94 Journal New York Entomological Society. [Voi. xl 



40. Mandibles 3-dentate Baryconus ForsUr. 



41. Marginal vein longer than the stigmal vein; mandibles 3-dentate. 



Lapitha Ashmead. 

 Marginal vein shorter than the stigmal vein ; mandibles 2-dentate. 



Opisthacantha Ashnuad. 



42. Mesonotum with parapsidal furrows 43 



Mesonotum without parapsidal furrows 45 



43. Mesonotum with two furrows 44 



Mesonotum with three furrows. 



Postscutellum bidentate ; tip of abdomen ending in two short prongs. 



Hoploteleia Ashmead. 



44. Metathorax unarmed : mandibles 3-dentate Macroteleia IVestwood. 



Metathora.x bidentate; mandibles 2-dentate ? Cacellus Ashm. 



45. Postscutellum simple, not spined 46 



Postscutellum spined O^xsWiZiCQXiWidi Ashmead. 



46. Metathorax unarmed, simple 47 



Metathorax with two small teeth at apex ; mandibles 2- dentate.. Cacellus Ashm. 



47. Abdominal segments not strongly constricted 48 



Abdominal segments strongly constricted ; antennae subclavate. 



Cremastobseus Ashmead. 



48. Antennce subfiliform, slightly and gradually thickened towards apex, the flagellar 



joints after the first not or not much longer than thick. ..HadronotUS Fonfer. 



49. Submarginal vein usually reaching the costa, usually but not always stigmated at 



apex 50 



Submarginal vein not reaching the costa, ending in a knob...BaBOneura ForsUr. 



50. Submarginal vein ending in a stigma 51 



Submarginal vein not ending in a stigma. 



Mesonotum with two furrows ; marginal vein very short, the postmarginal 

 vein hardly developed or shorter than the stigma Idris Forster. 



51. Head without a frontal ledge or lamina 52 



Head with a frontal ledge or lamina. 



Scutellum quadrate, the hind angles acute ; postscutellum spined. 



AcanthOSCelio Ashmead. 

 Scutellum and postscutellum normal S^arnsiOU Jitritte. 



52. Mesonotum without furrows or rarely distinct 53 



Mesonotum with two furrows. 



Antennoe 12-jointed, long ; maxillary palpi long, 5-jointed. 



Sceliomorpha Ashmead. 

 Antennce lo-jointed, not long ; maxillary palpi short, 3-jointed. 



Scelio Latreille. 

 53.. Antennic lo-jointed ; maxillary palpi short, 3-jointed Scelio Latreille. 



Family LVII. PLATYGASTERID.i:. 

 This is probably one of the largest families in the superfamily 

 Proctotrypoidea, the most widely distributed and of great economic 

 importance, the species all being parasitic in dipterous larvae, belong- 



