8 BEACHYCJGEA. 



apart, but less so than in £ • First longi- 

 tudinal vein receiving others in it before 

 its tip. Thorax and scutellum with strong 



bristles and pubescence Apicceridae. 



Venation simple and reduced. Three pos- 

 terior cells. Eyes in <$ contiguous or 

 very approximate. First longitudinal vein 

 never receiving others in it. Species quite 

 destitute of bristles or pubescence Scenopinidae, 



12. Five posterior cells. Chaatophorous species, [p. 310. 



generally very pubescent also 13. 



Three or four posterior cells. Eremochsetous 

 species, except Bombyliidje and some 

 Syhphid^g 14. 



13. Vertex of head deeply sunken between the 



eyes, leaving the latter very prominent. 



Eyes in $ always separated Asilidae. 



Vertex not sunken, therefore eyes not pro- 

 minent. Eyes in J contiguous or closely 

 approximate t TVherevidae, p. 295. 



14. Third longitudinal vein generally forked. 



Posterior cross-vein absent. Eyes in tf 

 normally contiguous in typical groups, but 

 distinctly separated in Anthracinje ; con- 

 tiguous in both sexes in Systropus. Often 



densely furry species Bombyliidas, p. 173. 



Third longitudinal vein never forked. Pos- 

 terior cross-vein present. Eyes in $ con- 

 tiguous or approximate, except rarely; but 

 in CoisropiDiE wide apart in both sexes. 

 Normally not densely furry species, except 

 in some Syrphid^e 15. 



15. Proboscis rigid and geniculate. First pos- 



terior cell closed ; antennae with apical 

 style (Conopinve), or first posterior cell 

 open ; antennae with dorsal arista 



(MYOPiNiE) Conopidae. 



Proboscis soft. First posterior cell closed or 

 open. Antennas of very various formation. 16. 



16. First posterior cell closed. Vena spuria pre- 



sent (sometimes very faint). Eyes in both 



sexes of normal size and nature Syrphidae. 



First posterior cell open. Vena spuria absent. 

 Eyes in both sexes very large (especially 

 in PiPUNCULiDiE) ; some of the facets 

 often enormously enlarged 17. 



17. Arista dorsal, 3rd longitudinal vein well 



curved ; * apical section of 4th vein curved 

 downwards ; hind tarsi never dilated .... Pipunculidae. 

 Arista apical, 3rd vein nearly straight ; apical 

 section of 4th vein curved inwards. Hind 

 tarsi dilated Platypezidae, 



18. Venation abnormal ;t no obvious cross- vein [p. 390. 



Nearly straight in Ckalarus. 

 t Except in Opetia, a non-Oriental genus. 



