^^^^ CLASSIFICATION 



231 



/Abdomen short, stout, very convex Stibasoma Schiner (America). 



L Abdomen not as in S<;6asoma =jo 



r Antenna; long and slender, first segment long 



I Acanthocera Macquart (South America). 



L Antennae not as in .4 canZAocera .. ,. ., _ ^jj 



( Slenderer in build, usually with thorax and abdomen banded ; third 

 ^ antennal segment slender, wings mostly with brown markings 



Dichelacera Macquart (South America). 



L Stouter m build, third antennal segment stout . . Taeanus Linn. 



II. PANGONIIN.E. 

 Ocelli usually present ; hind tibise spurred. 



2 



f Third antennal segment composed of eight or seven subsegments or 



I i rings ; proboscis usually elongate . . =2 



L Third antennal segment composed of five rings ; proboscis short = 14 



^ /Third antennal segment with a tooth Dicrania Macquart (Brazil). 



\ Third antennal segment not toothed .. .. .. .. = 3 



/Wings short ; body flat, eUiptical Apocampta Schiner (Austraha). 



\ Wings not short .. .. .. .. .. .. .. = 4 



f Third antennal segment with each subsegment branched 



4 ^ Pityocera Tos (Central America). 



L Third antennal segment not branched .. .. .. .. = 5 



f Upper corner of eye terminating in an acute angle 



5 "1 Goniops Aldrich (North America). 



L Upper corner of eye not terminating in an acute angle . . . . =6 



f Antennae deep-seated, inclined downwards ; palpi very large 



6 ■{ Cadicera Macquart (South Africa) 



L Antennas and palpi not as in Cadicera . . . . . . . . = 7 



f Antennae awl-shaped ; end of proboscis hatchet-shaped ; anal cell 

 J open and anal vein curved 



I Pelecorhynchus Macquart (Australia and S. America). 



L Antennae, proboscis, etc., not as in Pelecorhynchus = 8 



r Proboscis scarcely extending beyond palpi 

 8 <J Apotolestes WiUiston (California). 



L Proboscis extending beyond palpi = 9 



/"Wings with fourth posterior cell closed . . . . . . . . =10 



^ \ Wings with fourth posterior cell open .. .. .. .. =11 



/Eyes bare . . . . . . Dorcalcemus Austen (South Africa). 



"""^ \Eyes not bare Scione Walker (South America, Seychelles, Australia). 

 /Wings with first posterior cell closed . . . . . . . . =12 



'""■ ^ Wings with first posterior cell open .. .. .. .. =13 



/Eyes bare . . . . Pangonia Latr. (subgenus Pangonia). 



^^ \Eyes hairy . . . . Pangonia Latr, (subgenus Erephrosis). 



/Eyes hairy . . Diatomineura Rond. (subgenus Diatomineura). 



^^ \ Eyes bare .. Diatomineura Rond. (subgenus Con>oMe«ra Rond.) 



/First and second segments of antennae short .. .. .. =15 



4 "^^ First and second segments of antennffi long .. Chrysops Meigen. 



