Atractus arangoi Prado 1939 .

Holotype ILS 136 (= actual acronym MLS) (fig. 30). “ Colombia.” R. P. Miguel de Ipiales, Jan. 1937.

Remarks: Adult. Junior synonym of A. major according to Schargel et al. (2013). The locality on the label is “Mocoa, Putumayo ” (Colombia), but this is erroneous. Prado (1939) assigned the locality to Colombia when described the species, and laterDaniel (1949) added that it was collected in Puerto Asís, Putumayo (Schargel et al. 2013) and not in Mocoa. Specimen MLS 136 is hydrated and in good state of preservation.