FAMILY MYCETOPHILID/E — THE FUNGUS GNATS 125 



29. Subcostal crossvein well beyond origin of third vein; mesopleura bare. 



Megalopelma Enderlein 

 Subcostal crossvein just before, above or immediately beyond origin of 

 third vein 30 



30. Fifth vein forked; mesopleui'a with small hairs (10) . . .Sciophila Meigen 

 Fifth vein simple; mesopleura bare 31 



31. Macrotrichia (hair) reflexed toward base of wing (31) . . . Monoclona Mik 

 Macrotrichia decumbent (32) Acnemia Winnertz 



32. Seventh abdominal segment large in both sexes (for Polylepta lepto- 



gaster) Speolepta Edwards 



Seventh abdominal segment small and retracted, at least in the male. . 33 



33. Fifth vein forks well beyond fork of fourth (33) Coelosia Winnertz 



Fifth vein forks before, below or just beyond fork of fourth 34 



34. Auxiliary vein ends in the first vein 35 



Auxiliary vein ends in the costa 36 



35. Proboscis produced, about as long as the head (34) Hadroneura Lundstrom 

 Proboscis not produced (35) Dziedzickia Johannsen 



36. Proboscis very elongate (36) Gnoriste Meigen 



Proboscis not elongate 37 



37. Subcostal crossvein well beyond middle of auxiliary vein (Empalia) 



( 37 ) Synapha Meigen 



Subcostal crossvein absent or near middle of auxiliary vein (38, 55). 



Boletina Staeger 



38. Auxiliary vein ends in the costa (extremity may be faint in species 



of Leia) ". 39 



Auxiliary vein short, ending free or in the first vein 40 



39. Last section of first vein over twice as long as anterior crossvein; 



anterior branch of fourth vein in most cases detached at base; sub- 

 costal crossvein wanting (39) Rondaniella Johannsen 



Last section of first vein scarcely longer than the crossvein, in some 

 cases shorter (13) Leia Meigen 



40. Palpi minute, consisting of a single segment; female wingless; in the 



male the basal section of fourth and fifth veins are coalescent so 

 that both branches of the fifth appear to arise from the basal sec- 

 tion of the fourth vein (47) Pnyxia Johannsen 



Palpi well developed, female winged, venation various 41 



41. Lateral ocelli contiguous with the margin of the compound eyes; last 



section of first vein long, petiole of fourth vein short; hypopleura 



hairy (40) Docosia Winnertz 



Lateral ocelli remote from eye margins; last section of first vein 

 shorter 42 



42. Hypopleura hairy; hind tibial comb present (41). 



Megophthalmidia Dziedzicki 

 Hypopleura bare ; no tibial comb 43 



43. Auxiliary vein rather long, ending in first vein; fifth vein forks near 



base of wing Ectrepesthoneura Enderlein 



Auxiliary vein very short, ending free; fifth vein forks near the middle 

 of the wing (16) Tetragoneura Winnertz 



