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The genus Mesostrix Mazur, 1994 was erected to include a single species, M. pentatoma Mazur, 1994. It was originally placed within the tribe Platysomatini (Mazur, 1994: 46) as occupying an intermediate position between Eblisia and Platysoma. Subsequently, Ôhara & Mazur (2002: 20; Figs. 10A–F, 11A–F) redescribed the genus, providing additional characters separating the genus from other members of the tribe and giving a detailed description and figures of external and internal morphology of the type species, M. pentatoma. Most recently Mazur & Ôhara, 2009: 247) placed Mesostrix in the “Platysoma-section” of the tribe Platysomatini, having a longitudinal carina on the mesocoxa such as that found in the genera of this section. Among these genera the outwardly projected anterior pronotal margin and the presence of two metaventral depressions are also distinctive for the genus.

Faunistic review of Polish Platypodinae and Scolytinae (Coleoptera: Curculionidae)Based on a survey of the literature and collections, the distributions of the Platypodinae and Scolytinae (Curculionidae) within the present-day borders of Poland are summarized. An updated and annotated checklist is given of Polish pinhole borers (1 genus, 1 species) and bark beetles (35 genera, 110 species).Carphoborus cholodkovskyiSpessivtsev has been removed from the list; the presence ofHylastinus obscurus(Marsham),Pteleobius kraatzii(Eichhoff),Pityophthorus exsculptus(Ratzeburg),Cryphalus saltuariusWeise,Thamnurgus kaltenbachii(Bach),T. varipesEichhoff,Pityogenes irkutensis monacensisFuchs,P. saalasiEggers,Xyleborus eurygraphus(Ratzeburg) andX. pfeilii(Ratzeburg), reported by previous authors, needs to be confirmed by new findings.Pitophthorus carniolicusWichmann,Xylosandrus germanus(Blandford) andCrypturgus subcribrosusEggers were recorded generally from Poland.Hylastes plumbeusBlandford,Phloeosinus aubei(Perris),Gnathotrichus materiarius(Fitch),Orthotomicus erosus(Wollaston),Scolytus sulcifronsRey andTrypodendron laeveEggers (Knížek 2011) were erroneously recorded from Poland.

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