68 Orthorrhapha brachycera. 



— Front tarsi black, with only basal joint, except the 



apex, yellow, front coxæ quite yellow 25. trivialis. 



20. Front coxæ somewhat black-haired 21. 



— Front coxæ white-haired ; hind tibiæ quite yellow. . "^S, arbustorum. 



21. Hind tibiæ blackish at the apex 26. festivus. 



— Hind tibiæ quite yellow 27. ciliefemoratus. 



22. Middle tibiæ with more than one bristle beneath. . \7. discifer. 



— Middle tibiæ with only one bristle beneath 23. 



23. Hind femora with more than one preapical bristle 22. popularis. 



— Hind femora with only one preapical bristle {urhanus 

 may sometimes have two, but is known by its al- 

 most quite black hind tibiæ) 24. 



24. Discai vein bent rectangularly 25. 



— Discai vein bent obtusely 26. 



25. Hind metatarsi only black at tip, with two bristles 



above 29. nitidus. 



— Hind metatarsi quite blackish, with only one bristle 



above 30. griseipennis. 



26. Hind tibiæ nearly quite black 23. urhanus. 



— Hind tibiæ yellow, or only black a tip 27. 



27. Epistoma distinctly pubescent 28. 



— Epistoma not pubescent 29. 



28. Hind femora with an obvious black spot above at 



the apex, hind tibiæ distinctly black at the apex . . 33. nuhilus. 



— Hind femora with a less distinct, blackish or brownish 

 spot above at the apex, hind tibiæ slightly darkened 



at the apex 34. latilimhatus. 



29. Hind metatarsi with only one bristle above 40. agilis. 



— Hind metatarsi with more than one bristle above .... 30. 



30. Hind coxæ mainly yellow 31. 



— Hind coxæ grey 33. 



31. Middle coxæ mainly grey; third antennal joint some- 

 what long, sharply pointed 32. 



— Middle coxæ yellow, only with a grey stripe on 

 the outside; third antennal joint shorter, not sharply 



pointed 35. linearis. 



32. Antennæ black, only yellow beneath the basal joint 'i\. acuticornis. 



— Antennæ yellow, black above and at tip 32. longicornis. 



33. Antennæ black, only yellow beneath the basal joint, 



or beneath basal and second joint 34. 



— Antennæ more yellow; third joint partly yellow (in 

 sahinus only a shght spot below at base), or when 



third joint black, the first joint is quite yellow 37. 



34. Basal joint of middle tarsi black 38. lineatocornis. 



— Basal joint of middle tarsi with the basal part pale . . . 35. 



35. Hind tibiæ distinctly black at the apex 36. 



— Hind tibiæ not or slightly darkened at the apex . . 'iX. pennatus. 



36. Epistoma somewhat narrow, greyish yellow; antennæ 



as long as the head, third joint as long as broad 35. notabilis. 



