255a (254b).    Abdominal petiole with distinct 2 segments and very thin; fore wing reticulate (=

 net-like); both fore and hind wings narrow at base into a linear stalk (Fig.A); mandibles

 with teeth exodont (extended outwards); antennal sockets closer to eyes than to each

 other (rare in North American collections)................................….............….........Mymerommatidae

 

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                                                       A

            

255b.    Abdominal petiole with 1 segment or none; fore wing membrane smooth, hind wing

 membrane not reaching base, but reduced to a linear stalk formed by submarginal vein

 (Fig.A); frons with H-shaped impressed lines (Fig.A ); antennal sockets much closer to

 eyes than to each other; egg parasites (common in North American collections)..............

 (Figs.B-H)..........................................................................................................…….............Mymaridae

 

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                                           A                                                          B                                    C

 

             D                                        E                                             F                                       G