CYRTIDJE). 



4. Wings with a stout costal spur near the tip of first vein (7,8) 



Pterodontia. 



Wings without such spur. ....... 5 



5. Proboscis small or vestigial* (5,6). . . . Oncodes. 

 Proboscis elongate, directed backward; prothoracic lobes broadly 



united above (3, 4) . Philopota. 



6. Venation complete; eyes pilose (fig. 66) . . . Opsebius. 

 Venation more or less obsolete; eyes bare (1, 2). . Acrocera. 



7. Proboscis very small, vestigial. ...... 8 



Proboscis elongate. ......... 10 



8. Eyes bare Appeleia. 



Eyes pilose or pubescent. .... ... 9 



9. Third joint of antennae with terminal bristly hairs. Pialeoidea. 

 Third antennal joint not with terminal bristly hairs (9, 1O). 



Ocnaaa. 



10. Ocelli wanting; large flies (13, 14) . .... Lasia. 

 Ocelli present; moderately large flies (11,12). . Eulonchus. 



* Compare Nothra americana Bigot. The occurrence of this genus 

 in North America is doubtful. If, however, Bigot correctly recognized 

 it, the species should be sought for under Oncodes. 



