ASHMKAD : CLASSIFK'ATION OF THE CHAI.CID FLIES 275 



Head and thorax finelj' rugulose ; marginal vein not longer than the stigmal, the latter straight but ob- 

 lique, not curved, postmarginal vein longer than the stigmal ; antenna 13-jointed with two ring- 

 joints Alloderma xVshmcad. 



20. Antenna; 12-joiuted Gastrancistrus Westwood. 



Antenna; 13-jointed Oxyglypta Forster. 



21. Front wings normal 22 



Front wings abnormal, the portion comprising the costal cell (Iilate<l and ohliiiucly truncate at the 



juncture of the submarginal vein with the marginal ; antenna' l:'.-j(iinted. .. .Epicopterus Wcstwood. 



22. Antennie 13-jointed, with two or three ring-joints 26 



Anteunje 11- or 12-jointed 23 



23. Thorax at most sparsely punctate or nearly smooth 24 



Thorax slightly rugulosely punctate ; antenuic 12-jointed Syntasis Walker. 



24. Wings with marginal ciliie 25 



Wiugs without marginal ciliaj. 



AnteuusB 12-jointed with one ring-joint Cecedoxenus Ashmead. 



Antenuse 11- or 12-jointed with two ring-joints. 



Antennffi 11-jointed, with two ring-joints Syntomocera Fiirster. 



Antenna; 12-jointed, with two riug-joints Asematus Forster. 



25. Antennse 13-jointed Semiotellus Westwood. 



26. Antennae with two ring-joints 27 



Antennae with three ring-joints .Spocerus Mayr. 



27. Metathorax short, with a median carina Terobia Forster. 



TiUBE II. Mctastenini. 

 The species falling in this tribe are easily separated from tlK)se in the tribe 

 Tridymini by mesonotal characters, the parapsidal furrows being incomplete. 



TABLE OF GENERA. 



1. Females 2 



Males 11 



2. Antennte 12-jointed, with two ring-joints 3 



Antenna; 13-jointed, with two ring-joints "i 



3. Flagellum inera.ssated ; mandibles 3-dentate, the malar space not large ; nietanolum short, smooth, with 



a distinct median carina, the spiracles small ; marginal vein longer than the stigmal vein, the post- 

 marginal very long Metastenus Wallier (type M. concinus Walk.). 



Flagellum at the most subclavate, the club S-jointed ; mandiljles (?) 4-dentate, the malar space large ; 

 axilla; widely separated ; metanotum punctate, witli a median carina ; marginal vein thickened, as 

 long as the stigmal vein, the postmarginal longer Disema Forster (type D. pallipes Forster). 



4. Tip of antenna; normal, not ending in a spine •"' 



Tip of antenna; ending in a spine, as in Rhaphitrle>f Walk., the flagellum long and slender, the fuuicle 



joints all long; left mandible 3-, the right 4-(lentate ; metathorax not short, without a median 

 carina, the spiracles large, oval ; abdomen large, depressed, very much longer than the head and 

 thorax united Stylophorella Ashmead, g. nov. (type .V. perplexa Ashm.). 



5. Pronotum not distinctly separated 6 



Pronotum distinctly separated 8 



