We describe and illustrate six new species of the family Cantharidae from Baltic amber: Sucinorhagonycha maryae sp. nov. (Cantharinae, Cacomorphocerini), Podistra madelineae sp. nov. (Cantharinae, Cantharini), Malthinus (Malthinus) karenpankowskiae sp. nov. (Malthininae, Malthinini), Malthinus (Malthinus) pauljohnsoni sp. nov. (Malthininae, Malthinini), Malthodes (Libertimalthodes) betseyae sp. nov. (Malthininae, Malthodini) and Malthodes (Malthodes) greenwalti sp. nov. (Malthininae, Malthodini). These new taxa add to the astonishing palaeodiversity documented in Baltic amber, demonstrating the wide range of organisms thriving in European forests and wooded areas during the Eocene. Extant species of Malthodes, Malthinus and Podistra also provide important clues to how these extinct taxa lived, fed and reproduced some 35–40 million years ago.

A new fossil species of the family Cantharidae from Eocene Baltic amber, Silis (Silis) boninoi sp. nov., is described, diagnosed and illustrated. The new species is characterized by its extremely small body size along with a very wide and transverse pronotum with two short and quite robust lobes on each side. It is compared with other known taxa of the genus Silis from Baltic, Dominican and Mexican ambers.

A new species of firefly, Afrodiaphanes pulcher sp. nov., is described, diagnosed and illustrated. This is the first species of Afrodiaphanes described from the Central African Republic as well as the first firefly described from this nation.

Two new Heteromastix Boheman, 1858 from Mount Arfak in New Guinea (Indonesia, West Papua) are described. Heteromastix casadioi sp. nov. is characterized by 12 antennomeres, a feature only known in one other species until now. Heteromastix colacurcioi sp. nov. is similar to H. elongatus Wittmer, 1959 but differs in the antennomeres X-XI. Furthermore, a redefinition of the species groups of the entire genus Heteromastix is provided.