the Ti'pulid genus Styringomyia. 211 



5. A distinct dark patch towards the base of the wing over vein 



Cu 6. 



No such patch present 7. 



6. Ax sharply bent downwards near the tip . marshalli, sp. n. 

 Tip of Ax curved downwards .... lineaticeps, sp. n. 



7. Femora yellow with two black rings . . mahensis, Edw. 

 The dark rings of the femora so broad as almost to obliterate 



the yellow nigrofeinorata, sp. n. 



8. No darkening of the membrane round the R-M cross-vein, 



though many of the veins are dark . . impunctata, sp. n. 

 A distinct dark spot on the membrane round the R-M cross- 

 vein 9. 



9. The short vein R2 + 3 largely dark (compare also crassi- 



costa^) 10. 



R2 + 3 entirely pale ; the central dark spot does not extend into 

 cells Rj and R2 + 3 11. 



10. Joints of palpi pale at their bases . . . variegata, sp. n. 

 Palpi entirely blackish ; all markings much less sharply defined 



nigripalpis, sp. n. 



11. Tip of Ax angulated, with a stump arising from the angle, and 



a more or less distinct dark spot on the membrane round this 



stump 12. 



Tip of Ax without any stump (except sometimes in *Si. formo- 

 sana), and even when darkened the cloudiness does not 

 extend on to the membrane 16. 



12. Slight but obvious dark clouds surrounding the tips of all the 



veins ceylonica, Edw. 



No cloudiness on the membrane surrounding the tips of the 

 veins, even though the tips themselves may be somewhat 

 darkened 13. 



13. Second joint of antennae (normally) considerably darkened, 



often almost black 14. 



Second joint of antennae yellowish, or occasionally slightly 

 darkened 15. 



14. Male abdomen with a continuous median longitudinal dark 



stripe vittata, sp. n. 



Male abdomen without such stripe . . crassicosta, Speiser. 



15. Tenth stemite of male not trilobed . . sjostedti, sp. n. 

 Tenth stemite of male trilobed . . . annulipes, End. 



16. Tip of Ax distinctly darkened 17. 



Tip of Ax scarcely or not at all darkened . . . .20. 



17. Hardly a trace of darkening at the apex of the discal cell 



formosana, sp. n. 

 Veins at apex of discal cell obviously darkened . . .18. 



p2 



