New synonyms in western Palaearctic Ciidae (Coleoptera).

Based on the study of type specimens, the following new synonyms in western Palaearctic Ciidae are proposed: Cis glabratus Melli, 1849 = C. bituberculosus Roubal, 1937 (syn. nov.) = C. bituberculatus Roubal, 1912 (syn. nov.); Cis micans (Fabricius, 1792) = C. crenatus C. R. Sahlberg, 1836 (syn. nov.); Cis rugulosus Melli, 1849 = C. puncticollis Thomson, 1870 (syn. nov.) = C. thomsoni Dalla Torre, 1911 (syn. nov.); Cis vestitus Melli, 1849 = C. incanus Rey, 1892 (syn. nov.); and Ennearthron cornutum (Gyllenhal, 1827) = E. ondreji Roubal, 1919 (syn. nov.). The lectotypes are designated for Cis bituberculatus Roubal, 1912; C. crenatus C. R. Sahlberg, 1836; C. hispidus var. albohispidulus Reitter, 1901; C. puncticollis Thomson, 1870; and Cis incanus Rey, 1892.

The first extinct species of Monolepta Chevrolat (Coleoptera: Chrysomelidae: Galerucinae) from Bitterfeld amber, described using X-ray micro-computed tomography.

Based on a well preserved female specimen from Bitterfeld amber, Monolepta rappsilberi sp. nov. is described and illustrated using X-ray micro-computed tomography (CT). It is the second reported member of Chrysomelidae from this fossil resin and the first described fossil Monolepta representative. The fossil species represents a lineage that is extinct in Recent Europe. A longitudinal carina on abdominal ventrite 5 of the female is a unique character for the subfamily Galerucinae.