FAMILY CECIDOMYID.E THE GALL MIDGES 107 



21. Third vein extending to the apex of the wing 22 



Third vein not extending to the apex of the wing Epimyia Felt 



22. Palpi with four segments Johnsonomyia Felt 



Palpi with only one segment (29) Leptosyna Kieffer 



23. No crossvein uniting the third and first veins 29 



A distinct crossvein uniting the third and first veins 24 



24. Crossvein parallel or nearly so with the costa and apparently form- 



ing a continuation of the third vein 27 



Crossvein forming a well-marked angle with the costa 25 



25. Four longitudinal veins 26 



Three longitudinal veins (10) Colpodia Winnertz 



26. Fifth vein absent Parawinnertzia Felt 



Fifth vein well developed (13, 15, 25) Winnertzia Rondani 



27. Three or five longitudinal veins 28 



Four longitudinal veins (12) Asynapta Loew 



28. Three longitudinal veins Dirhiza Loew 



Five longitudinal veins Hormosomyia Felt 



29. Costa thickly scaled; third vein usually very close to anterior margin 



of wings; antennal segments cylindrical, sessile, short, never pro- 

 duced 30 



Costa rarely thickly clothed with scales, the third vein well separated 

 from it; antennal segments usually longer than wide 36 



30. Third vein, lying very close to the costa and uniting with it at or 



before the middle of the wing, rarely at the distal third 32 



Third vein well separated from the costa and uniting with it beyond 

 the middle of the wing 31 



31. Third vein and body thickly clothed with scales Trotteria Kieffer 



Third vein and body not thickly clothed with scales. 



Camptoneuromyia Felt 



32. Mouth parts and thorax normal, not greatly prolonged 33 



Mouth parts and thorax prolonged Clinorhyncha Loew 



33. Palpi with one or two segments Asteromyia Felt 



Palpi with three or four segments 34 



34. Third and foiirth antennal segments coalescent or closely fused 35 



Third and fourth antennal segments at least separated by a distinct 



constriction Protaplonyx Felt 



35. Three longitudinal veins, the fifth forked (1, 21) Lasioptera Meigen 



Four simple longitudinal veins Neolasioptera Felt 



36. Flagellate antennal segments cylindrical, never binodose in the male. . 37 

 Flagellate antennal segments in the male greatly produced, binodose; 



circumfila usually forming long loops 60 



37. Claws on at least one pair of legs toothed 38 



Claws simple 50 



38. Palpi with four segments 39 



Palpi with not more than three segments 45 



