64 Orthorrhapha brachycera. 



— Posterior femora not pale-haired below; front tarsi 

 black 8. 



8. Middle tibiæ with a snow-white ring, metatarsi snow- 

 white, with a bristle above; hind femora with a 



long, black fringe below 6. Stenhammari. 



— Middle tibiæ black, metatarsi without bristle above; 



hind femora not fringed 9. picipes. 



9. Last joint of middle tarsi dilated b. planitarsis. 



— Last joint of middle tarsi normal 10. 



10. Middle femora with two preapical bristles 7. campestris. 



— Middle femora with only one preapical bristle 11. 



11. Epistoma brown; hind femora with a long, black, 



fringe below 8. lepidus. 



— Epistoma white ; hind femora without fringe; anterior 



tibiæ with a dark ring 10. varitihia. 



12. Antennæ quite black; hind metatarsi with more 



than one bristle above 13. 



— Antennæ yehow beneath the basal joint; hind tibiæ 

 dilated in the middle; hind metatarsi with only one 



bristle above 15. clavipes. 



1 3. Hind tarsi with the three last joints feathery 11. remipes. 



— Hind tarsi simple 14. 



14. Hind tibiæ with rather long bristles on the dorsal 



side, and also ventrally 12. tanythrix. 



— Hind tibiæ with shorter bristles, and only small 

 bristles ventrally 15. 



15. Epistoma brown; legs chiefly black 13. atripes. 



— Epistoma white; tibiæ yellowish 14. vitripennis. 



16. Lower postocular bristles pale 17. 



— Lower postocular bristles black 42. 



17. Front or middle tarsi adorned, i. e. one or more 



joints dilated, plumed or silvery 18. 



— Tarsi not adorned 25. 



18. Last joint of front tarsi dilated; middle tarsi normal. . . 19. 



— Last joint of front tarsi normal; middle tarsi partly 

 dilated, plumed or silvery 21. 



19. Hind femora with more than one preapical bristle; 

 squamulæ yellow fringed 16. claviger. 



— Hind femora with only one preapical bristle; squa- 

 mulæ black fringed 20. 



20. Discai vein slightly bent; front tarsi with the third 



and fourth joints of about equal length 17. discifer. 



— Discai vein almost rectangularly bent; front tarsi 



with the fourth joint about half as long as the third 18. confusus. 



21. Basal joint of middle tarsi feathered, others normal 22. 



— Basal joint of middle tarsi simple 23. 



22. Middle tibiæ not much longer than the tarsi, with 

 a brown line above; hind tibiæ at tip and hind 



tarsi black 19. plumipes. 



