Streams located in areas of sugar cane cultivation receive elevated concentrations of metal ions from soils of adjacent areas. The accumulation of metals in the sediments results in environmental problems and leads to bioaccumulation of metal ions by the aquatic organisms. In the present study, bioaccumulation of the metals ions Al, Cd, Cr, Cu, Fe, Mg, Mn and Zn in aquatic insects in streams impacted by the sugar cane was evaluated. The results pointed out that the insects were contaminated by the sediment and that the collector organisms as Chironomus species accumulated higher concentration of metals than the predator organisms.

Sugar cane cultivation in the State of São Paulo has expanded in the last years, with an annual production of 200•10(6) t in an area of 2.5• 10(6) hectares. The use of herbicides, pesticides and fertilizers in sugar cane plantations, together with deforestation of riparian vegetation, have caused impacts on the hydric resources of the adjacent areas. The aim of this work is to evaluate the influence of sugar cane plantations on streams in the central region of the State of São Paulo, studying 16 organochlorinated compounds and 7 metals (Cu, Fe, Cd, Zn, Mn, Cr and Ni) found in the sediments of 11 streams. The results show that there is a higher concentration of metals and organochlorinated compounds in streams without riparian vegetation when compared to forested areas.

Tanytarsus obiriciae, spec. nov., nova espécie de Tanytarsini da região Neotropical é descrita com base em todos os estágios, macho e fêmea adultos, pupa e larva. As larvas foram encontradas vivendo associadas a macrófitas aquáticas em lagoas e lagos da região norte do Estado de São Paulo, Brasil. Informações sobre a dinâmica numérica das larvas e a periodicidade da emergência dos adultos são apresentadas.

Tanytarsus obiriciae, spec. nov., a new Tanytarsini from the Neotropics is described based on male and female adults, larvae and pupae. The larvae were found living associated with aquatic macrophytes in ponds and lakes from the Northern Region of São Paulo State, Brazil. Information on larval abundance dynamics and the adults' emergence periods is presented.

A ocorrência de oligochaeta vivendo sobre Odonata é relatada pela primeira vez. Foram encontrados Nais variabilis (Piguet, 1906) (Oligochaeta: Naididae) e Chaetogaster diastrophus (Gruithuisen, 1828) (Oligochaeta: Naididae) vivendo sobre Elasmothemis cannacrioides (Calvert, 1906) (Anisoptera: Libellulidae) e sobre Mnesarete (Cowley, 1934) (Zygoptera: Calopterygidae).

The occurrence of oligochaetes species living on larvae of Odonata is reported for the first time. There were found Nais variabilis (Piguet, 1906) (Oligochaeta: Naididae) and Chaetogaster diastrophus (Gruithuisen, 1828) (Oligochaeta: Naididae) living on Elasmothemis cannacrioides (Calvert, 1906) (Anisoptera: Libellulidae) and on Mnesarete (Cowley, 1934) (Zygoptera: Calopterygidae).

Levantamento preliminar dos gêneros e espécies de Baetidae (Insecta: Ephemeroptera) do Estado de São Paulo, com ênfase em coletas realizadas em córregos florestados de baixa ordem A despeito dos avanços alcançados recentemente com relação ao conhecimento faunístico de Baetidae no Brasil, assim como na Região Sudeste, até o presente trabalho somente três espécies nominais haviam sido registradas para o Estado de São Paulo. Baseados em coletas realizadas em quinze córregos de baixa ordem localizados em seis macro-regiões do estado, os seguintes táxons de Baetidae são reportados: Americabaetis alphus, A. labiosus, A. longetron, Apobaetis fiuzai, Aturbina georgei, Baetodes cf. serratus, Callibaetis sp. 1, Callibaetis sp. 2, Camelobaetidius anubis, Cloeodes irvingi, Cryptonympha sp., Paracloeodes eurybranchus, Waltzoyphius fasciatus e Zelusia principalis.

Preliminary survey of genera and species of Baetidae (Insecta: Ephemeroptera) from São Paulo State, with emphasis in the fauna sampled in low order forested stream. Although in Brazil, there has been an increasing number of studies on Baetidae in the last years, until the present study only three nominal species have been reported from the São Paulo State. Herein, we report the following taxa sampled in 15 low order forested streams from different macro-regions of São Paulo State: Americabaetis alphus, A. labiosus, A. longetron, Apobaetis fiuzai, Aturbina georgei, Baetodes cf. serratus, Callibaetis sp. 1, Callibaetis sp. 2, Camelobaetidius anubis, Cloeodes irvingi, Cryptonympha sp., Paracloeodes eurybranchus, Waltzoyphius fasciatus, and Zelusia principalis.

Development rate, survival and growth of a neotropical midge, Chironomus sancticaroli, were determined in laboratory at different temperatures. The "lower thermal limit" is 12ºC and the "thermal constant", characteristic for the species, varies from 140-144 day-degree. These results pointed out to a high development when compared with species of temperate areas and permit to expect, for C. sancticaroli, 16-18 generations/year, in natural conditions.