NOKTH AMERICAN HYMENOPTEKA. 175 



Antenupe with tlie % 12-jointed (with the female 9-jointed) : marginal vein 

 lengthened and somewhat thickened towards the tip. 



* Genus Aiiaplies Haliday. 



Antenuse with the % 13-jointed (with the 9 9-jointed) ; marginal vein 

 linear, not thickened towards tip Genus Aiiagriis Haliday. 



Subfaniily Diaprin^e. 



Wings with a heart-shaped ]iiece cut out from tip. 



Genus EiitouiacJS Foerster. 

 Wings entire. 



Scape greatly developed (mesonotum without furrows). 



Genus Platymit^clius Westwood. 

 Scape not especially developed. 

 Scape with a knot at middle ; face greatly lengthened. 



* Genus Oalesus Curtis. 

 Scape without a median knot ; face not greatly lengthened. 

 Subraarginal vein not reaching costa. 

 Submarginal with a stigmal at tip. 



* Genus Aiieurhyiichii^ Westwood. 

 Sulunargiual simple, without stigmal, 9----CTenus L<aboIi|>S Haliday. 



Submarginal reaching costa. 

 3Iale. 



Anteunse P2-jointed Genus Ceplialoiioinia Westwood, %. 



Antenupe 13- or 14-joiuted. 

 Antenupe 13-jointed. 



First funicle joint hai'dly half as long as second. 



Genus Paramecins Westwood, % . 

 Fir.st funicle joint as long as, or longer than .second. 



Second abdominal segment with one or more pits at base. 



Marginal vein present Genus Idiotypa Foerster, % . 



Marginal vein absent Genus Heuiilexis Foerster, % . 



Second segment without pits at base. 



* Genus Spiloniicrns Westwood, % . 

 Antennpe 14-jointed. 



Wings without basal vein f Genus Diapria Latreille, % . 



Wings with a ba.sal vein. 



First funicle joint .shorter than second. 



■■ Genus Ba$«alys \Vestwood. % . 

 First funicle joint not shorter than second. 



Genus liOXOtropa Foerster, % . 

 Female. 

 Antenupe 12-jointed. 



Head large and tlat Genus Ceplialonoiuia Westwood, 9 . 



Head not large and flat. 

 Wings without basal vein. 



Mesonotum with plain furrows. 



Genus Olyptoiiota Foerster. 



