152 C. H. TYLER TOWNSEND. 



27. — A supernumeraiy marginal cross-vein connecting second vein a little before 

 its tip with costa, inner marginal cross-vein elongate; antenna 15- 



jointed Paratrope^^a. 



Only one marginal cross-vein 28. 



28. — Tip of first vein only a little beyond proximal end of submarginal cell. ..29. 

 Tip of first vein about as far beyond proximal end of submarginal cell as 



breadth of wing DicraiioptycliH. 



29. — Anal angle of wing nearly square, prominent; submarginal cell much lon- 

 ger thau first posterior, auxiliary vein ending in first vein.Aiitoolia. 

 Anal angle but little prominent, not at all square; submarginal and first 

 posterior cells nearly equal, auxiliary vein ending in costa. 



Teiicholabis. 

 .30. A supernumerary cross-vein present between fifth and sixth veins. 



Troeliohola. 



Xo such cross-vein present 31. 



31. — Proboscis longer than head and thorax together Geraiioniyia. 



Proboscis not longer than bead 32. 



.32.— .Toints of flagellum pedicelled, antennse pectinate, bipectinate, or subpecti- 



"ate Rhipidia. 



Antenna! joints neither pedicelled nor pectinate 33. 



33.— Tip of auxiliary vein usually opposite, anterior, or only a little posterior to 

 origin of second vein ; marginal cross-vein always at tip of first vein. 



Dicraiioinyia. 



Tip of auxiliary vein usually far beyond origin of second vein ; margitial 



cross-vein often some distance before tip of first vein . ...L<iiniiobia. 



3-1. — TibiiB without terminal spurs (subfam. Eriopterina) 35. 



Tibite with terminal spurs (minute in PhylloJahis. Rliaphidolabis and Plee- 



tromyia) , 49 



35. — Wings either distinctly pubescent on their whole surface, or with long pu- 

 bescence on the longitudinal veins 36. 



Wings eillier wholly naked, or with a scarcely perceptible pubescence on 



veins 41 



36.— Wings pubescent only on veins; discal cell present or absent 37. 



Wings pubescent on their whole surface; discal cell present or absent. 



Rliypholophus. 

 37. Praifurca ending in second submarginal cell, which is longer than first (genus 



Erioptera) 3g 



Prsefurca ending in first submarginal cell, which is longer than second. 



Hloloptiiliis. 



38. — Anterior branch of fourth vein forked subgen. Mesocyplioiia. 



Posterior branch of fourth vein forked .39. 



39.— Axillary cell broader in middle than near margin of wing. 



subgen. Erioptera. 



Axillary cell much broader near margin than in middle ; discal cell present.40 



40.— Fork of posterior branch of fourth vein emitting a stump of a vein from 



its angular anterior branch into the discal celL.subgen. Hoplolabis. 



Fork of posterior branch of fourth vein normal, emitting no stump, the two 



branches arcuate subgen. Ac.yplioiia. 



41.— Axillary vein very strikingly undulating fSiyinpleeta. 



Axillary vein straight, or only gently curved 42. 



