BRITISH FLIES 



27 



wing, causing the discal cell to be present even if extended 

 back to the wing-base. Face, mouth-margin, and jowls with- 

 out strong bristles. Thorax rarely with a soft pubescence. 

 Eyes of the male sometimes touching or approximated. 

 Imagines always predaceous. MICROPHONA. 



27 (28) Wings with at least the upper basal cell rather long, as the 

 radial and cubital veins diverge at about one-third of the 

 length of the wing, and the discal cross-vein is distinct ; 

 second basal and anal cells sometimes about as long as the 

 upper basal cell, but often shorter or the anal cell absent ; 

 discal cell often present and separated from the second basal 

 cell by a cross-vein ; cubital vein often forked. Alar squamae 

 small. Proboscis almost always horny, often long and pointed. 

 Antennae with the style or arista (if any) almost always apical ; 

 Abdomen normally with seven segments ; genitalia of the male 

 large and conspicuous. Colour never metallic green in palaj- 

 arctic species. XIII. EMPiDiE. 



Fig. 49. — Evijiis Irigravima J. x 0. 



In the Tachydrominoi the second basal cell and the anal cell 

 become small or the latter may be absent ; but in the Hybotinoi the 

 anal cell is long but not pointed, the lower branch of the postical vein 

 being curved down into the anal vein considerably before the wang- 

 margin ; in the Hyhotince, however, the second veinlet from the discal 

 cell is missing, and there are only four posterior cells even with the 

 inclusion of the anal cell. The proboscis is thick and almost fleshy in 

 Cliiiocem, etc. The antennte have a subdorsal arista in Ocydromia, etc. 



