Acrotrichis belli sp. nov. urn:lsid:zoobank.org:act: E6F809AC-FF7D-4180-9964-6F47AE3001C8 Fig. 15 Diagnosis The flattened hind angles of the pronotum together with the form of the genitalia distinguish this species. Etymology Named after Mark Bell, the engineer who services my SEM. Type material Holotype MALAYSIA-BORNEO • ♀; Sarawak, 4 th Division, Gunung Mulu National Park; 500–800 m a.s.l.; Mar.–May 1978; I. Hanski leg., BM 1978-524; pitfall trap fish bait MD forest slope 17-21, in alluvial forest; BMNH. Paratypes MALAYSIA-BORNEO • 1 ♂, 1 ♀ (the ♀ mounted disarticulated on the slide); same data as for holotype; BMNH. Description SIZE. Habitus (Fig. 15A), length 0.60 mm. COLOUR. Dark brown, antennae and legs yellow, dorsal surface shallowly foveolate, densely covered with fine yellow pubescence. HEAD. Distance across eyes 0.27 mm; antennomeres III–XI, length 0.26 mm; mentum lateral margins rounded towards apex; submentum with two long setae (Fig. 15H). PRONOTUM. Length 0.20 mm, width 0.40 mm, hind angles noticeably broad and flat (Fig. 15B). ELYTRA. Length 0.39 mm, width 0.40 mm. VENTRUM. Mesoventrum reticulate, without pubescence, posterior margin of collar almost straight before meeting lateral margins of mesoventrum, keel obliterated anteriorly before collar, extending posteriorly to a sharp point between the mesocoxae (Fig. 15F). Metaventrum reticulate with scattered pubescence particularly in anterior half, posterior margin between metacoxae with two sharp points at corners, metacoxae separated by ± ¹∕₅ the width of the sclerite (Fig. 15F). FEMALE GENITALIA. Spermatheca (Fig. 15D). MALE GENITALIA. Aedeagus (Fig. 15E).

Published as part of Darby, Michael, 2019, New Ptiliidae (Coleoptera) from Sarawak in the spirit collection of the Natural History Museum, London, pp. 1-50 in European Journal of Taxonomy 512 on pages 32-34, DOI: 10.5852/ejt.2019.512, http://zenodo.org/record/2628794