172 [August, 



23 (80) Lower postociilar cilia pale. 



24 (-41) Front or iiiiiklle tarsi adorned, L e., one or more joints plumed, dilated, 



or silvery. 



25 (30) Last joint of front tarsi dilated ; middle tarsi normal. 



26 (27) Hind femora with more than one preapical bristle ; squamiv; pale fringed... 



12. chiviger Stann. 



27 (2fi) Hind femora with only one preapical bristle ; squamae black fringed. 



28 (29) Discal vein scarcely bent ; basal joint of front tarsi as long as next two 



together 13. disci fer Stann. 



29 (28) Uiscal vein almost (or quite) rectangularly bent ; basal joint of front tarsi 



longer than next three together 14. com/msms Zett. 



30 (25) Last joint of front tarsi normal ; middle tarsi partly dilate I, or plumed, 



or silvery. 



31 (34) Basal joint of middle tarsi featiiered, others normal. 



32 (33) Hind tibiae at tip, and all hind tarsi, black 15. plumipes Scop. 



33 (32) Hind tibiae entirely, and base of hind tai'si, pale...!''. Wahlhergi, Zett. 



34 (31) Basal joint of middle tarsi simple. 



35 (36) Second joint of middle tarsi plumed (also third), while last two joints 



silvery 17. pennatus Meig. 



36 (35) Second joint of middle tarsi normal. 



37 (38) Third and fourth joints of middle tarsi black-plumed, fifth joint silvery ; 



hind femora with more than one preapical bristle... 



18. popularis Wied. 



38 (37) Third and fourth joints of middle tarsi not plumed, but middle tarsi 



silvery at tip. 



39 (4(1) Hind tibiae black at tip only ; last two joints of middle tarsi silvery... 



19. signatus Meig. 



40 (39) Hind tibisD wholly black ; last joint of middle tarsi silvery; hind femora 



with more than one preapical bristle 20. urb anus M.e'ig. 



41 (24) All tarsi unadorned. 



12 (49) Basal joint of middle tarsi with one bristle above ; hind femora fringed 

 beneath. 



43 (46) Wings with a black costal swelling. 



44 (45) Antennae black, but tawny beneath basal joint 21. trivialis Hal. 



4-') (44) Antennae tawny, but dusky at tip 22. feslivus MaX. 



46 (43) Wings without any black costal swelling. 



47 (48) Hind tarsi pale at base 23. virgultorum'VfaW.. 



48 (47) Hind tarsi wholly black 24. arias^orwrn Stann. 



49 (12) Basal joint of middle tarsi without any bristle above. 



50 (53) Discal vein bent rectangularly, and usually with a small recurrent veinlet 



(coiif. H. diadema) ; front tibiae with a long thin hair at tip. 



51 (52) Basal joint of hind tarsi black at tip only ; hind femora not fringed 



beneath ; basal joint of hind tarsi with two bristles above... 



25. nitidus Fall. 



52 (51) Basal joint of hind tarsi wholly black; hind femora black fringed be- 



neath ; basal joint of hind tarsi with only one bristle above... 



26. griseipennis Stann. 



53 (50) Discal vein bent obtusely. 



