the AsiVidx of Australasia. 161 



o. Wings with three submarpinal colls 6. 



Wings with two subniarginal cells 7. 



6. Second subniarginal cell at most halt' as 



long as the first subuiarginal cell Promachus, Loew. 



Second subraarginal coll as long or only a 

 little shorter than the first submarginal 

 cell Philvdictis, Wlk. 



7. Posterior branch of third vein curves for- 



ward to meet the costa at or before the 

 tip of wing; an appendix sometimes 



pi'esent 8. 



Posterior branch of third rein terminates 

 beyond the tip of wing; no appendix . . 9. 



8. Ovipositor cylindrical, with a terminal 



circlet of spines Troctacanthus, Macq. 



Ovipositor laterally compressed, without a 



terminal circlet of spines Era.v, Scop. 



Subgenera o/Asilus. 



9. Ovipositor laterally compressed 10. 



Ovipositor conical 17. 



10. Third joint of antennte unusually long and 



broad, flattened Glaphyropyga, Schiner. 



Third joint of antennae normal shape,- if 

 long always very long 11. 



11. End lamellae of ovipositor egg-shaped, 



wedged in ; thorax with bristles disposed 



like a mane Dysinachnu, Wlk. 



End lamellae of ovipositor free, style-like ; 

 thorax with bristles not disposed like a 

 mane 12. 



12. Posterior border of eighth ventral segment 



in male more or less widened. Ovi- 

 positor in female not so long as in 



Neoitamus Machiinus, Loew. 



Posterior border of eighth ventral segment 



in male not widened 13. 



18. Legs prevailing shining yellow Heliymoneura, Bigot. 



Legs prevailing black or light and opaque- 

 coloured 14. 



1 4. Male genitalia club-like ; ovipositor long, 



including the sixth and seventh segments. 15. 

 Male genitalia not club-like ; sixth and 

 seventh segments not included in ovi- 

 positor 16. 



It). Large species; third posterior cell very 



wide. Tibiaj black Pararatus, gen. nov. 



Small species ; third posterior cell not very 



wide. Tibife usually testaceous Neoitamiis, Ost.-Sack. 



16. Face with a very small tubercle. Legs 



mainly black Cerdistus, Loew. 



17. Large species; wing very much curved 



outwards at costal border in the male . . Neoaratus, Eicardo. 

 Wing not (or hardly) curved outwards at 

 costal border in male 18. 



18. Abdomen with no bristles before the seg- 



mentations; large or middle-sized, usually 

 bright-coloured species 19. 



Ann. & Mag. N. Hist. Scv. 8. Vol. xi. 1 1 



