210 BULLETIN 45, UNITED STATES NATIONAL MUSEUxM. 



Mcsonotnm with two furrows. 



Anteunie with 5 or G jointed oliib Antkris Forster. 



Anteniiii'. filiform, without a chib Apegi's Forster. 



3. Mesonotuiii with three distiiitt furrows. 



Metascutellum with 2 erect teeth Hopluteleia, <;en. nov. 



Mesouotuni with 2 furrows. 



Alxlomeu A-ery long, fusiform. 



Metathorax unarmed; mandibles 3-deutate Macrotelkia Westw. 



Metathorax with 2 teetli (mandibles 3-deutate) Cacts Eiley 



Abdomen not very long, ovate or oblong-oval. 



Metathorax unarmed; mandibles 2-deutatc Anteris Forster. 



Mesonotum without furrows. 



Metascutellnm spined (Opisthacantiia). 



Metascutellum simple. 



Abdomen with a horn at base \ f.^^S^^^] ^^i" f "'^t 'in^'fji',™!- 



( Marginal vein long (Baryconus). 



Abdomen without a horn at base. 



Abdomen long, fusiform ; mandibles 2-dentato. 



Abdominal segments normal; antenna! club 6-jointcd..CACUS Riley. 



Abdominal segments strongly constricted; anteniial club oval, 5- 



joiuted Cre.mastoijaeus, gen. nov. 



Abdomen broadly oval, sessile, the second segment usually a little the 



largest Hadroxotts Forster. 



4. Submarginal vein not reaching the costa, knobbed. 



Wings narrow, fringed; abdomen much depressed, long and pointed. 



B.EOXEURA Forst. 

 Submarginal vein reaching the costa often by a thickened stigma. 

 Submarginal vein not terminating in a thickened stigma. 

 Marginal vein very short, the postmarginal scarcely developed or shorter 

 than the stigmal. 



Mesonotum with 2 furrows Idris Forster. 



Submarginal vein terminating in a thickened etigma. 

 Head without a frontal lamina or ledge ; postmarginal vein never developed . .5 

 Head with a frontal lamina or ledge. 



Scntelluui quadrate, the posterior angles acute; postscutcllum with a large 



erect spine Acantiiosceho, gen. nov. 



Scutellum and postscutcllum simple, not spined Sparasion Jurine. 



5. Mesonotum without furrows, or A^ery rarely with 2 distinct furrows. 



Maxillary palpi short, 3-iointed Scelio Latreille. 



Mesonotum with 2 distinct furrows. 

 Maxillary palpi long, 5-jointed Sceliomorpha, gen. nov. 



Postmarginal vein wanting or never greatly dcveh)ped, always shorter than the 



stigmal A-ein, the submarginal Acin often never attaining the costa 



and terminating in a large stigma, the abdomen long-fusiform. .. 5 



Postmarginal vein always greatly lengthened, the submarginal A'cin reaching 



the costa and never terminating in a stigma. 



Basal nerA'ure wanting 4 



Basal nerA'ure present. 



Mesonotum Avitliout furrows 3 



Mesonotum Avith 2 furrows. 



Metathorax with no inclosed si)ace at I)a8e. 

 Metascutellum not spined. 



Marginal A'ein puuctiform or never longer than the stigmal. 



Mandibles 3-dentatc Caeoteeeia Westw. 



Mandibles 2-deutate Anteris Forster. 



