The activities were performed at a preserved forest named "Capão da Imbuia", in the urban area of Curitiba, Paraná, Brazil, during march/1990 till march march/1991. The tree holes studied, showed different features: soil distance, area and volume. 303 immatures forms from seven specie of Culicidae were caught: Haemagogus (Conopostegus) leucocelaenus (Dyar & Shannon, 1924), Culex (Culex) acharistus Root, 1927, Toxorhynchites (Lynchiella) theobaldi (Dyar & Knab, 1906), Culex (Culex) eduardoi Casal & Garcia, 1968, Culex (Culex) quinque-fasciatus Say, 1823, Aedes (Protomacleaya) terrens (Walker, 1856). Two species were the most frequent: Haemagogus (C.) leucocelaenus and Toxorhynchites (L.) theobaldi, both of them had the higlest medias during spring and summer. These species were in overposition during the caughts.
Culicidae; Haemagogus leucocelaenus; Toxorhynchites theobaldi; tree holes