Aphiochaeta. 229 



2. Halteres black 3. 



— Halteres yellow 8. 



3. 1 double 2 + 3 or longer 4. 



— 1 not double 2 + 3 5. 



4. Upper supraantennal bristles more distant 

 than inner bristles of the middle row; an- 

 tennæ, frons and thorax reddish ; hind tibiæ 



simple (only female known) rufifrons Wood. 



— Upper supraantennal bristles nearer together 

 than inner bristles of the middle row; an- 

 tennæ, frons and thorax black; hind tibiæ 

 narrowed in the apical part (only male 



known) praeacuta Schmitz. 



5. Male palpi very large and with few bristles 



(only male known) longipalpis Wood. 



— Male palpi normal 6. 



6. Frons broader than high, inner bristle of 

 lower row not much lower than the outer; 

 upper supraantennal bristles more approxi- 

 mate than inner bristles of the middle row; 



wings a little milky (only male known). .. . 130. lactipennis Lundbk. 



— Frons only slightly broader than long or 

 about quadratic; inner bristle of the lower 

 rov much lower than the outer, upper supra- 

 antennal bristles more distant than inner 



bristles of the middle row; wings not milky 7. 



7. Costal cilia moderately short 131. gregaria Wood. 



— Costal cilia very short and fine 132. suhnudipennis Schmitz. 



8. 1 double 2 + 3 or, at all events, nearly so 9. 



— 1 not double 2 + 3, but distinctly shorter 13. 



9. Costa 0,33 of the wing-length or less; male 

 hypopygium without bristles 10. 



— Costa about 0,42 of the wing-length; male 



hypopygium with bristles virilis Schmitz. 



10. Costa 0,30 of the wing-length, costal cilia 



very short 135. Berndseni Schmitz. 



— Costa longer, cilia moderately short 11. 



11. Black or dark species 12. 



— Yellowish species hrachyneura Egg. 



12. Third abdominal tergite in female narrowed 133. pygmaea Zett. 



— Third abdominal tergite in female normal 



(only female known) 134. pygmaeoides Lundbk. 



13. Frons more or less shining 14. 



— Frons dull 17. 



14. Only one pair of distinct, strongly approxi- 

 mate supraantennal bristles, inner bristle 

 of lower frontal row nearer the middle than 



the eye-margin 136. angelicae Wood. 



