primitivus Walker, 1848: 177 . Type locality: “South America ”. HT F (BMNH). Distr.: unknown. Refs.: Kröber, 1934: 303 (cat.; Tabanus (Macrocormus)); Fairchild, 1971: 99 (cat.); Moucha, 1976: 132 (cat.); Fairchild & Burger, 1994: 146 (cat.); Coscaron & Papavero, 2009: 140 (cat.).