Rosalba bucki (Melzer, 1934) (Figs. 54, 71) Aletretia bucki Melzer, 1934: 87; Blackwelder, 1946: 598 (checklist); Zikán & Wygodzinsky, 1948: 47 (types); Buck, 1959: 598 (distr.). Rosalba bucki; Breuning, 1971: 231; Monné & Giesbert, 1994: 189 (checklist); Monné, 1994: 5 (cat.); 2005: 309 (cat.); Monné & Hovore, 2006: 228 (checklist); Galileo & Martins, 2006: 240 (distr.); Monné, 2017: 269 (cat.). Aletretia mediofasciata Breuning, 1943: 38; 1947: 68 (type). Syn. nov. Rosalba mediofasciata; Breuning, 1960: 174 (cat.); 1971: 231; Monné & Giesbert, 1994: 190 (checklist); Monné, 1994: 7 (cat.); 2005: 310 (cat.); Monné & Hovore, 2006: 229 (checklist); Monné, 2017: 271 (cat.). Breuning (1971) separated R. bucki (Fig. 54) from his R. mediΟfasciata (Fig. 71) in the key as follows (translated): “Third antennal segment slightly longer than scape… mediofasciata BREUN. / Third antennal segment shorter than scape…… bucki MELZ.” Actually in the redescription of R. bucki he pointed out that the antennomere III is slightly shorter than scape. Actually, the information on the length of the antennomere III was not reported in the original description and the angle of the photo of the holotype does not allow seeing the proportions between it and the scape. The range from “slightly shorter” to “slightly longer” is controversial, and can reflect only sexual dimorphism or even specific variations. For example, in the “ typus ” of R. bucki, the antennomere III is slightly shorter than scape, while in the “cotypus” they have the same length. As we did not find any difference comparing the descriptions and types of R. bucki with photograph of the holotype of R. mediΟfasciata, we consider the latter as a junior synonym of the former. As strengthening this opinion, the examination of a specimen identified as R. mediΟfasciata in the MZSP collection, that is practically identical to the holotype of the species in color and shape of elytral drawings, has the antennomere III slightly shorter than scape.

Published as part of Santos-Silva, Antonio, Galileo, Maria Helena M., Joly, Luis J. & Tavakilian, Gérard L., 2018, The genus Rosalba Thomson, 1864 (Coleoptera, Cerambycidae, Lamiinae, Apomecynini), pp. 201-258 in Zootaxa 4387 (2) on page 237, DOI: 10.11646/zootaxa.4387.2.1, http://zenodo.org/record/1187360