242 Journal New York Entomological Society. [Voi. x. 



Wingless forms.. 5 



Winged forms 3 



3. Front wings with the marginal vein linear, never stigmated 4 



Front wings with the marginal vein stigmated, or with a distinct stigma. 



Mandibles dentate ; antenna; 14- or 15-jointed ; claws simple or pectinate ; hind 



wings with a more or less distinct venation Family LL Helorid^. 



Mandibles edentate ; antennae 13-jointed with one ring-joint ( 12-jointed without 

 ring-jointed); claws simple ; hind wings without a distinct venation. 



Family LII. Proctotrypid.b. 



4. Front wings with a distinct basal cell and usually with a distinct marginal cell, 



the latter never wholly wanting although often incomplete ; hind wings always 

 with a basal cell ; antenna; 14-15-jointed ; labial palpi 3-jointed. 



Family LIII. Belytid.*:. 

 Front wings rarely with a distinct basal cell, the median vein most frecjuently ob- 

 solete or subobsolete, the marginal cell never complete, usually wholly wanting ; 

 hind wings always without a basal cell ; antenna- 1 1- to 14-jointed ; labial palpi 2- 

 jointed P^amily LIV. Diapriid.^. 



5. Mandibles edentate ; tip of abdomen stylate Family LII. PaoCTOTRYPiDyE. 



Mandibles dentate ; tip of abdomen not stylate. 



Labial palpi 3-jointed Family LIII. Belytid^. 



Labial palpi 2Jointed : Family LIV. DIOPRIID.^. 



6. Wingless forms 8 



Winged forms. 



Abdomen acute or margined along the sides and sessile- or subsessile 7 



Abdomen rounded at sides, never acute or margined ; front tibia; with the apical 

 spur, strongly forked ; antenna; in 9 lo- or ll-jointed, in $ ll-jointed ; front 

 wings always without a postmarginal vein, the stigmal vein long, the mar- 

 ginal vein either linear or stigmated Family LV. Ceraphronid.^. 



7. Front wings most frequently with marginal and stigmal veins ; antennas usually 12- 



jointed in both se.xes, sometimes in 9 il-jointed, or 7-jointed when the club 



joints coalesce and form a single large joint Family LVI. Scelionid^. 



Front wings always without marginal and stigmal veins and most frequently en- 

 tirely veinless, at most with only a submarginal or subcostal vein, which is 

 sometimes clavate at apex ; antenna never more than lo-jointed, usually with 

 the same number of joints in both sexes, rarely only 8- or 9-jointed. 



Family LVII. Pl.a.tygasterid.«. 



8. Abdomen along the sides rounded, not acute or margined ; front tibia; with the 



apical spur strongly forked Family LV. CeraphroniD/E. 



Abdomen with the sides acute or margined ; front tibi?e with one spur. 



Antennae 12-jointed, or if with a solid club 7-jointed; labial palpi two-jointed 



or more Family LVI. ScELiONiD^. 



Antennae lo-jointed or less ; labial palpi i -jointed. 



P^amily LVII. Platygasterid^. 



Family L. Pelecinid.-E. 

 This family is represented by a single genus, with several species, confined to 

 the New World, /. f., North and South America. 



