ABSTRACT Among the predatory ladybird beetles (Coccinellidae: Coleoptera), members of the Coccinellini, predators of aphids and psyllids, stand out. Although the beneficial status of these beetles has been acknowledged by biological control researchers, there are no keys or detailed studies on the immature stages of South American Coccinellidae, especially Coccinellini. We provide descriptions and illustrations of the immatures and adults of major predatory Coccinellini species in southern Brazil along with an identification key for fourth instar larvae and pupae. The following species are included: Cycloneda sanguinea (Linnaeus, 1763), Eriopis connexa (Germar, 1824), Harmonia axyridis (Pallas, 1773), Hippodamia convergens Guérin-Méneville, 1842 and Olla v-nigrum (Mulsant, 1866). The morphological study, which included the use of scanning electron microscopy, revealed new characters such as the type of tarsal claws, spiracles, chalazae, parascoli and strumae. The identification key provided here may be useful in biological control programs.

RESUMO As espécies de Histeridae são quase que exclusivamente predadoras e podem ser encontradas em uma grande diversidade de ambientes. Dentre os grupos associados a carcaças, alguns são citados como relevantes na entomologia forense médico-legal. Entretanto, há pouca informação taxonômica para a família, principalmente na Região Neotropical. Desta forma, os objetivos do trabalho foram elaborar uma chave de identificação e caracterizar as espécies de Histeridae de interesse médico-legal no Brasil. Além disso, são apresentadas informações de distribuição geográfica e aspectos biológicos das espécies. As seguintes espécies são registradas como relevantes na entomologia forense no Brasil: Aeletes nicolasi Leivas, 2012; Euspilotus azureus (Sahlberg, 1823); Hister cavifronsMarseul, 1854; Omalodes bifoveolatus Marseul, 1853;Omalodes foveola Erichson, 1834; Omalodes lucidus Erichson, 1834, Operclipygus subterraneusCaterino & Tishechkin, 2013; Phelister sanguinipennisMarseul, 1853; e Scapomegas auritus Marseul, 1855. Esta contribuição representa a primeira ferramenta para uma melhor identificação dos Histeridae associados a carcaças no Brasil e pode servir como referência e aplicação na entomologia médico-legal.

ABSTRACT The histerid species are mostly predator and can be found in different environments. Among the groups associated with carcasses, some are reported as relevant in medicolegal entomology. However, the Histeridae taxonomic data is poorly known, especially in the Neotropics. The aim were to elaborate an identification key and provide diagnosis of the Histeridae species with forensic interest from Brazil. Also, the distribution and biological data of the species were added. The following species are recorded in Brazil as important for forensic entomology: Aeletes nicolasi Leivas, 2012;Euspilotus azureus (Sahlberg, 1823); Hister cavifrons Marseul, 1854; Omalodes bifoveolatusMarseul, 1853; Omalodes foveola Erichson, 1834;Omalodes lucidus Erichson, 1834, Operclipygus subterraneus Caterino & Tishechkin, 2013; Phelister sanguinipennis Marseul, 1853; and Scapomegas auritus Marseul, 1855. This is the first work for forensic studies with Histeridae from Brazil and it can be used at applied forensic entomology.