Key to Nearctic genera of Mymaridae . Females.

1 Wings short, not extending beyond apex of gaster, or absent................................................... 2

- Wings fully developed, extending beyond apex of gaster...................................................... 4

2(1) Tarsi 4-segmented.................................................................. Cleruchus Enock, part

- Tarsi 5-segmented.................................................................................... 3

3(2) Wings and ocelli absent (Fig. 274)....................................................... Chrysoctonus Mathot Fauna: 1 described species. Distribution: eastern Nearctic, mainly in bogs.

- Wings present, though sometimes minute and scarcely visible, and ocelli present.......... Ooctonus hemipterus Haliday

4(1) Tarsi 5-segmented.................................................................................... 5

- Tarsi 4-segmented................................................................................... 19

5(4) Funicle 8-segmented.................................................................................. 6

- Funicle at most 7-segmented........................................................................... 10

6(5) Face with subantennal sulcus extending from each torulus to mouth margin (Fig. 453); pronotum longitudinally divided medially, the two lobes either abutting (Fig. 445) or separated by membranous area (Fig. 551); propodeum without carinae (Fig. 458) or with 2 longitudinal submedian sulci or carinae, sometimes with additional lines between them (Fig. 445); metasoma with petiole at most about 2× as long as wide but usually much shorter and, in lateral view, with gt 1 at most only slightly longer than gt 2; fore wing with hypochaeta about midway between proximal and distal macrochaetae (Figs 340, 450, 464, 554)....... 7