Pipunculus. 21 



— Middle cross-vein about or beyoncl the middle of the 



discai cell 33. 



27. Eyes in male not touching; legs in female not quite 



yellow (see seminiaculatus) 28. 



— Eyes in male touching ; legs in female practically all 



yellow 32. 



28. Male liypopygium without impression; female hypo- 

 pygium witli the basal part small, the ovipositor 

 considerably longer; size 4,2—4,5 mm 17. rufipes. 



— Male hypopygium with impression; female hypo- 

 pygium with the ovipositor not longer than the basal 



part ; smaller species 29. 



29. Third antennal joint yellow, very long-rostrate . ... 19. xanthocerus. 



— Third antennal joint dark or not long-rostrate 30. 



30. Femora mainly black; male hypopygium very large 

 with a large impression; female hypojjygium yellow, 



flat, short and broad 18. haemorrhoidalis. 



— Femora mainly yellow ; male hypopygium with a small 

 impression; female hypopygium yellow, ellipsoidal 31. 



31. Femora with a distinct black ring at base 20. xanthopus. 



— Femora all yellow or practically all yellow 22. semimaculatus. 



32. Humeral knob yellow; male hypopygium not large; 



female hypopygium black 21. maculatus. 



— Humeral knob black; male hypopygium large; female 



hypopygium yellow 22. semimaculatus. 



33. Eyes in male touching for only a very short space; 

 thorax greyish or whitish pruinose, when seen from 



in front; abdominal hairs pale 23. littoralis. 



— Eyes in male touching for a longer space ; thorax not 



greyish or whitish; abdominal hairs dark 34. 



34. Abdomen in male with the hairs somewhat long, 

 hypopygium with a long, oblique, narrow furrow; 

 hind trochanters in both sexes armed with small 

 bristles below at base and anterior femora in female 

 with a couple of bristles below at base; tarsi yellow; 



claws and pulvilli in female larger than in male. ... 24. sylvaticus. 



— Abdomen in male with the hairs short, hypopygium 

 with a broad impression ; hind trochanters and anterior 

 femora unarmed; tarsi black, claws and pulvilli in 



female not larger than in male 25. nigritulus. 



As seen from the table the species fall into several rather well 

 distinguished groiips, five in all, already more or less used by Thom- 

 son, Becker and Verrall. First the species are divided into two larger 

 groups, one with a coloured stigma about as long as next costal 

 segment, the other without stigma and the third costal segment much 



