The primary types of some species of Centris bees described by European entomologists in the 18 and 20 centuries (Hymenoptera: Apidae) Vivallo, Felipe European Journal of Taxonomy 2023 2023-03-27 864 1 27 Jensen-Haarup, 1908 Jensen-Haarup 1908 [568,1020,264,291] Insecta Apidae Centrislyngbyei CoL Animalia Hymenoptera 10 11 Arthropoda genus   Fig. 2B  Centrislyngbyei Jensen-Haarup, 1908: 107–108.    Typedata To describe this species, Jensen-Haarup mentioned that he studied four femalescollected in Chacras de Coria, Argentina.However, the characters cited in the description belong to males, not females.The lectotypespecimen was designated by Zanella (2002)and it bears the following data label: [black-rimmed]  Centris lyngbyei n. sp.J.- Hrp [handwriten] Jensen-Haarup det. [printed]\ [black-rimmed] Chacr. de Coria Prov. de MendozaRep. ArgentinaJensen-Haarup [handwritten]\ [black-rimmed] Type Coll. J = Hrp. [handwritten]\ [red label] Holo [handwritten] TYPE [printed]\ [white label with black discontinuous strokes]  Centris tricolor♀ [handwritten] 1907 Friese det. [printed] Fr. [handwritten]\ [pink label] LECTOTYPE  Centris lyngbyei Jensen-Haarup, 1908F. Zanella, 1999[printed]\ ZMUC 00240257 [printed] (NHMD) ( Fig. 2B).    Typelocality  Argentina: Mendoza Province, Chacras de Coria.  Johann Christoph Friedrich Klug Johann Christoph Friedrich Klug (1775‒1856) was a German entomologist. He taught medicine and entomology at the Universität zu Berlin(currently the Humboldt-Universität zu Berlin) where he also worked as curator of the insect collection ( Gerstaecker 1856). He died in Berlin, aged 80.   Klug’s  Centrisbees In 1810, Klug proposed  Ptilotopusas a new genus, including in it a single species that he described simultaneously. The species is currently considered valid, but the genus was later downgraded and included as a subgenus of  Centris.   Fig 2.Data labels. A.  Centris zonalis Dominique, 1898(lectotype ♀). B.  Centris lyngbyeiJensen- Haarup, 1908 (lectotype ♂). A couple of years before that publication, Klug (1808)published an article on sexual dimorphism in Hymenoptera, citing some examples in several genera of wasps, ants and bees. Among his comments on species of  Centris, he cited “  byssina”, a species of  Hemisiathat had previously been named by the German entomologist and zoologist Johann Karl Wilhelm Illiger (1775–1813) but that he never formally described. Klug provided some morphological features that allow the identification of this species and the sex of the specimens he studied, resulting in its formal description. The species remained unnoticed during all these years, until a visit to the ZMB where I studied the specimens described by Klug, which had previously been recognized as such by another entomologist. The researcher designated one of the specimens as lectotype, but unfortunately, the nomenclatural act was never published. To formalize this action and avoid future taxonomic problems, this designation is published here, acknowledging the previous work carried out by him.