New Species and Records of Costa Rican Featherwing Beetles (Coleoptera: Ptiliidae) Author Darby, Michael text Zootaxa 2016 4184 1 41 51 journal article 10.11646/zootaxa.4184.1.2 6a80d4c8-9142-43f3-8e2f-ad72423fb244 1175-5326 164467 396B3FCE-089E-4661-A6D0-FE464D4AAA71 Nossidium issyae sp. n. ( Figs. 3 A–H ) Habitus Fig. 3 Aa/b. Length 0.96 mm . Body yellowish brown covered with grey/yellow overlapping pubescence, legs and antennae dusky yellow. Antennomeres 3–8 length 0.4 mm ; antennomeres 4–8 elongate, 10,11 globular, with sensillae. Width across eyes 0.38 mm . Mentum broadest at anterior margin tapering towards base, two longest setae situated medially on lateral margins, Fig. 3F . Pronotum length 0.33 mm , width 0.63 mm , posterior margin sinuate before the angles. Elytra length 0.56 mm , width 0.63 mm , widest just behind humeri. Wings of usual Nossidium type , Fig. 3H . Mesoventral collar reaching onto the humeri with a raised anterior border and a vertically oriented medial ridge, Fig. 3G ; mesoventral keel wide between the mesocoxae, Fig. 3D . Metaventrum short, pubescence denser on disc, posterior intercoxal process comprised of two short, sharp points, Fig. 3E . Male : not known. Female : spermatheca globular, Fig. 3C . FIGURE 3. A–H. Nossidium issyae sp. n. . Aa. habitus dorsal, Ab habitus ventral; B. front of head x400; C. spermatheca; D. metaventrum x 830; E. sharp points on posterior intercoxal process of metaventrum x 2120; F. mentum and submentum x 830; G. mesoventrum x320; H. wing. Etymology . Named after Miss Isobel 'Issy' Millett, a close friend of the author’s family. Diagnosis . The new species may be separated from N. schuelkei sp. n. and N. katyae by the form of the mesoventral keel which does not extend below the mesocoxae. In this respect it is similar to N. pilosellum , and the North American species N. americanum Motschulsky and N. amoenum Motschulsky but these are less rounded and more parallel sided species. Type data . Holotype : ♀ , Costa Rica , Alajuela , Peñas Blancas , 820m , 19 May 1989 , J. Ashe , R. Brooks , R. Leschen ; Snow Entomological Museum , Costa Rican Expedition,#279; ex. with ants under bark (MM). Fragments of a second specimen from the same locality, ex. Xylaria , 17 May 1989 , mounted as a slide, are also in MM.