Couplet 176

176a:  Body deep, mildly to distinctly wedge-shaped; antenna serrate, pectinate, or flabellate, often bipectinate or biflabellate; vertex often inflated and narrowed above eyes in frontal view; vertex usually extending dorsally above plane of pronotum in lateral view, vertex and pronotum at least coplanar; tarsi toothed, bifid, or pectinate; maxillary lobes sometimes stylet-like, extending beyond tips of mandibles

Ripiphoridae   p. 435

176b:  Body usually not deep and wedge-shaped, if so, then antenna simple and head coplanar with or slipping under front margin of pronotum; tarsi variable; maxillary lobes not stylet-like