A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species Darby, Michael European Journal of Taxonomy 2020 2020-04-02 622 1 188 8XXQ8 Darby, 2020 Darby 2020 [626,863,1513,1540] Insecta Ptiliidae Cissidium GBIF,CoL Animalia Coleoptera 40 41 Arthropoda species houailou sp. nov.   Fig. 26    Etymology Johnson ms name, after Houailou, a commune in the North Province of New Caledoniawhere the insect was found. Noun in apposition.    Material examined    Holotype NEW CALEDONIA• ♀; Col de Hou b. Houailou; 1970; H. Franzleg.; MM holotype; MMUE.    Paratype NEW CALEDONIA• ♀, same collection data as for holotype; MMUE.    Description SIZE. Habitus ( Fig. 26A) length 0.66 mm. COLOUR. Dark brown, shining, pubescence, antennae and legs paler. HEAD. With a shallow linear depression interrupted medially by a small foveola behind the eyes, width across eyes 0.22 mm; antennomeres III–XI length 0.37 mm, III–IX length 0.22 mm, X–XI length 0.15 mm; mentum and prementum obscured. PRONOTUM. Length 0.18 mm, width 0.28 mm, pubescence mainly confined to lateral margins one or two scattered setae on disc, with a row of six shallow foveae along the posterior margin; sides rounded then almost parallel to slightly acute hind angles, border on lateral margins not continued along the posterior margin which has a sinuous emargination opposite the scutellum ( Fig. 26B). ELYTRA. Length 0.44 mm, width 0.37 mm, pubescent, foveolate throughout contrasting with the pronotum. MESOVENTRITE. Collar with a long, pointed medial extension almost reaching to posterior margin of the mid-keel; mid-keel parallel-sided, anterior corners rounded before reaching collar, posterior corners almost reaching mesocoxae, sharply raised at junction with keel; keel with ± three setae, parallel-sided to rounded termination close to base of mesocoxae; mesoventral lateral margins with one or two serrations in posterior half; humeri bluntly toothed ( Fig. 26C). METAVENTRITE. Length 0.14 mm, almost glabrous, one or two scattered setae only, disc plain, width across spines 0.12 mm, spines short; posterior margins of mesocoxae without serrations. WINGS. Macropterous.   Fig. 26.  Cissidium houailou sp. nov. A. Habitus. B. Pronotum, × 585. C. Mesoventrite showing median process of collar, mid-keel and keel, × 580. GENITALIA. Female spermatheca globular. Males not known.    Remarks See remarks for  C. amieuense sp. nov.  Cissidium houailou sp. nov.differs from that species in having a parallel sided mid-keel. 2609493677 MMUE H. Franz New Caledonia Col de Hou b. Houailou 40 41 1 1 holotype 2609493642 MMUE H. Franz New Caledonia 40 41 1 1 paratype