-Cornops aquaticum (Bruner) has Eichhornia crassipes, E. azurea, Pontederia cordata and P. lanceolata (Pontederiaceae) as the known host plants. This grasshopper species is cited as a possible agent of biological control for native aquatic macrophytes E. azurea and E. crassipes. This study, carried out from March, 2006 to February, 2007, aimed to evaluate the phenology and age structure of the population of C. aquaticum associated with E. azurea in Piuval bay, Pantanal of Poconé, MT, and to identify possible relationships of its life cycle to abiotic factors such as insolation, temperature and precipitation. Monthly collections of 50 individuals were carried out according to the protocol defi ned by the "Host -Insect Coevolution on Waterhyacinth" project. Adults and nymphs were separated and the females dissected in order to evaluate ovary maturation. The population presented adults and nymphs during the whole year, suggesting the occurrence of more than one reproductive period. The nymphs from the fi rst stage predominated in August 2006 and the adults in September and October 2006, synchronized with the dry period and beginning of the fl ooding period, respectively. The highest relative abundance of the females with mature ovaries occurred in July 2006 (50%), indicating that this may be a more propitious period for reproduction. The data suggest that C. aquaticum is a species in continual reproduction in Piuval bay and its cycle is associated with the environmental conditions guided by the fl ood pulse in the Pantanal of Mato Grosso.KEY WORDS: Abiotic factor, age structure, aquatic macrophyte, grasshopper Os ortópteros, herbívoros em sua maioria, são componentes essenciais da fauna em muitos ecossistemas, o que torna o estudo de suas populações fundamental, tanto pelos prejuízos que podem causar nos sistemas agrícolas, quanto pelo seu uso como controladores de pragas e de plantas daninhas. Fatores bióticos e/ou abióticos são forças seletivas que infl uenciam a evolução de características, morfológicas e comportamentais para que os insetos se adaptem às mudanças ambientais (Karpakakunjaram et al 2002). Assim, condições climáticas como temperatura, precipitação e insolação podem atuar na dinâmica das populações, modifi cando a intensidade, duração e periodicidade de sua reprodução e ciclo de vida.Cornops aquaticum (Bruner) é um gafanhoto semiaquático originário da bacia Amazônica, que tem como plantas hospedeiras Eichhornia crassipess, E. azurea, Pontederia cordata e P. lanceolata

Due to the important ecological role of Nymphalidae as consumers of fermented fruits, excrement, exudates of decomposed plants and animals, as well as bioindicators of environmental quality that attract the interest of the general public, this study aimed to characterize the fauna of frugivorous butterflies at the Serra Azul State Park – PESA (Mato Grosso, Brazil) with regards to composition, taxonomic richness and spatial distribution. Collections were carried out in 2014 from six 250 m plots in a RAPELD module (5x5 km). We defined five sampling points in each plot and placed a Van Someren-Rydon trap (VSR), with a bait made from banana fermented in cane juice, positioned 1 m above the ground for 24 hours. We collected 204 specimens of Nymphalidae from five subfamilies, 22 genera, and 40 species. Satyrinae was the most abundant and species-rich subfamily. The community structure varied spatially, with the gallery forest presenting the greatest richness, diversity, and equitability, while ‘cerrado ralo’ presented higher abundance and less diversity and equitability. Therefore, according to the pattern of abundance in the PESA, species were best adapted to the log series model. Yphthimoidesrenata (Stoll, 1780) (Satyrinae), Hamadryasferonia (Linnaeus, 1758), and Callicoresorana (Godart, 1824) (Biblidinae) were the most abundant species, 19 species were singletons, and eight were doubletons. Richness estimators showed that 63% of all species were sampled. Our results indicate that the frugivorous butterfly community is structured according to phytophysiognomies, and the dominance of species that are tolerant to disturbances indicates landscape fragmentation within the PESA, which interferes with species substitution pattern and their abundances in different environments of the park.