MONOGRAPH OF THE NORTH AMERICAN PUOL'TOTItYl'ID.E. 211 



Mar;:iiial vein Idiik'T tliiiu the stiKHiiil. 

 Muinlil>loM H-tlcntaio. 

 Fii'Ht ila<;i'li!ir joint Hcarcvly longer tliuii tlirtliinl, tlie tliinlexcitwd 



MACnOTKI.KIA WoHtW. 



First liii<;cllur Joint much lon<^c ■ thiin tlic third. 



IJAUYCoNirH Forstt-r. 



Mt'taMciitollnm Hpinetl OrisTiiA<'A\TiiA AHhm., gcu. uov. 



Mtituthorax with a laii;c m-niiciniilar incloHcd spac*' at haso. 

 Marginal vein pnnetit'urni; luundiblca 3-deutato. 



CiiKOMoTKi.KiA, gen. nov. 



3. MftaHcntelluni not spincd. 



Marginal vein pnnciiforui or never im long iiH the dtigniul. 

 Mandibles 3-dentate. 



First llajieilar joint very long Calotelkia Westw. 



First llagcllar Joint sliorter than secoiul Cacus Riley. 



Marginal vein long, always longer than the tstigmal. 



Mandibles 3-dcntate Uaryconus FOrster. 



Metascutellum spined. 

 Marginal voi't longer than thestignial; mandibles 3-»lentato..LAPiTiiA, gen. uov. 

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



OrisTiiACANTiiA Ashoi., gen. uov. 



4. Mesonotnni with three distinct furrows. 



Metascutellum armed with 2 teeth; tip of abdomen ending in two short prongs. 



HorLoTKLEiA Ashm., gen. uov. 

 Mescmotnm with two furrows. 



Metathorax unarmed; mandibles 3 dentate (MAcnoTEi.EiA). 



Metatiiorax with U small teeth; mandibles 2-dentate (Cacus Riley). 



Mesonotum without furrows. 



Metascutellum with a small acute spiue Oiusthacantiia Ashm., gcu. uov. 



Motascutelluin 8inii)le. 



Metanotum with 2 small teeth at ai)ex. 



Mandibles 2-dentate Cacus. 



Metanotum unarmed, simple. 

 Abdominal segments strongly constricted. 



Antenn;e subclavate Cremastob.eus, gen. nov. 



Abdominal segments nornuil. 

 Antenuie filiform, submoniliforui Haduonotus Forster. 



5. Snbmarginal vein not reaching the costa, knobbed B.eoneura Forst. 



Submarginal vein reaching the costa. 



.Submarginal vein not terminating in a stigma. 

 Marginal vein very short, the postmarginal scarcely developed or shorter 

 than the stigmal. 



Mesonotum with 2 furrows Idkis Forster. 



Submarginal vein terminating in a thickened stigma. 

 Head without a frontal ledge or lamina; postmarginal vein not developed. 6 

 Head with a frontal lamina or ledge. 

 Scutellum (juadrate, the angles acute ; the postscutellum spined. 



AcANTiioscELio, gen. nov. 

 Scutellum and postscutellum normal Sparasion Jurine. 



6. Mesonotum with 2 furrows. 



Maxillary i>alpi long, .5-Jointed; antenna' long, setaceous, 12-jointed. 



ScEiiOMORPHA, gen. nov. 

 Mesonotum wiihout furrows, or rarely distinct. 

 Maxillary palpi short, 3-jointed; antenn:e short, fusiforn, 10-jointed. 



ScELio Latreille. 



