XI V] CLASSIFICATION 231 



/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 

 IT J antennal segment slender, wings mostly with brown markings 



f Dichelacera Macquart (South America). 



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



II. PANGONIINNE. 

 Ocelli usually present ; hind tibiae spurred. 



f Third antennal segment composed of eight or seven subsegments or 

 i { rings ; proboscis usually elongate . . . . . . . . = 2 



I 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 { 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). 



I 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 

 ! open and anal vein curved 



I Pelecorhynchus Macquart (Australia and S. America). 



I 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 



9 \Wingswithfourthposteriorcellopen .. .. .. .. =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 Pangonid). 



\Eyeshairy . . ' .. PANGONIA Latr. (subgenus Erephrosis). 



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



X 3 \Eyes bare . . DIATOMINEURA Rond. (subgenus Corizoneura Rond.) 

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

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



