Genus Billaea Robineau-Desvoidy

Theresia Robineau-Desvoidy, 1830: 325 . Type species, tandrec Robineau-Desvoidy (mon.) (= Musca rutilans Fabricius).

Billaea Robineau-Desvoidy, 1830: 328 . Type species, grisea Robineau-Desvoidy (mon.) (= pectinata Meigen). Refs.: Thompson, 1963a: 522 (as Paratheresia, key to Trinidad genera); Guimarães, 1971a: 37 (as Paratheresia, cat.); Guimarães, 1977 (as Paratheresia, rev., key to species); Wood & Zumbado, 2010: 1381 (key to Central American genera of Tachinidae).

Paratheresia Townsend, 1915b: 65 . Type species, signifera Townsend (orig. des.) (= claripalpis Wulp).

Bathytheresia Townsend, 1928: 146 . Type species, bassleri Townsend (orig. des.) (= claripalpis Wulp).

Parabyllaea Blanchard, 1937: 44 . Type species, rhynchophorae Blanchard (orig. des.).