A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species Author Darby, Michael text European Journal of Taxonomy 2020 2020-04-02 622 1 188 journal article 22458 10.5852/ejt.2020.622 9cb3ea96-0ee4-40b4-8006-19b5fed80b46 3777282 9CD3B2CD-F072-4994-8CA9-24145D343401 Cissidium luctuosum sp. nov. urn:lsid:zoobank.org:act: 93ACA134-45EB-42F0-BE9E-CB51DAECDEBA Fig. 75 Etymology Johnson ms name. From the Latin adjective ‘ luctuosus ’, meaning ‘sorrowful’ or ‘mourning’ and presumably referring to the dark colour. Material examined Holotype PANAMA • ♀ ; N of Finca Palo Santo , nr Nueva California , Chiriqui Prov. ; 9 Mar. 1959 ; 4900 ft a.s.l. ; Berlese floor litter in damp ravine; H.S. Dybas leg.; FMNH . Fig. 75. Cissidium luctuosum sp. nov. A . Habitus. B . Pronotum, × 605. C . Mesoventrite showing median process of collar, mid-keel and keel, × 675. Description SIZE. Habitus ( Fig. 75A ), length 0.74 mm . COLOUR. Dark brown, pubescence, antennae, and legs dusky yellow. HEAD. With a linear depression behind the eyes, width across eyes 0.19 mm ; antennomeres III–XI length 0.33 mm , III–IX length 0.21 mm , X–XI length 0.12 mm ; mentum obscured. PRONOTUM. Length 0.19 mm , width 0.28 mm , pubescence confined mainly to margins, without either foveolae or foveae; sides evenly rounded to rectangular hind angles, bordered laterally, the border continuing along the posterior margin as far as the emargination opposite the scutellum ( Fig. 75B ). ELYTRA. Length 0.47 mm , width 0.38 mm , sparsely pubescent throughout. MESOVENTRITE. Median process of mesoventral collar parallel-sided, extending to mid-point of mid-keel; mid-keel almost parallel-sided, hind angles effaced before mesocoxal anterior borders, raised before joining keel; keel with ± four setae, narrow, almost parallel-sided, terminating in a point past the midpoint of the mesocoxae; mesoventral lateral margins effaced, barely visible; humeri sharply toothed ( Fig. 75C ). METAVENTRITE. Length 0.15 mm , sparsely setose, disc simple, width across spines 0.10 mm . WINGS. Macropterous. GENITALIA. Female spermatheca distinctive as Fig. 6E . Males not known. Remarks One of the five Panamanian species in this group. Distinguished by the disc of the pronotum lacking setae and by the setose posterior termination of the median extension of the mesoventral collar.