Revision of Atopida White, 1846 (Coleoptera: Scirtoidea: Scirtidae).

Atopida is a New Zealand endemic genus distributed in both North and South Islands. Remarkable sexual dimorphism of most species was a source of numerous misinterpretations in studies by Thomas Brounmales and females of the same species were often described as distinct taxa. After examining type material of all species and over 600 additional unidentified specimens from several institutions, the following new synonyms were established: Atopida grahami Broun, 1910 is a junior synonym of A. hirta Broun, 1880; A. pallidula Broun, 1921 is a junior synonym of A. impressa Broun, 1914; A. basalis Broun, 1912 and A. sinuata Broun, 1893 are junior synonyms of A. proba Sharp, 1878; A. lawsoni Sharp, 1878 is a junior synonym of A. suturalis (White, 1846). The following eight species are newly described: Atopida insularis sp. nov., A. lescheni sp. nov., A. paparoa sp. nov., A. paringa sp. nov., A. tuhua sp. nov., A. waipoua sp. nov., A. walkerae sp. nov., and A. westlandensis sp. nov.

Calvariomorphusa new genus of marsh beetles (Coleoptera: Scirtidae) with remarkable elytral excitators.

A new genus of marsh beetles (Coleoptera: Scirtidae: Scirtinae) from Southeast Asia is described to accommodate Contacyphon peterseni (Klausnitzer, 1973) from Bismarck Archipelago and three newly described species: Calvariomorphus malayanus sp. nov. (type species of the genus), C. sakaii sp. nov., and C. palauensis sp. nov. Morphology and relationships between Calvarium-like taxa, defined on the basis of several common morphological features (compact body, very narrow clypeus, deep subantennal fossae) are discussed.

Three new genera of large marsh beetles (Coleoptera: Scirtidae) from Valdivian temperate rain forests of southern South America.

The present paper fills a gap in the knowledge of the largest marsh beetles in the Neotropics. Argelodes gen. nov., Solierodes gen. nov. and Mucronotus gen. nov. are described from Southern South America. Argelodes and Solierodes are monotypic, contain Argelodes magnificus sp. nov. and Solierodes rousseli (Solier, 1849) comb. nov., while Mucronotus contains five species: Mucronotus velutinus (Solier, 1849) comb. nov., M. schwabei (Pic, 1938) comb. nov., and three newly described onesM. enigmaticus sp. nov., M. patagonicus sp. nov., and M. valdivianus sp. nov. Affinities of newly described genera with Australian taxa are briefly discussed. Pronotal modifications in marsh beetles are illustrated and discussed.