The immature stages of Eurypedus nigrosignatus (Boheman, 1854) and the first instar larva of Asteriza sp., members of the tribe Ischyrosonychini Chapuis, 1875, are described for the first time and compared with other Ischyrosonychini. Similarities in the larval morphologies of Cistudinella Champion, 1894, Eurypedus Gistel, 1834, Asteriza Chevrolat, 1836 and Physonota Boheman, 1854 suggest they have a close phylogenetic relationship and should be placed in a single tribe.

Immature stages of Cassida pfefferi Sekerka, 2006 from Cyprus are described and illustrated for the first time and compared with immatures of closely related species Cassida nobilis Linnaeus, 1758 and Cassida vittata Villers, 1789. Detailed descriptions of mature larvae and pupae of C. nobilis and C. vittata are also given. Analysis of the morphological body structure of the preimaginal stages of the studied species reveals subtle characters distinguishing C. pfefferi from other species of C. nobilis groups and confirms its species status.

Notosacantha timorensis sp. nov. belonging to the Notosacantha vicaria-group is described from Timor-Leste. Colour photos of N. sumbawaensis Świętojańska & Borowiec, 1999 and a key to the Notosacantha vicaria-group are given.

A new species Paraselenis (Spaethiechoma) convolvuli is described from Argentina (prov. Buenos Aires). The first detailed description of immature stages within the subgenus Spaethiechoma is given with some biological notes.

Immature stages of Cassida koreana Borowiec et Cho, 2011 are described in detail for the first time and compared with its closely related species, C. vespertina Boheman, 1862. Line drawings, chaetotaxy, live photographs, and SEM photos of morphological details are provided.

New Caledonian members of the tribe Cryptonychini are revised. The tribe is represented by eigth genera and 23 species, all but one endemic to New Caledonia. A new genera Paratorquispa gen. nov. and Wanatispa gen. nov. are proposed, and 11 species are described as new: Brontispa caledonica sp. nov., Caledonispa bivittata sp. nov., Caledonispa panieensis sp. nov., Caledonispa spinosa sp. nov., Isopedhispa costata sp. nov., Isopedhispa latemarginata sp. nov., Teretrispa daccordii sp. nov., Teretrispa longicollis sp. nov., Torquispa convexifrons sp. nov., Wanatispa cylindricollis sp. nov., and Wanatispa rutai sp. nov. Torquispa caledoniae Uhmann, 1954 is transferred to the genus Paratorquispa, comb. nov. Each taxon is provided with a detailed description, set of figures and studied material. Keys to all taxa are proposed.