The New World subfamily Stegaspidinae includes two tribes (Stegaspidini and Microcentrini) and a few taxa of uncertain position. The unplaced taxa, all from the West Indies, include the extant genera Antillotolania and Deiroderes, as well as undescribed fossils from Dominican amber. The diversity of pronotal forms found in this subfamily is extraordinary.
Neotropical and Nearctic regions: Argentina north into southern Canada, also Trinidad and the West Indies.
Pronotum simple, horned, foliaceous, inflated, umbellate, or some combination of these; posterior process absent (Antillotolania and Deiroderes) or present, not entirely concealing scutellum, length various, terminating from just over scutellum to beyond abdominal apex. Forewing vein M1+2 shifted toward leading edge of wing; distal m-cu crossvein basad of fork of M (exception: Smerdalea); claval apex acuminate. Abdomen without conspicuous pits.