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