Over the last 50 years, the genus Aganacris has undergone several taxonomic changes. In this study, an infrared spectrum analysis as a complementary and alternative analysis method was carried out for 112 Aganacris specimens belonging to five species. Significant differences were observed between males and females of the species, thus taking into account a new taxonomic status for the genus and the revalidation of Aganacris sphex (Rehn) stat. rev. The ability of Near Infrared Reflectance Spectroscopy (NIRS) to reproduce phenotypic (intra and interspecific) patterns in Aganacris populations was also verified. This method was applied, for the first time, as a taxonomic tool in the definition of individual sexual association and for the resolution of a taxonomic problem concerning Orthoptera, Tettigoniidae.

Abstract. This paper reports a new record of Quiva diaphana Hebard and Quiva pulchella Rehn to Brazil along with the occurrence of Quiva abacata (Brunner von Wattenwyl) for the first time in the Brazilian Amazon, including distribution notes.

A regional study is performed for the Amazonian species of the genus Microcentrum Scudder, 1862, its proposed Microcentrum punctifrons Brunner von Wattenwyl, 1891 as nomen dubium n. stat. and two new species are described: Microcentrum amacayacu Cadena-Casteñada, Sovano n. sp. and Microcentrum xavieri Sovano, Cadena-Casteñada n. sp. the Colombian and Brazilian Amazon, respectively. A list and a key to the Amazonian species are also provided, along with a discussion on their distribution, according to endemism areas established to Amazon rainforest.

Two new species of the genus Quiva: Quiva buhrnheimi n. sp. and Quiva gutjahrae n. sp. from Brazilian Amazon are described. Determinations for distributional data previously published by Sovano & Mendes (2013) are clarified and the synonymy of Ituana dorisae under Q. abacata is confirmed. In this paper, an updated key to subgenus Quiva is provided.

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