This research was developted in 1995 from February to December, at the Ferreira Penna Research Station, in the municipality of Melgaço, state of Pará, within the Caxiuanã National Forest, with the objective of study the seasonal and daily activities in the forest and anthropic environment and the levels at which various species are found in the forest. The collects were made using human bait and CDC light trap with bird bait in the forest at ground and canopy and human bait in the anthropic environment. The total collection consisted of 1.919 mosquitoes belonging to the genera Aedes Meigen, 1818, Anopheles Meigen, 1818, Haemagogus Williston, 1896, Psorophora Robineau-Desvoidy, 1827, Culex Linnaeus, 1758, Coquillettidia Dyar, 1905, Mansonia Blanchard, 1904, Uranotaenia Lynch-Arribalzaga, 1891, Limatus Theobald, 1901, Phoniomyia Theobald, 1903, Ruchomyia Theobald, 1903, Sabethes Robineau-Desvoidy, 1827, Trichoprosopon Theobald, 1901 e Wyeomyia Theobald, 1901. The predominant species were Culex (Melanoconion) portes! Senevet & Abonnec, 1941 (50,65%), Coquillettídia (Rhynchotaenia) venezuelensis (Theobald, 1912) (9,17%) and Haemagogus (Haemagogus) janthinomys Dyar, 1921 (6,51%). The daily and seasonal activities of mosquitoes species was correlated with temperature, relative humidity and rainfall, using the Spearman correlation, and statistically significant relations were found for some species with these factors. The hypothesis of the significative difference between the species and exemplaries mosquitoes number at ground and canopy was tested using X² test, that was just significant between the exemplaries mosquitoes number at ground and canopy in human bait in the forest.
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