MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 27 



Abdomen not margiuod at sides, sessile or subsessile. Anterior tibial spur 

 stronglyforkcd; antenna>.in $ usuallj' 10-11-jointed, in <? 11-jointed; 

 front wings never with a post-marginal vein, the stigmal vein long, 

 the margiual often stigmated Subfam. IV, Cerapiironin^. 



3. Front wings most frequently with marginal and stigmal veins; antennm 



in both sexes usually 12-jointed, in 9 sometimes 11-jointed, or 

 7-jointed when the claval joints coalesce.. .Subfam. V, Scelionin^. 

 Front wings always without marginal and stigmal veins and most frequently 

 entirely veinless, at the most with only a clavate submarginal 

 vein ; antenna' never more than 10-jointed, usually alike in both 

 sexes, rarely only 8- or 9-jointed Subfam. VI, Platygastekin.e. 



4. Front wings with the marginal vein linear, not stigmated 5 



Front wings with the marginal vein stigmated, the costal cell closed. 



Mandibles dentate; antenntc 15-jointed; claws pectinate, 



iSubfam. VI , Helorin^e. 

 Mandibles edentate; antenna' 18-jointed, with a ring joint; claws simple, 



Subfam. ^TII, Proctotrvpin.e, 



5. Front wings with a distinct basal cell and usuallv with a distinct mar- 



ginal cell (the latter rarely entirely wanting); hind wings 

 always Avith a basal cell; antennae 14 to 15 jointed; labial 



palpi 3-jointed Subfam. IX, Belvtin^. 



Front wings with the brachial cell seldom distinct, the median nervnre 

 Iteing usually obsolete, the marginal cell never complete, 

 usually entirely wanting; hind wings always without a cell; 

 antenna) 12-, 13-, or 14-jointed; labial palpi 2-jointed, 



Subfam. X, Diapriin.e, 



WINGLESS FORMS. 



6. Abdomen acutely margined at sides 7 



Abdomen not margined at sides. 

 Fore femora much swollen. 



Head oblong; antenuic 12-to 13-jointed in both sexes, inserted near the 



month Subfam. Bethylin>e. 



Head transverse or globose. 



Anterior feet normal ; antennaMU 9 13-jointed Subfam. EMBOLEMiNiE. 



Anterior feet chelate; antenna'- in 9 10-jointed Subfam. Dryinin^. 



Fore femora not much swollen. 



Mandibles edentate Subfam. Proctotrypin^. 



Mandibles dentate. 

 Antenna) inserted near the month. 



Anterior tibial spur 2-prouged Subfam. Ceraphronin^. 



Antennse inserted on a frontal prominence. 



Labial palpi 3-jointed Subfam. Belytin^. 



Labial palpi 2-jointed Subfam. Diapriin^. 



7. Antenna; 10-jointed ; labial palpi 1-jointed Subfam. Platygasterin^. 



AntennjB 12-jointed or witii a solid club 7-joiuted; labial palpi 2- or more, 



jointed Subfam. Scelioninje. 



Subfamily I. BETHYLIN^.l^. 



Head obloug, horizontal, the occipital line complete. Ocelli often 

 absent; when present .'i, triangnlarly arranged. Mandibles usually 

 large and broad, from 2- to (J-dentate. Maxillary palpi 4- to (J-Jointed; 

 labial palpi 2- to 3-jointed. Antennae not elbowed, filiform or setaceous, 



