46 Families and Gkxkisa or 



24. Upper side of the tliorax convex beliiiid 25 



Upper side of the thorax behind witli a soniewiiat concave de- 

 pression 40 



25. Fifth longitudinal vein altogetiier wantinjj. °AcHAL€r8 

 Fifth longitudinal vein distinct 2(i 



26. Distance of the posterior transverse vein from the margin of the 



wing equal to its own length or longer 27 



Distance of the posterior transverse vein to the margin of the 

 wing shorter than its own length 38 



27. Posterior transverse vein unusually oblique. * I'lagionki ri s 

 Posterior transverse vein but little oblique 28 



28. Hypopygium distinctlj' bent under the venter. . . 20 

 H^'popygium not distinctly bent under tlie venter or entirely im- 

 bedded 30 



29. The face of both sexes very broad, not narrowed superiorlj-. 



OThINOI'HILUS 



The face of both sexes rather narroj^', somewhat narrowed supe- 

 riorly Peodes 



30. Outer appendages of the hypopygium long, filiform. 



° Nematopkoctis 

 Outer appendages of the hyijopygium not long, nor filiform. 31 



31. Third joint of the male antennie conspicuously large. 



Leuco.stola 

 Third joint of male antennie small. ..... 32 



32. Pulvilli of the male fore tarsi consi)icuously enlarged. . 33 

 Pulvilli of the male fore tarsi not, or very slightly enlarged. 34 



33. Pulvilli of the male fore tarsi not prolonged. . ° Eitaksus 

 Pulvilli of the male fore tarsi prolonged. . . Diaphorus 



34. Arista altogether or almost altogether apical. . . . 35 

 Arista dorsal 3() 



35. Wings of considerable size (larger species). . Lyijoxeirls 

 Wings of small size (smaller species). . . Chrvsotus 



36. Legs of male with isolated, strong, spine-like bristles. 



oTeiciiopiioui s 

 Legs of the sexes without isolated, strong, spine-like bristles. 37 



37. Face not narrowed above SViMPTCNrs 



Face considerablv narroweil above. . . Campsicxemus 



