Idalus occidentalis (Rothschild, 1909)

Type locality. Peru, [Puno], La Union, Carabaya .

Type specimen. Lectotype ♁ designated by Watson (1975: 81) (NHMUK).

Taxonomic references. Rothschild (1909), Watson (1975), Watson & Goodger (1986), Vincent & Laguerre (2014) and Laguerre (2016).

Material examined. Brazil, Maranhão: Caxias, Chapada, 4°57'41,1"S / 43°29'37,3"W. Light traps, 12– 13.vii.2015, K.M.O. Silva, S. Pereira, P.J.A. Santos, A.F. Teixeira legit, 1 ♀ (CZMA) ; Caxias, Inhamum Ecological Reserve, 4°53'52"S / 43º26'02"W. Light traps, 09–10.vi.2005, F. Limeira-de-Oliveira legit, 1 ♁ (CZMA) ; idem, 4– 08.viii.2005, 1 ♁ (CZMA); Mirador, Mirador State Park, 6°24'46.97"S / 44°28'47.03"W. Light traps, 19–20.xii.2006, R.O. Souza, J.C. Silva legit, 1 ♁ (CZMA) ; idem, 4–08.ii.2011, F. Limeira-de-Oliveira legit, 1 ♁ (CZMA) .

Material not examined. Brazil, Maranhão: Feira Nova do Maranhão, Retiro, 7°00'31"S / 46°26'41"W. Light traps, 15–17.iv.2013, C. Mielke legit, 1 ♁ (MLC) (Laguerre 2016).

Months records in Maranhão. February, April, June, July, August, December and November.

Geographical records in Brazil. Pará (Amazon), Tocantins (Cerrado), Rio de Janeiro (Atlantic Forest) and Rio Grande do Sul ( Atlantic Forest and Pampas).