SCENOPINIDAE OF THE WORLD 17 



Frons rugose, hiilter knob variable, white to brown 



S. fenestralis (Linnaeus) 

 o. Vein R4 branching well before middle of cell R.5 . . S, glabrifrons Meigen 



Vein R4 branching near middle of cell R5 S. saini, new species 



4. Wing brown or tinged brown 5 



Wing milky or grayish 7 



o. Halter knob brown or black-brown 6 



Halter knob white, abdomen with 6 white dorsal stripes . . S. griseus Krober 

 (). Halter knob black-brown, eyes widely separated, uniform facets, abdomen 



normal length S. niger DeGeer 



Halter knob brown, eyes nearly touching, divided into upper and lower facets, 

 abdomen short and broad S. microgaster Seguy 



7. Halter knob white 8 



Halter knob brown on top white below S. opaculus Loew 



8. Third antennal segment long and narrow 9 



Third antennal segment short, swollen at base . . . S. antennatus (Krober) 



9. Abdomen with three stripes, first broad, second and third narrow 



S. albicomus, new species 

 Abdomen with three broad white stripes S. physadius (S6guy) 



PALAEARCTIC SPECIES (FEMALES) 



1. Wing hyaline 2 



Wing brownish or milky white 4 



2. Frons shining, halter knob white or brown 3 



Frons rugose, halter knob variable brown to white . S. fenestralis (Linneaus) 



3. Halter knob white S. glabrifrons Meigen 



granular S. lesinensis Strobl 



Halter knob brown S. vitripennis Meigen 



4. Wing smoky white 5 



Wing brownish 6 



5. Halter knob white S. physadius (S6guy) 



Halter knob light tan S. opaculus Loew 



6. Halter knob red-brown, brown or black-brown; antenna variable .... 7 

 Halter knob light tan; antenna elongate, red-brown . S. efflatouni, new species 



7. Halter knob brown or black-brown; antenna variable 8 



Halter knoV) red-brown above, cream below; third antennal segment black, 



granular S. lesinensis Strobl 



8. Halter knob brown 9 



Halter knob black-brown 10 



9. Antenna short, oval; voin R4 branching from near middle of cell R5, abdomen 



short S, microgaster (S^guy) 



Antenna long, narrow; vein R4 branching from basal third of cell R5, 

 abdomen normal S. sinensis (Krober) 



10. Cell R5 open at end of wing, marginal length nearly equal to length of r-m 



cross vein S. japonicus (S6guy) 



Cell R5 closed at end of wing, marginal length only half the length of r-m 

 cross vein S. niger (DeGeer) 



1. Scenopinus albicomus, new species 



Figure 2 



Male. — A moderately laro;e black-brown fly typical of the group. 

 Head black-brown; eyes black, tinged with red, the upper two-thirds 



