XIV] CLASSIFICATION 23I 



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



\ Abdomen not as in Stibasoma . . . . . . . . , . = 10 



f Antennae long and slender, first segment long 

 10 '^ Acanthocera Macquart (South America). 



I. Antennae not as in Acanthocera .. .. .. .. .. =11 



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

 J J J antennal segment slender, wings mostly with brown markings 



I Dichelacera Macquart (South America). 



I Stouter in build, third antennal segment stout . , Tabanus Linn. 



II. PANGONIINiE. 



Ocelli usually present ; hind tibiae spurred. 



f Third antennal segment composed of eight or seven subsegments or 

 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, elliptical Apocampta Schiner (Australia). 



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



f Third antennal segment with each subsegment branched 



4 1 Pityocera Tos (Central America). 

 I Third antennal segment not branched . . . . . . • • = 5 



f Upper corner of eye terminating in an acute angle 



5 ■{ 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 Antennae 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 



f Proboscis scarcely extending beyond palpi 

 8 <{ Apotolestes Williston (California). 



L Proboscis extending beyond palpi = 9 



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



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



/Eyes bare . . . . . . Dorcalamus 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 Corizoneura Rond.) 



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



\ First and second segments of antennae long . . Chrysops Meigen. 



14 



