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. The use of pupal exuviae is a method that allows evaluating the environmental condition using information provided by the diversity of Chironomidae. The exuviae can disperse over distances up to 100 m from where the adults emerged, allowing perform detailed studies on the local community. The aim of this study was verify whether there are differences in the taxonomic richness and abundance in the emergence of pupal exuviae of Chironomidae during different periods of day in three urban Cerrado streams. The samples were taken in the dry season of July 2011, in three first-order streams located nearby Anapolis municipality, Goias State, Brazil, using drift nets for a period ranging from 8 to 20 h, with removal and replacement of the drift nets every two hours period. 6.129 exuviae were collected in the three streams and the Onconeura and Polypedilum generatotaled 70% of all individuals collected. The time at 16 h was the most representative of the number of exuviae collected, while the first time (8 h) had the lowest amount of exuviae. The genera richness and abundance of exuviae did not show changes according to the time of day on the streams, indicating that there is not a period in which there is a greater frequency of adult emergence of Chironomidae. E xuvias de Pupa de Chironomidae (Diptera) em Riachos Urbanos de Cerrado: existe um Melhor Horario do Dia para Amostrar? Resumo. O uso de exuvias de pupa e um metodo que permite avaliar condicoes ambientais utilizando informacoes da diversidade de Chironomidae. Exuvias de pupas podem se dispersar em distâncias de ate 100 m dos locais onde os adultos emergiram, permitindo realizar estudos sobre a comunidade local. O objetivo deste estudo foi verificar se existem diferencas na riqueza taxonomica e abundância em exuvias surgidas de pupa de Chironomidae durante diferentes periodos do dia em corregos urbanos do Bioma Cerrado. As amostras foram coletadas na estacao seca de julho de 2011, em tres riachos de primeira ordem localizados proximos a cidade de Anapolis, Goias, Brasil, utilizando redes de deriva por um periodo que variou de 8-20 h, com remocao e substituicao das redes a cada duas horas. Foram coletadas 6129 exuvias nos tres corregos e os generos Onconeura e Polypedilum totalizaram 70% de todos os individuos coletados. O horario de 16 h foi o mais representativo em relacao ao numero de exuvias coletadas, enquanto que as exuvias coletadas as 8 h foram menos abundantes. A riqueza e a abundância de generos de exuvias nao apresentaram mudancas de acordo com o horario do dia nos corregos estudados, indicando que nao existe um periodo no qual ha uma maior frequencia de aparecimento de Chironomidae adulto.

Surface-Floating Pupal Exuviae of Chironomidae (Diptera) in Urban Streams: is There a Best Time of Day to Sample Them?