One step forward and two steps back: on three jumping spiders described by H. D. Badcock deposited in the Natural History Museum, London, and two species newly recorded for Argentina (Araneae: Salticidae) Author Sherwood, Danniella Author Nada, MarÍ ́ a Florencia Author Pet, Brogan L. text Peckhamia 2023 2023-06-04 298 1 1 9 journal article 10.5281/zenodo.8006064 1944-8120 8006064 8348154A-B3E6-4ECB-AAF1-78869BF49A4E Plexippus luteus Badcock, 1932 nomen dubium Plexippus luteus Badcock, 1932: 44 . (imm.) Plexippus luteus : Prośzynśki (2017) , 43. Type material. Holotype imm. ( BMNH 1932.9.2.74), Nanahua , Paraguayan Chaco , 01/03/1927 , coll. G. S. Carter examined. Remarks. The holotype of P. luteus is an immature ( Figs. 1–2 ) and this was recognised by Badcock (1932) . The World Spider Catalog (2023) mistakenly indicates that Badcock described this species as a male. Plexippus luteus is not able to be recognised based on the morphology of the specimen or from the original written description. Prośzynśki (2017) referred to this taxon as an "unrecognisable species," which is interpreted as a species inquirenda by the World Spider Catalog (2023) , although that term was not used explicitly by Prośzynśki (2017) . We agree that this species is unrecognisable, and that as a juvenile it may correspond to more than one species occurring at the type locality. We hereby formally propose P. luteus as a nomen dubium . Figures 1–2. Plexippus luteus Badcock, 1932 nomen dubium holotype immature (BMNH 1932.9.2.74). 1, Dorsal view. 2, Ventral view.