1904.] 195 



IG (15) Tliii'd joint of antcnn.T rogiilarlyoviil tliniigh poinlecl ; arislii snbnpinul... 



0. planilarx'tH Fall. 



17 (2) Lower postociilar cilia palo. 



18 (19) Tibiae almost wholly black 0. niripes "Sli-'v^. 



19 (18) Anterior tibioe mainly femiginous. 



20 (21) Hind tibiiE blackish 10. phn-opux \\a\. 



21 (20) Hind tibiir blackish at tip only 11. vltripennis Meig. 



22 (1) Femora pale (occasionally dusky, eonf. 27 slgnifer, 28 clavijjes, and 44 



rupestrifi). 



23 (82) Lower postocular cilia pale. 



24 (35) Basal joint of middle tarsi witli a bristle above. 



25 (2G) Hind femora with more than one preapieal bristle. ..12. clnviqer Stann. 

 20 (2.5) Hind femora with only one preapieal bristle. 



27 (30) Antenna) nearly all black. 



28 (29) Front tarsi pale, with only last joint black 14. co)ifit<iu.i Zctt. 



29 (28) Front tarsi black, with only basal joint palo 21. Irivialis Ua,]. 



30 (27) Antennas mainly orange. 



31 (32) Hind tarsi pale at base 23. rlrf/nl/onnn Walk. 



32 (31) Hind tarsi wholly black. 



33 (34) Hind tibifE wholly yellow 21. arbu>^fornm ><Uwn. 



34, (33) Hind tibipe darkened at tip 22. fesfiuiis Hal. 



3.^ (24) Basal joint of middle tarsi without any bristle above. 



30 (37) Middle tibia; with two bristles beneath 13. disci fer Slann. 



37 (30) Middle tibiaj with only one bristle beneath. 



38 (39) Hind femora with more than one preapieal bristle (conf. 20 urhnmis, 



■which sometimes has two)... 18. popularis Wied. 



39 (38) Hind femora with only one preapieal bristle (unless occasionally 20 itrl.a- 



nus has two). 



40 (45) Discal vein bent rectangularly. 



41 (42) Face descending below eyes ; antennre all hhick..H(/ff roc. diadema Plal. 



42 (41) Face not descending so low as eyes. 



43 (44) Basal joint of hind tarsi nearly all black, and bearing only one bristle 



above 20. grixeipennis Stann. 



44 (43) Basal joint of hind tarsi black at tip only, and bearing two bristles above... 



25. nifidns Fall. 



45 (40) Discal vein bent obtusely. 



40 (49) Basal joint of hind tarsi with only one bristle above. 



47 (48) Femora mainly blackish 28. cJuvipes Hal. 



48 (47) Femora yellow 27. xignifer Hal. 



49 (40) Basal joint of hind tarsi with at least two bristles above. 



50 (51) Hind tibiaj nearly all black 20. nrhanux Meig. 



51 (50) Hind tibiiB yellow, unless at tip. 



52 (67) Antenn£e with not more than under-side of basal joint, or of that and just 



base of under-side of second joint, pale. 



53 (58) Face with faint but distinct pale pubescence ; antenna) practically ali black. 



54 (57) Wings more or less tinged with brown. 



55 (50) Hind tibia; at tip, and basal joint of hind tar.-<i, blackisli ; hind femoni 



with an obvious dark spot above near tip 3 k nubilus .Moij;. 



