2 families, both in our area, with ca. 800 described and 2000 estimated spp. worldwide and just over 100 spp. in our area(1)(2)
If wings present and developed, fore wing with basal part of anterior margin bordered by a sclerotized or tubular vein. Metasoma with apparent tergum 1 very large (true tergum 1 very small and invisibly fused into anterior of tergum 2), at least as wide as and as long as, or longer than, following terga combined. Fore wing with only 1 vein close to anterior margin, the one bordering it.
If wings absent or undeveloped, pronotum in lateral view extending to tegula, or thorax greatly modified and tegula absent; integument thick, body rarely collapsed in air-dried specimens; antennae inserted very close to mouth; metasoma with 6-8 visible terga; scape at least five times as long as maximum width; body less than 3 mm long; metasoma not lens-shaped in cross section, about as wide as high, with sides rounded; metasoma with apparent tergum 1 largest, at least three times as long as any other tergum; antenna with more than 5 flagellomeres (2)