The 224 types of species of Tenebrionidae and Perimylopidae (Coleoptera) housed in the collection of the Entomology Department of Museo de La Plata up until December 2008 were examined and listed; 96 names are recorded, 39 of them (41 percent) are represented by name bearing types (“primary” types). These 224 types belong to 85 species and 9 subespecies of Tenebrionidae assigned to the following subfamilies: Diaperinae (3 species, 3 types), Lagriinae (4 species, 9 types), Pimeliinae (53 species, 1 subspecies, 128 types), Stenochiinae (7 species, 10 types) and Tenebrioninae (18 species, 8 subspecies, 72 types), and 2 types belonging to 2 species of Perimylopidae. Species and subespecies herein treated were described by Berg (23), Burmeister (1), Bruch (1), Fairmaire (8), Flores & Carrara (1), Flores & Roig-Juñent (1), Flores & Vidal (2), Freude (2), Kulzer (27), Molinari (7), Müller (2), Peña (14), Peña & Barría (2), Pic (3), Steinheil (1) and Viana (1). Complete information is given for each type, including reference to original description, and label data. Two lists were added in order to support future research: one for specimens labelled as types but not found in the bibliography and seemingly not published and another for specimens labelled as types but not included in the original series.