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 bilineatum sp. nov. urn:lsid:zoobank.org:act: E3934680-B3BE-4C64-87A4-FE0BEEF8896F Figs 3H , 6A , 66 Etymology Named after the linear depressions on the pronotum Material examined Holotype MALAYSIA • ♂ ; E Johore Sedili, Jason’s Bay , coastal swamp forest; 13 Oct. 1963 , very wet litter ; D.H. Murphy leg.; No 82; FM(HD) # 50.34; FMNH . Paratypes MALAYSIA • 1 ♂ , 2 ♀♀ ; same collection data as for holotype; 1 ♀ mounted verso; MMUE , BMNH . Additional material MALAYSIA • 1 ♂ ; Sabah , Sandakan Distr. , Sapagaya Forest Res.; 27 Jul. 1980 ; logged dipterocarp forest ; R.F. Inger and D.D. Davis leg.; lacking antennae and with one elytron re-attached; MMUE . This specimen, not listed as a paratype , may be this species. It is much darker than the type series but in all Fig. 66. Cissidium bilineatum sp. nov. A . Habitus. B . Pronotum, × 395. C . Mesoventrite showing median process of collar, mid-keel and keel, × 1140. other respects similar, particularly in having a very setose head and patches on the mesoventral collar without reticulation. Description SIZE. Habitus ( Fig. 66A ), length 0.68 mm . COLOUR. Yellow brown, pubescence, legs and antennae slightly paler HEAD. Densely setose and foveolate ( Fig. 3H ); width across eyes 0.21 mm ; antennomeres III–XI length 0.33 mm , III–IX length 0.21 mm , X–XI length 0.12 mm globular; mentum as Fig. 4A. PRONOTUM. Length 0.21 mm , width 0.31 mm , pubescence more outstanding than on elytra, with two linear depressions reaching almost to the midpoint of the sclerite; side margins ± sharply angled then sinuate to obtuse hind angles, bordered, the border extending along the entire posterior margin including the emargination opposite the scutellum ( Fig. 66B ). ELYTRA. Length 0.44 mm , width 0.40 mm , more densely pubescent than pronotum, pubescence slightly shorter. MESOVENTRITE. Medial extension of collar narrow either side of semi-circular impressions in collar then widening posteriorly; mid-keel posterior corners not reaching anterior margin of mesocoxal borders; keel with a series of ± nine setae, almost parallel to a rounded tip between the mesocoxae; mesoventral lateral margins serrate in posterior half; humeri strongly toothed ( Fig. 66C ). METAVENTRITE. Length 0.16 mm , width across spines 0.10 mm , with scattered setae, disc plain; posterior margins of mesocoxal cavities serrate. WINGS. Macropterous. GENITALIA. Male aedeagus as Fig. 6 Fa–b. Female spermatheca ( Fig. 6A ). Remarks Distinguished from C. visendum sp. nov. , the only other Cissidium recorded from Malaya in this group, by the presence of the linear depressions on the pronotum.