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Family SPHEGIGASTRIDES. 



Upper wiii-s \viili a delicate marginal vein, petiole punctate above, longer tlian 

 broad. 

 I'etiole longer than the posterior coxee; (^ palpi normal. 

 Head with compressed cheeks; vertex not very narrow. 



Parapsides discernible *Genus Merismus Walker. 



I'arapsides not plainly discernible. 



.Abdominal joints 2 and 3 very large ..*Genus Sphegigaster Spinola. 



.Abdominal joint 2 very large, others short, often retracted 



*Genus Cryptoprymnus Foerster. 

 Head with rounded cheeks, sub-lenticular, vertex narrow ; postpetiole very large; 



collar broad *Genus Syntomopus Walker. 



I'etiole not longer than posterior coxi^; second segment of abdomen deeply emargi- 

 nate and third very large; (^ palpi abnormal. 



Vertex acute in the middle; parapsides not plainly discernible 



*Genus Cyrtogaster Walker. 



Vertex not acute medially; parapsides plainly discernible 



*Genus Polycystus WVstwood. 

 Upper wings with a thick marginal vein; petiole shorter than the posterior coxa;. 



Parapsides plainly separated; stigmal club large *Genus Pachycrepis Foerster. 



Parapsides not plainly distinguished Genus Pachyneuron Walker. 



Tribe DIPARIDES. 



I'etiole Nhortcr than posterior coxns; ^ antennae not veiticillate-pilose 



*Genus Panstenon Walker. 

 I'etiole linear, longer than coxae; postpetiole very large; <^ antennae with well separ- 

 ated joints, sparsely verticillate *Genus Dipara W^alkcr. 



Tribe PTEROMALIDES. 



Posterior libiiv 2-spurred *Geims Dimachus. 



Posterior tibiae i -spurred. 



Antennal club subulate O, or conico aciuninate (^; metathorax punctate, no fold 



and no spiracular sulcus Genus Merisus Walker. 



.\ntennal club not subulate. 



Antennas inserted below the middle of the face; stigmal club scarcely discernible; 

 vertex not medially acute; cheeks round; abdomen not rotund; left mandible 

 3-, right 4-dentate; joint i ol the antenna! funicle equal to the others in size, 



rarely abruptly .smaller (}enus Eutelus Walker. 



Terebra exserted ; funicle of antennie thick, joint i in the ^ abiuptly smaller: 



thorax above smooth ; metathorax very short 



Genus Roptrocerus Ratzeburg. 



Joini I ijf the antennal funicle most usually large, very rarely abruptly smaller 



than the others; posterior coxae not pubescent on the hind margin at base; 



left mandible usually 3-dentate, dentations bioad at base 



■•Genus Aetroxys Westwood . 

 .Anterior margin of the collar sharp, acutely reflected; mandibles acutely 4- 



dentate *Genus Isocyrtus Walker. 



Head with the vertex sometimes medially acute; eyes occasionally hairy; mandi 

 bles usually 4-dentate; antennae often inserted below the middle of the face; 

 ling joint plainly discerniljle; metathorax usually punctulate and furnished 



