46 GENERA OF HYMENOPTERA. 



Abdomen depressed, more or less compressed towards apex in 9 . the seg- 

 ments moderately long, the first segment shorter than i)()steri()r femora 



and trochanters combined Atraotodes Grav. 



Abdomen sessile or suhsessile, more or less depressed ; areolct small, ob- 

 lique or wanting; ovipositor sometimes long PleotiscuN Gniv. 



•22. --Antennse moderately separated from each other at their insertion; pectus 

 longer than broad; metathorax scarcely or a little longer than high; 

 third discoidal cell more or less narrowed at base, the ui)pcr nervure 



arched above Porizon (Jrav. 



Antennse remote from each other at their insertion ; pectus wider than long ; 

 metathorax shorter than high ; third discoidal cell r-^ctangular, scarcely 

 narrowed at base, the upper nervure straight. 



ThersilArhus Hohngr. 

 23. —Abdomen long, slender, sickle-shaped, twice as long as the head and thorax ; 

 posterior femora slender, with a short tooth beneath near apex, their 

 trochanters longer than their coxae; stigma moderate, niiirgiiial cell lan- 

 ceolate, areolet small, oblique, petiolate EiphoNOina (.'rests. 



Abdomen .strongly compressed towards apex, when viewed laterally, clavate, 

 a little longer than the head and thorax ; posterior femora robust, with 

 a stout acute tooth, directed backward.s, beneath at about the middle, 

 their trochanters shorter than their coxa» ; stigma large and liroad, mar- 

 ginal cell broad, subtrianguiar. areolet wanting.. PriNtoinorns Curt. 



24. — Tarsi slender 25. 



Posterior tarsi thickened, claws closely pectinate; head spherical, with 

 emarginate vertex, clypeus armed at the tip; metathorax without 

 areolae, the spiracles oval; first abdominal segment uniformly wide; 



areolet wanting -^Kcolobates Orav. 



25. — Tarsal claws not pectinate; abdomen .subpetiolate ; spiracles of metathorax 

 oviil ; eyes entire: third discoidal cell much narrowed at base, the upper 

 nervure much curved upwards and generally with a stump of a vein 



before the middle Exetastes (trav. 



Tarsal claws pectinate in one or both sexes; abdomen suKse.ssile; spiracles 

 of metathorax linear; third discoidal cell not or but slightly narrowed 

 at ba.se, the upper nervure straight and without the usual stump of a 

 vein. 

 .\bdomen depre.s.sed in ^ , acuminate and acutely pointed at tip in J, 

 with oljlique impressed line on each side of segments 2-4 above; scutel- 

 luni unarmed ; body smooth and polished ; posterior femora short and 

 robust; tarsal claws in % pectinate, in 9 toothed near tip; second 

 Joint of posterior trochanters swollen at tip Iwneath ; eyes entire. 



<'oraf ONoma (,'ress. 

 Abdomen more or less conii)res.sed and thickened at apex in both .sexes, 

 without oblique impressed lines; scutelluni often armed with a .spine; 

 posterior femora long and slender; tarsal claws pectinate in both sexes; 

 second joint of posterior trochanters not swollen at tip beneath ; eyes 

 feebly emarginate .BaiicliiiN Fabr. 



