210 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Mononotnm with two furrows. 



Antcniiio with 5 or (ijoiuti'tl cliih Antkris Foiuter. 



Antenna* filifonn, without a club ArEOt'H Fiirster. 



3. M»'H()ii()tnni with thrt'f distinct furrows. 



Mftascuti'lluin with 2er«'ct teeth lIori.oTEi.EiA, ^en. nov. 



Mesoiuititnt with 2 furrowH. 



Aixlouien very Ion;?, fusiform. 



Mt'tathorax uniinued; mandibles 3-dputate Macrotkl?:ia Westw. 



Mctathorax with 2 teeth (mandibles H-dtntato) Caci'8 Riloy 



Abilonicn not very long, ovate or oblong-oval. 



Metathorax unarmed; mandibles 2-deutate Anteris Fiirster. 



Meaouotuin without furrows. 



Meta.seutellum spined (Opi.itiiacantiia). 



Metascutelluni simple. 



Abdon,en with a horn at base \ JJ^Sl'^-'^! T"' f "'^ ^.^^'f "'^J-'t!' 



( Marginal vein long (Barvconus). 



Abdomen without a hjrn at base. 



Abdomen long, fu.iifonn; mandibles 2-dentate. 



Abdominal segments normal; antounal club 6- jointed.. Caci'S Riley. 



Abdominal segments strongly constricted; antounal club oval, 5- 



joiuted Cremastohakts, gen. nov. 



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



largest HadronoTIs P'iirster. 



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 postmargiual scarcely developed or shorter 

 than the stigmal. 



Mesonotuni with 2 furrows Idris Fiirster. 



Submarginal vein terminating in a thickened stigma. 



Head w ithout a frontal lamina or ledge ; postmargiual vein never developed . . 5 

 Head with a frontal lamina or ledge. 

 ScntellnuKiuadrate, the posterior angles acute; postscutellum with a largo 



erect spine Acanthuscelkj, gen. nov. 



Scutellum and postscutellum simple, not spined Sparasion Jurine. 



5. Mesonotuni without furrows, or very rarely with 2 distinct furrows. 



Maxillary palpi short, 3-jointed SCELIO Latreille. 



Mesonotum with 2 distinct furrows. 

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



MALES. 



Postmarginal vein wanting or never greatly developed, always shorter than the 



stigmal vein, the submarginal vein often never attaining the costa 



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



Postmarginal vein always greatly lengthened, the submarginal vein reaching 



the costa and never terminating in a stigma. 



Basal nervure wantfng 4 



Basal nervure present. 



Mesonotum without furrows 3 



Mesonotnin with 2 furrows. 

 Metathorax with no inclosed space at base. 

 Metascntellum not spined. 

 Marginal vein pnnotiform or never longer than the stigmal. 



Mandibles 3-deutate Cai.otkleia Westw. 



Mandibles 2-dentate Anteris Fiirster. 



