Jpn. J. syst. Ent., 15(1): 57–77. June 30, 2009 Species of Mystropini (Coleoptera, Nitidulidae) Associated with Inflorescence of Palm Ceroxylon quindiuense (KARST.) H. WENDL. (Arecaceae) from Peru G. Alexander KIREJTSHUK Zoological Institute of the Russian Academy of Sciences, Universitetskaya emb. 1, St. Petersburg, 199034, Russia E-mail: kirejtshuk@gmail.com; agk@zin.ru and Guy COUTURIER Institut de recherche pour le développement and Museum national d’Histoire naturelle, Entomologie, case 50, 57 rue Cuvier, 75231 Paris Cedex 05 France E-mail: couturie@mnhn.fr Abstract The paper presents an overview of species of the genus Mystrops MURRAY, 1864 collected on male inflorescence of the palm Ceroxylon quindiuense (KARST.) H. WENDL. (Arecaceae) in the Andes of Peru. They are Mystrops delgadoi sp. nov., M. hisamatsui sp. nov., M. neli sp. nov., M. pulchra sp. nov. and M. rotundula SHARP, 1889. Besides, M. gigas sp. nov., which is closely related to M. hisamatsui sp. nov. and M. neli sp. nov. and probably also associated with the same host plant, is also described from Ecuador. Introduction Family Nitidulidae of South America as many other insect groups still remain poorly studied. The rather important pollinators of palms from the tribe Mystropini have long been unnamed, as well as the species of Mystropini associated with cultivated plant species. The authors recently prepared a paper in which this gap in our knowledge is partly closed (KIREJTSHUK and COUTURIER, in press). This paper somehow presents a continuation of the latter paper, although it deals mostly with the species of Mystropini obtained from male inflorescence of one palm species of economic importance studied in the Andes of Peru. In many species of Neotropical palms, inflorescences attract a high number of different insects (HENDERSON, 1986). However, among them the most part is represented by beetles from the families Curculionidae and Nitidulidae. Once floral bractlets are opened (usually at the end of the afternoon), anthesis begins and thousands of adult insects are attracted by flower smell. The composition of species and groups of weevils and sap beetles varies in accordance with genus and species of palms. The insects have been collected in an inflorescence of the palm Ceroxylon quindiuense (KARST.) H. WENDL. (Arecaceae). Nitidulidae of the inflorescences of C. quindiuense have never been studied before. As a result, the authors have found five species, four of which are actually undescribed. Besides, the description of one additional new species is added to the paper, because it seems to be a close relative to two newly described species from Ceroxylon quindiuense. Palms of the genus Ceroxylon BONPL. are distributed along the Andes from Venezuela to Bolivia (GALEANO et al., 2008; HENDERSON et al., 1995) and grow between