Tlie bifurcation of the second and tlurd veins takes place at a >;rcater 



distance from tlie cross-vein, usually at an acute angle. . . 1.'] 



2. Antennal style distinct, that is it is separated from the third joint or 



from the styliform prolongation of the joint by a distinct suture, o 



The third joint not with a distinct style separated by a suture, the style 

 when present very minute. ....... 8 



G. Antennal style with a ])encil of hairs at tlie tip; pulvilli distinct; front 

 tibiae with bristles. ......... 4 



Antennal style not terminating in a pencil of hairs; three or four sub- 

 marginal cells present. 5 



4. Outer submarginal cell bisectetl by a cross-vein {Spogosti/Itnn Coquil- 



lett non Macquart). ..... Coquillkttia, iiov. 



Outer submarginal cell not bisecteil by a cross-vein, the anterior branch 

 of the third vein sometimes connected with the second by a cross- 

 vein (Argyramaba Schiner). . . Spogostylum Macquart. 



5. Pulvilli distinct Aldrichia Coquillett. 



I'ulvilli rudimentary or wanting ....... 



(j. The outer submarginal cell divided by a cross-vein, making four sub- 

 marginal cells Hypkralonia Kondani. 



The outer submarginal cell not divided l)y a cross-vein. . . 7 



7. First posterior cell bisected near its middle by a cross-vein. 



ExoPTATA Coquillett. 

 First posterior cell not bisected ; posterior claws with a basal tooth. 



ExopROSOPA Macquart. 



8. Eyes of male contiguous at the vertex; anal cell closed. 



AsTKOPHANES Ostcn Sackcu. 

 Eyes of male not contiguous at the vertex; anal cell o])en. . . 9 



9. Anal cell widest at its middle 10 



Anal cell widest at the margin Mancia Coquillett. 



10. The second vein strongly contorted at the end in the shape of a recum- 



bent letter S ; three submarginal cells present. 



DiPALTA Osten Sacken. 

 The second vein not strongly contorted at the end. ... 11 



11. Three submarginal cells normally jiresent ; proboscis elongate. 



Stonvx Osten Sacken. 

 Two submarginal cells normally present. . . . . .12 



12. The contact of the discal cell with tlie third posterior not much longer 



than its contact with the fourth posterior; proboscis long; sides of 

 tiie abdomen with fringe of s(!ales and not with hairs only. 



liiM'iDANTURAX Ostcn Sackcu. 

 8 



