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 davaoense sp. nov. urn:lsid:zoobank.org:act: A184CD9F-CE94-4F39-A310-9DF4DBE068B9 Fig. 21 Etymology Named after the region in the Philippines where the specimen was found. Material examined Holotype PHILIPPINES • ♂ ; Davao , Mindanao, E. slope of Mt McKinley ; 3500 ft a.s.l. ; 15 Aug. 1946 ; flight dusk ; F.G.Werner leg.; FM(HD) 46.10; FMNH . Description SIZE. Habitus ( Fig. 21A ), length 0.54 mm . COLOUR. Dusky yellow. HEAD. With a shallow median depression between the eyes, width across eyes 0.18 mm ; antennomeres III–XI length 0.25 mm , III–IX 0.14 mm , X–XI length 0.11 mm ; mentum as Fig. 4A. Fig. 21. Cissidium davaoense sp. nov. A . Habitus. B . Pronotum, × 870. C . Mesoventrite showing median process of collar, mid-keel and keel, × 1000. PRONOTUM. Length 0.14 mm , width 0.21 mm , sparsely pubescent, with a row of ± nine foveae along the posterior margin, and ± three shallow foveae anterior to these; lateral margins bordered, rounded then almost straight to slightly obtuse hind angles, border not extending onto the posterior margin which has a sinuous emargination before the scutellum ( Fig. 21B ). ELYTRA. Length 0.36 mm , width 0.27 mm , pubescent, foveolate in basal third. MESOVENTRITE. Medial extension of collar onto mid-keel narrow, anterior margin with two semi-circular emarginations, posterior corners joining mesocoxae; mid-keel sharply raised medially before keel; keel with two setae, sharply pointed to termination almost reaching posterior margin of the mesocoxae; mesoventral lateral margins coarsely serrate in posterior half; humeri with small tooth ( Fig. 21C ). METAVENTRITE. Length 0.12 mm , width across short triangular spines 0.06 mm ; posterior margins of mesocoxal cavities serrate. WINGS. Macropterous. GENITALIA. Male aedeagus as Fig. 6 Fa–b. Females not known. Remarks One of the only two species of Cissidium in this group from the Philippines . Distinguished by the smaller pronotal foveae than those on C. advena sp. nov.