Aphiochaeta. 227 



— Costa not thickened; hypopygium with or 



without bristles 39. 



34. Halteres dark or black 35. 



— Halteres yellow 37. 



35. Costa in female much thickened, broader than 

 the subcostal cell, and also a little thickened in 



male 109. crassicosta Strobl. 



— Costa in female moderately thickened, not as 

 broad as the subcostal cell, in male not thick- 

 ened 36. 



36. Costa in female conspicuously swollen, costal 

 cilia moderately long, costa not beyond middle, 



1 equal to 2 denotata Wood. 



— Costa in female less swollen, costal cilia very 

 long, costa reaching beyond middle, 1 longer 



than 2 110. tumida Wood. 



37. Costa in female much thickened, broader than 



the subcostal cell; yellowish species 38. 



— Costa in female moderately thickened, not as 

 broad as the subcostal cell; black or blackish 



species 111. suhtumida Wood. 



38. Thickening of costa stops before the inner 



branch of the fork costalis v. Ros. 



— Thickening of costa reaching to the end (only 



female known) 112. hrunneipennis Costa. 



39. Halteres black or dark (in discreta female often 



dusky yellow) 40. 



— Halteres yellow 44. 



40. Costa not reaching to the middle; antennæ 



brown 41 . 



— Costa reaching to the middle or beyond; an- 

 tennæ black 42. 



41. Costal cilia moderately long; angle at fork 



somewhat large; hypopygium with bristles.. 113. discreta Wood. 



— Costal cilia long; angle at fork acute; hypo- 

 pygium without bristles 117. analis Lundbk. 



42. 1 about equal to 2, shorter than 2+3; hypo- 

 pygium long and cylindrical, longer than sixth 



segment (only male known) 114. setijera Lundbk. 



— 1 longer than 2 + 3 or at least as long ; hypo- 

 pygium shorter than sixth segment 43. 



43. 1 double 2 or about 115. fusca Wood. 



— 1 not double 2 116. angusta Wood. 



44. Hypopygium with bristles; 1 distinctly longer 

 than 2 -f 3, or if not costal cilia more or less 

 moderately long 45. 



— Hypopygium without bristles; 1 generally not 

 longer than 2 + 3, costal cilia long (only in 



15* 



