276 MEMOIRS OP THE CARNEGIE MUSEUM 



6. Fuiiicle filiform, the first joint large. 



Marginal vein slender, always longer than the stigmal vein ; abdomen ovate 7 



Marginal vein thickened, not longer than the stigmal vein. 



Body short ; clypeus bidentate ; mandibles 3-dentate Xenocrepis Forster 



(tyjje Csenocrepis arenicola Thorns.). 



7. Abdomen with a yellow band at base ; metathorax short, with a median carina and lateral folds ; cly- 



peus separated, anteriorly arcuate Dimachus Thomson (type Pteromalus discolor Walk.). 



Abdomen luithout a yellow band at base ; metathorax not short, without a median carina ; clypeus 

 separated, smooth, with a median tooth anteriorly. .Hemitrichus Thomson (type IT. rufipes Thorns.). 



8. Flagellum with the first joint short 9 



Flagellum with the first joint long, cylindrical 10 



9. Antennte short, clavate in both sexes, inserted a little below the middle of the face ; clypeus at apex 



truncate ; metathorax rather short, without lateral folds, the spiracles rounded. . . .Habritus Thomson 



(type Pter-omalus brevicornis Ratzeburg). 

 Antennse filiform, inserted on the middle of the face ; clypeus at apex with a median incision ; meta- 

 thorax not long, without a median carina, spiracles large, nearly linear Dinarmus Thomson 



(type D. acutus Thoms.). 



10. Antennse filiform, inserted on the middle of the face, the funicle joints all longer than thick ; clypeus 



anteriorly with a median sinus ; metathorax not short, without lateral folds, median carina, or spir- 

 acular sulci, the spiracles oval Arthrolysis Forster (type Pteromalus scabriculus Nees). 



11. Antennae 12-jointed, with tivo ring-joints 12 



Antennse 13-jointed, with two ring-joints 13 



12. Marginal vein not thickened, longer than the stigmal vein ; metanotum short, smooth but with a dis- 



tinct median carina, the. spiracles small Metastenus Walker. 



Marginal vein thickened, not longer than the stigmal vein ; metanotum punctate, with a median 

 carina Disema Forster. 



13. Pronotum not distinctly separated 14 



Pronotum distinctly separated 16 



14. Marginal vein slender, always longer than the stigmal vein 15 



Marginal vein thickened, not longer than the stigmal vein. 



Clypeus bidentate ; mandibles 3-dentate Xenocrepis Forster. 



15. Metathorax short, with a median carina Dimachus Thomson. 



Metathorax not short, without a median carina. Hemitrichus Thomson. 



16. Antennse inserted on the middle of the face, long 17 



Antenme inserted somewhat below the middle of the face Habritus Thomson. 



17. Metathorax without a median carina, the lateral folds present, the spiracles large, nearly linear. 



Dinarmus Thomson. 

 Metathorax without a median carina, the lateral folds absent, the spiracles oval. Arthrolysis Forster. 



Subfamily III. MISCOGASTERIN^. 



1833. Miscogasteridse, Family IV (partim), Walker, Ent. Mag., I., p. 370. 

 1835. Ormoceridse, Family (partim), Walker, Ent. Mag., I., p. 167. 

 1835. Pteromalidse, Family (partim), Walker, Ent. Mag., II., p. 286. 



