Acrotrichis corpulenta sp. n. (Figs. 5A –I) Habitus Fig 5A. Length 0.85 mm. Colour yellowish brown, antennae and legs lighter. Antennomeres 3–11 0.31 mm long Fig. 5 C. Mentum and submentum chaetotaxy Fig. 5 F. Width across eyes 0.30 mm. Pronotum 0.47 mm wide, 0.22 mm long, sides with a slight insinuation before the hind angle when viewed at 45° Fig. 5 B. Elytra 0.52 mm long, 0.47 mm wide. Mesoventrum Fig. 5 G. Posterior margin of metaventrum and metacoxal plates Fig. 5 H. Pygidium, Fig. 5 J, with setae on the anterior margin and lacking long setae as Fig. 2 F. Male: aedeagus Fig. 5 D; ventrites 6, 7 Fig. 5 I. Female: spermatheca Fig. 5 E. Etymology. From the Latin corpulentus meaning thick or stout and referring to the overall appearance. Diagnosis. The brownish yellow colour and stout appearance together with the characters of the male ventrite 6 will distinguish this species. Type data: Holotype: ♂, GPS27, BOL / Nov.2013/06., Bolivia, 24.xi.2013, Cochabamba dep., Cristal Mayu river valley ca 20 km E. of Villa Tunari, sifting litter, ca 720m, Winkler app. extr., P.Baňař lgt. (UASC). Paratypes: 4♂ 1♀, GPS31, BOL / Nov 2013/08, Bolivia 2013, Santa Cruz dep., W. Amboro NP, Siberia Pass env., 2481m, 28.xi, S. 17°50'25" E.64°41'58", sifting litter, Winkler app. extr., P.Baňař lgt. (UASC / MMBC, BMNH); 1♂, GPS30, BOL / Nov 2013/7, Bolivia 2013, Santa Cruz dep., W. Amboro NP, Siberia Pass env., 2508m, 28.xi, S. 17°50'27" E.64°41'59", sifting litter, Winkler app. extr., P.Baňař lgt. (BMNH); 1♂, GPS32, BOL / Nov 2013/09, Bolivia 2013, Santa Cruz dep., W. Amboro NP, Siberia Pass env., 2450m, 28.xi, S. 17°50'12" E.64°42'08", sifting litter, Winkler app. extr., P.Baňař lgt. (UASC / MMBC).

Published as part of Darby, Michael, 2015, Studies of Bolivian Ptiliidae (Coleoptera) 2: The subfamily Acrotrichinae including two new genera Petrotrichis and Microtrichis, and eight new species of Acrotrichis, pp. 190-210 in Zootaxa 3999 (2) on pages 196-197, DOI: 10.11646/zootaxa.3999.2.2, http://zenodo.org/record/241696