difficilis (Kröber), 1931g: 93 (Dichelacera). Type locality: Brazil, Amazonas, Tefé, and Guyana, Demerara. ST F (IZPAN). Distr.: Brazil, Colombia, Ecuador, Guyana. Refs.: Fairchild, 1971: 70 (cat.); Moucha, 1976: 203 (cat.); Fairchild & Burger, 1994: 106 (cat.); Coscaron & Papavero, 2009: 66 (cat.).