20 Pipunculidae. 



14. Frons black above; last abdominal segment without 

 middle fiirrow; humeral knob dark and legs mainly 



dark 3. fuscipes ?. 



— Frons quite gi'ey; last abdominal segment with a 

 middle fm-row; hiimeral knob yellow and legs mainly 



yellow 5. coloratus $. 



15. Thoracic disc distinctly and relatively densely hairy 

 all over ; middle f emora with obvious ciliation behind ; 



tibiæ not quite yellow or mainly dark 16. 



— Thoracic disc nearly bare, with fine hairs only as 

 dorsocentral rows and behind humeri; middle f emora 

 with a more faint ciliation behind; tibiæ quite yellow 

 or nearly (in zermattensis no ciliation on femora and 



legs dark, but this species has an incomjolete stigma) 23. 



16. Males 17. 



— Females 20. 



17. Abdomen shining, without velvet bands 10. sjnnipes ,$. 



— Abdomen with velvet bands 18. 



18. Thorax shining; the velvet bands on abdomen narrow 9. varipes (J. 



— Thorax pruinose, more or less dull; the velvet bands 



on abdomen broader 19. 



19. Abdomen with the velvet bands of medium breadth 



and with distinct grey lateral spots; frons brown. . 11. Thomsoni ^. 



— Abdomen with the velvet bands very broad and 

 without or with indistinct brownish lateral spots; 



frons dark or blackish brown 12. ater cJ. 



20. Thorax rather shining; ovipositor strongly recurved; 



legs mainly yellow; humeral knob yellow 9. varipes $. 



— Thorax more or less pruinose; ovipositor straight or 

 slightly curved; legs darker; humeral knob dark 21. 



21. Thorax (generally) somewhat shining behind; ovi- 

 positor somewhat longer than the basal part 10. spinipes ?. 



— Thorax more dull; ovipositor of about the length of 



the basal part 22. 



22. Frons quite grey; ovipositor straight or nearly so. . 11. Thomsoni ?. 



— Frons black above; ovipositor somewhat recurved . 12. ater ?. 



23. Stigma incomplete, not reaching the tip of the media- 



stinal vein; legs nearly all black 13. zermattensis. 



— Stigma complete ; legs mainly yellow 24. 



24. Legs quite yellow and humeral knob yellow 14. Braueri. 



— Legs not quite yellow and humeral knob dark 25. 



25. Third antennal joint not rostrate; only hind femora 



shining behind 15. semifumosus. 



— Third antennal joint rostrate; all femora shining 



behind 16. pulchripes. 



26. Middle cross- vein much before the middle of the discai 



cell 27. 



