572 Accepted by M. Schoeller: 21 Aug. 2017; published: 25 Sept. 2017 ZOOTAXA ISSN 1175-5326 (print edition) ISSN 1175-5334 (online edition) Copyright © 2017 Magnolia Press Zootaxa 4323 (4): 572–578 http://www.mapress.com/j/zt/ Article https://doi.org/10.11646/zootaxa.4323.4.9 http://zoobank.org/urn:lsid:zoobank.org:pub:13D63836-1022-47A1-BF67-26EAA3D5F18D Guilielmia Weise, a little known Afrotropical flea beetle genus: systematic affinities and description of a second new species from Central Africa (Coleoptera, Chrysomelidae, Galerucinae, Alticini) MAURIZIO BIONDI 1* & PAOLA D’ALESSANDRO 1 1 University of L’Aquila, Department of Life, Health and Environmental Sciences, Section of Environmental Sciences—Via Vetoio 12, 67100 L’Aquila, Italy. E-mail: maurizio.biondi@univaq.it, paola.dalessandro@univaq.it * Corresponding author Abstract The genus Guilielmia Weise from the high mountains of Central Africa, known on a female specimen only, is redescribed based on new specimens of the type species, and the new species Guilielmia leleupi sp. nov. described here. Habitus pho- tos, and microscope and scanning electron micrographs of diagnostic characters, including the aedeagus, are provided for both the species. Some considerations about taxonomic affinities and morphological adaptations to high altitudes are sug- gested. Key words: Afrotropical region; Aphthona; high altitude insects; new species Introduction Alticini is a tribe of Coleoptera, Chrysomelidae comprising generally small species able to jump at the adult stage, from which the name ‘flea beetles’ is derived. It includes over 6000 described species, grouped in approximately 630 genera (Insektoid.Info 2017; Nadein 2013; Nadein & Beždek 2014), and occurring almost all over the world. Some genera are widespread in more than one zoogeographical region (i.e. Altica Geoffroy, Aphthona Chevrolat, Chaetocnema Stephens, Longitarsus Berthold, etc.) while others are strictly endemic to very limited areas, often in high mountain refugia, that are typical areas of microendemism, both at species and at genus level (for the Afrotropical region see Biondi & D’Alessandro 2003). The sub-Saharan Africa hosts 84 different flea beetle genera of which about 64% are endemic (Biondi & D’Alessandro 2010, 2012; Biondi et al. 2017). Among them, Guilielmia Weise, 1924 shows a very limited distribution. It was only known by the original description, based on a single and immature female, from a mountain area (Birunga, Volcan Mikeno and Volcan Karisimbi) between Uganda, Rwanda and Democratic Republic of the Congo (Kivu-Sud) (Biondi & D’Alessandro 2012: 86, Figs 46, 318). It must be a rare genus, because we found only three more specimens in the main European and extra-European collections of Afrotropical beetles, two of which belong to a species new to science. In this contribution, we supply an updated description of the genus Guilielmia Weise based on new material, including the characters of the male and the metafemoral extensor tendon, and the description of a second species new to science from high elevations of Kivu Province (Democratic Republic of the Congo). Materials and methods Material examined consisted of dried pinned specimens preserved in the institutions listed below. Specimens were examined, measured and dissected using a Leica M205C binocular microscope. Photomicrographs were taken using a Leica DFC500 camera and the Zerene Stacker software version 1.04. Scanning electron micrographs were