NO. i20(;. ICHNE UMON FLIES— ASHMEA I). 8 5 



L'S. Metatliiirax at apex perju'iidiciilarly truncate, the carina' not ssharp, the petifjlar 

 and lateral apic^al areas confluent; first abdominal .sefiiiieiit at 

 apex twice as wide as at base; disco-cubital nervure broken l)y 

 a stump of a vein; antenn;e usually rintreil with white. 



(L'0!») llnrydot'mi Forster. 



Metatliorax at apex not perpendicularly truncate, the carin;e very sharp, the 



petiolar area separated from the lateral apical areas; first 



a))dominal segment at apex not nuich wider than at l)ase; 



antenna^ not ringed with white (-10) Pdtdolisjni Forster. 



2(1. Metathorax as seen from the side perpendicularly truncate, or almost 30 



Metatliorax as seen from the side not perpendicularly truncate 31 



30. Dorsal carina? of the first abdominal segment sharp and distinct from the base 



to beyond the middle; first joint of the flagellum scarcely longer 

 than the second, the latter distinctly longer than the third, the 

 ten joints before the last in female wider than long; marginal 



cell not longer than the stigma (211 ) Microtoru,s Fi'irster. 



Dorsal cariuje of first abdominal segment extending to the middle, but feel>Ie; 

 flagellum filiform, the first three joints much lengthened, slen- 

 der and often of an equal length; marginal cell longer than the 

 stigma ( 212 ) (Mhizeina F( Jrster. 



31. Glypeus mediallj' somewhat produced and deflected at the sides. 



(213) Chriodes Forster. 

 Clypeus not i^roduced 'medially and not deflexed at the sides. 



Antenna' not strongly thickened behind the middle 32 



Antenna" strongly thickened l)ehind the middle and the acuminate. 



(214) Agmtiu')ii's F(')rster. 



32. Head not nuich shortened, also not especially l)road nor lenticular 33 



Head nnich shortened, very broad and almost lonticular. 



First abscissa of radius usually small, scarcely longer than the transverse 

 cubital nervure, at the most one-eighth the length of the second 

 abscissa (215) Xenobrachya Forster. 



First abscissa of radius at least one-third tlie length of the second abscissa. 



(216) Brachycepludu.s- Forster. 



33. First abdominal segment not l)ent at the mid<lle, also not elevated 34 



First abdominal segment bent at the middle and somewhat elevated. 



(217) iVot'te-s' Forster. 



34. Last joint of maxillary palpi not longer than the penultimate and shorter than 



the third (218) llaplnaMei? Forster. 



Last joint of maxillary palpi longer than the i^enultimate. 



Scutellum laterally margined only at base 35 



Scutellum laterally margined to the apex. 



Spiracles of the third al)dominal segment placed far from the lateral 



margin ( 219 ) Gnotun Forster. 



Spiracles of the third abdominal segment placed quite near the lateral 

 margin ( 220 ) Itaninx F()rster. 



35. Metathorax with the areola toward the ])ase, not regularly and sharply pointed, 



usually hexagonal or wanting, the basal area not triangular. 36 

 ^Metathorax with the areola toward the base very regularly and shar|)ly 

 pointed, pentagonal, the l)asai area triangular. 

 Second and third abdominal segments sharply Imt finely aciculate. 



(221) Eudelus Forster. 



Second and third abdominal segments not transversely aciculate; wings 



fasciate (222) Idemuin Forster. 



