The project "Survey of the Entomolo-gical Fauna in Paraná" (PROFAUPAR) was carried out in eight localities of Paraná, Brazil, during two years. In the first year a total of 1.607 specimens of Syrphidae were collected with Malaise trap. The species Toxomerus tibicen (Wiedemann, 1830), Microdon milis Curran, 1940 and Leucopodella gracilis (Williston, 1891) were the most abundant. The abundance and seasonality of each species are evaluated.

Bionomic characteristics of Sarconesia chloroüaster (Wiedemann, 1830) were obtained, rearing it with an artificial diet and a conlrolled temperature chamber set at 27±lºC, 70± 10% RH and 12 hours photophase. The duration of the wholeevolutive cycle ofS. cholorogaster was about 19.61 days. The incubation period was the shortest (14.30 hours), the pupal one (pre-pupal and pupal together) was the longest (9.57 days), followed by the larval period that had about 9.44 days. A life table for immature stages was done in order to obtain a survival curve. The average of the adults longevity was about 25.28 days. There is no statistical difference between the duration of male and female longevity. The duration of the periods of pre-posture and posture were almost the saine (8.41 and 10.96 days respectively), but the period of pos-posture was the shortest (5.15 days). The life tables for adults, males and females were also done and the survival curves were obtained. The results were similar for both sexes. Through the life table of fértil ity the number of generations of S. chlorogaster was estimated to be 9.81 generations/year. The females had a high fertility under the laboratory conditions used.

Morphological characteristics of the immature of Sarconesia chlorogaster (Wiedemann, 1830) were obtained rearing it on an artificial diet in a temperature controlled chamber set at 27±1ºC, 70±10% RH and 12 hours photophase. The egg, three larval instars and puparium were described and illustrated together with the lairval cephalopharyngeal skeleton. Some characters were studied, for the first time using the scanning electron microscopy.