ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 249 



Abdomen ending in a long, distinct ovipositor, whicli is sometimes as long as the whole body. 



Acanthochalcis Cameron (type A. nigrescens Cameron). 



4. Abdomen much produced at apex, the eighth dorsal segment long, compressed, resembling a stj^lus 5 

 Abdomen normal, subglobose or ovate, the eighth dorsal segment never very long 11 



5. Scutellum normal, rounded behind, if with a slight plate behind the same is entire, not emarginate 6 

 Scutellum terminating in a projection or plate posteriorly which is usually emarginate 8 



6. Abdomen at base rounded, not truncate 7 



Abdomen at base truncate, the truncature bounded by a carina. 



Antennse 13-jointed, the flagellum long, slender, filiform. Phasgonophora Westwood 



(type P. sulcata Westw.). 



7. Eighth dorsal abdominal segment produced into a triangular stylus, the second segment (or the first 



body segment) occupying only about one third the length of the body ; autennte 11-jointed, sub- 



clavate ; Trigonura Sichel (type T. crassicauda Sichel). 



Eighth dorsal abdominal segment very long, compressed but not triangular, the second segment vari- 

 able, usually, however, occupying about half the length of the body ; antennse 11-jointed, filiform, 

 tapering toward tips Thaumatelia Kirby (type Chalets separata Walker). 



8. Scutellum with a short, thick projection behind 9 



Scutellum ending in a raised emarginate or bidentate plate. 



Metathorax unarmed 10 



Metathorax with two very prominent projections on each side, and very hairy. 



Abdomen with the eighth dorsal segment produced into a long stylus ; antennse 12-jointed. 



Megalocolus Kirby (type Halticella ducator Walker). 



9. Metathorax with two teeth on each side ; hind femora armed with 7 or 8 teeth beneath. 



Pseuedocholcis Kirby (type Halticella declarator Walk.). 



Metathorax produced and excised medially; hind femora unarmed Oxycoryphe Kriechbaumer. 



(type 0. subsenea Kriechb.). 



10. Marginal vein very short, the postmarginal and the stigmal veins abnormally long ; hind femora with 



numerous small teeth beneath (about 14) ; abdomen long, conically produced. 



Larradomorpha Stadelman (type L. insignis Stadelm.). 

 Marginal vein long, the stigmal vein normal, not very long. 



Hind femora armed with one long tooth followed bj' 6 or 7 smaller teeth ; antennse 11-jointed. 



Stypiura Kirby (type Chalcis conigastra Perty). 



Hind femora with numei-ous depressed punctures, and with about 6 large teeth beneath; antennse 



13-jointed Epitelia Kirby (type Chalcis stylata Walker). 



11. Antennse 13-jointed, with 1 ring-jointed, rather short ; hind femora armed with many minute teeth 



beneath Chalcis Fabricius (type Vespa minuta Linne). 



12. Scutellum posteriorly unarmed, normal 13 



Scutellum posteriorly armed, emarginate or produced 16 



13. Abdomen at base rounded, not truncate 14 



Abdomen at base truncate, the truncature bounded by a carina Phasgonopliora Westwood. 



14. Hind angles of metathorax rounded, not prominent 15 



Hind angles of metathorax prominent, acute, clothed above with usually a silvery white pubescence ; 



thorax coarsely punctate, the abdomen jiunctate or at least not entirely impunctate ; antennae 

 11-jointed, the flagellum filiform Acanthochalcis Cameron. 



