The genus Coccidula Kugelann includes five species distributed in the Holarctic, with one species in North America and four in Palearctic region. Coccidula belongs to the tribe Coccidulini which historically was treated as a separate subfamily within ladybird beetles, but recent studies confirmed its placement as a tribe within the broadly defined subfamily Coccinellinae. All species are revised and a new synonymy of Lithophilus naviauxi Duverger with C. litophiloides Reitter is proposed. Light and electron microscopy pictures support morphological descriptions. An identification key to all species is also provided.

Species of the endemic New Zealand ladybird genus Adoxellus Weise, 1895 are revised. Male and female genitalia are illustrated for the first time, a key to species, images of larva and pupa and distribution map are provided. A lectotype for Scymnus flavihirtus Broun, 1880 and a neotype for Scymnus picinus Broun, 1880 are designated.

Three new Papuan species of the ladybird genus Rhyzobius Stephens, Rhyzobius albinos sp. nov., R. atramentarius sp. nov. and R. serratus sp. nov., are described, diagnosed and illustrated. An updated key to species of Rhyzobius from New Guinea is provided.

The herbivorous ladybird genus Merma Weise was regarded as an African endemite, however, recent examination of the type material of the two Malagasy species Epilachna hovana Sicard,1908 [now Merma hovana (Sicard,1908)] and Peralda quadriguttata Sicard, 1909 [now Merma quadriguttata (Sicard, 1909)], revealed they also belong to that genus. Here further three new species of Merma from Madagascar, M. ankarana sp. nov., M. antakotako sp. nov. and M. fisheri sp. nov., are described, diagnosed and illustrated. An updated key to species of Merma from Madagascar is also provided.