1	A. Venation reduced, forewing RS not reaching wing margin; widespread	2
–	B. Venation complete, or nearly so, forewing RS reaching wing margin; Nearctic	4
2(1)	A. Apical flagellomere narrower with a sharper apex. AA. Ovipositor longer, longer than first metasomal tergite; Neotropical	Lispixys
–	B. Apical flagellomere thicker, with a blunt apex. BB. Ovipositor shorter, barely exerted; widespread	3
3(2)	A. Hind wing 1A incomplete, clearly separated from cu-a. AA. Apical flagellomeres of female with a pair of ventral placodes widely separated; widespread	Paroligoneurus
–	B. Hind wing 1A complete, meeting or nearly meeting cu-a. BB. Apical flagellomeres of female with evenly spaced placodes; widespread	Oligoneurus
4(1)	A. Apical abscissa of forewing RS curved towards parastigma; crossvein r emanating near midlength of parastigma; crossvein 2cu-a absent or barely indicated leaving the subdiscal cell open; Canada, first record for the New World, rare	Pseudichneutes
–	B. Apical abscissa of forewing RS straight or curved towards apex of wing; crossvein r emanating basal to midlength of parastigma; crossvein 2cu-a long and distinct, closing the first subdiscal cell; Nearctic, common	Ichneutes