Cissidium tigrum sp. n. Figures 6, 10, 17, 25, 27, 34, 43a–b Habitus Fig. 6, 0.63 mm long. Colour light brown, antennae and legs dusky yellow. Antennomeres 3–11 0.38mm long, Fig. 25. Distance across eyes 0.21 mm. Mentum Fig. 27. Pronotum 0.25 mm wide, 0.16 long, Fig. 17. Elytra 0.39 mm long, 0.32 mm wide, area around scutellum less closely punctureC. Mesoventrum Fig. 10, collar extending posteriorly to meet mesocoxal process which is hooked in horizontal view and parallel between the mesocoxae with a rounded posterior termination. Lateral points of metaventral margin between metacoxae small. Aedeagus Figs 43a–b. Females unknown. Etymology. Named after the species somewhat pugnacious appearance. Diagnosis. The remarkable form of the antennae, unparalleled in the family, coupled with the species small size will quickly distinguish it from all others. Type material Holotype: ♂, GPS 26, BOL / Nov 2013/05, BOLIVIA, 24.xi.2013, COCHABAMBA dep., Cristal Mayu River valley ca 20km W of Villa Tunari, S. 17°00'55" E. 65°37'48", sifting litter, 550m, Winkler app. extr., P. Baňař lgt.. (UASC). Paratype: ♂, same data as holotype (MMBC). FIGURES 41–43. Cissidium aedeagi. 41a–b. C. petri sp. n.. 42a–b. C. amboroensis sp. n.. 43a–b. C. tigrum sp. n..

Published as part of Darby, Michael, 2015, Studies of Bolivian Ptiliidae (Coleoptera) 1: The genus Cissidium Motschulsky with six new species, pp. 179-190 in Zootaxa 3937 (1) on pages 186-189, DOI: 10.11646/zootaxa.3937.1.9, http://zenodo.org/record/235062