dorsum) ........ 17. 



Intermediate species between groups 17 



and 24 with chestnut-brown thorax . . inconspicua, sp. n., 

 Thoracic dorsum mainly black or blackish [p. 142. 



brown ............................ 24 



17. Flagellum of antennae black, or at most, 



part of 1st joint yellow .............. 18. 



Flagellum with at least the two basal 

 joints wholly yellow ................ 23. 



18. Thorax unstriped ................... 19. 



Thorax with three distinct stripes ...... 21. 



19 (a). Scutellum with six long stift' hairs on 



posterior margin ................ se.rseosa,sp.n.,p.l37. 



(6). Scutellum with four similar long stiff quadrisetosa, sp. n., 



hairs ............................ [p. 137. 



(c). Scutellum with two similar long stiff 



hairs . . 20. 



* Within very close limits, a small individual variation must be allowed for. 



