FAMILY DRYOMYZID/E 383 



KEY TO GENERA 



1. First longitudinal vein bristled (3, 4) Neuroctena Rondani 



First vein wholly bare 2 



2. Only two pairs of scutellar bristles 3 



Three pairs of scutellars (O^doparea slauca Cot|uillett) (5, 6). 



QCdoparena, n. g. 



3. Costa not bristled 4 



Costa with conspicuous short bristles on the apical half (Helcomyza 



mirabilis Melander) (1, 2) Macromelanderia, n. g. 



4. Two pairs of dorsocentrals; face concave Dryomyza Fallen 



At least seven pairs of dorsocentrals; face not concave in profile. 



Heterocheila Rondani 



