A new Neotropical genus Rideriana gen. nov. is proposed to include R. amazonica sp. nov., from Cuzco (Peru), Acre (Brazil) and La Paz (Bolivia).

Revision of the genus Paramecocephala Benvegnú, 1968 (Heteroptera, Pentatomidae). The Neotropical genus Paramecocephala Benvegnú, 1968 is revised based on morphological characters, particularly of the genitalia of both sexes. Formerly monobasic with P. foveata Benvegnú, 1968, type species, the genus received two species recently transferred from Mecocephala Dallas, 1851: M. fusca Haglund, 1868 and M. uruguayensis Pirán, 1970. Five new species are herein described: P. australis Frey-da-Silva & Grazia sp. nov., P. bachmanni Frey-da-Silva & Grazia sp. nov., P. bergrothi Frey-da-Silva & Grazia sp. nov., P. guianensis Frey-da-Silva & Grazia sp. nov. and P. subsolana Frey-da-Silva & Grazia sp. nov. Illustrations of the genitalia, a key to the species and a distribution map are provided.

Four new species of Acrosternum from Brazil are described: Acrosternum (Chinavia)immaculatum(Pará, Mato Grosso, Minas Gerais), A.(C.) panizzii (Paraná), A. (C.) pontagrossensis(Paraná)and A. (C.) rideri (Amazonas, Mato Grosso, Goiás, Distrito Federal, Minas Gerais). The external and internal genitalia of both sexes, except of A. (C.) pontagrossensis are studied. A key for the identification of all known species of the genus is included.

Neste trabalho é apresentada a descrição dos caracteres morfológicos externos do ovo e dos ínstares ninfais de Loxa deducta Walker e Pallantia macunaima Grazia, alimentando-se de frutos de Ligustrum lucidum Ait. Os ovos e os cinco ínstares ninfais são ilustrados.

In this paper the description of the immature stages of Loxa deducta Walker and Pallantia macunaima Grazia (Heteroptera: Pentatomidae) fed on privet, Ligustrum lucidum Ait. are offered as an aid to their taxonomic identification. The eggs and all five instars are illustrated.