Tabanids are distributed all over the globe and are found in almost every habitat. The immatures live in aquatic or senti-aquatic environments, in bromeliads and on decaying logs. Currently in the Eastern Amazon approximately 150 species are known. Some of these species that have a wide distribution have already had their immature stages described from the last larval stage, but nothing is found in the literature about immature stages of most species. This paper aims to study the immature forms of tabanids in northeastern Pará: rearing larvae until the last larval stage and even adults to identify the species; describing the immature forms of undescribed species; and the environments (breeding sites) where the larvae were found. Collections were made in two areas: Guamá River Ecological Research Area (APEG) and Morelândia Farm. To date, five collections have been made, using two different methodologies: manual collection with tweezers and soil samples collected with an auger and trowel. The soil samples were taken to the laboratory to be sorted and the larvae found were deposited individually in glasses containing a small amount of soil from the respective environment. One of each morphotype was fixed, killed in boiling water and preserved in 80% E-alcohol, the rest were returned to the individual glasses where they were reared. Unfortunately, despite the collection effort, we were not able to achieve the expected results, because in all the material collected only one Tabanidae and the rest Tipulidae were collected. Although the methodology applied is the same as that used by other authors, here we were not successful. An experiment with the maintenance of adult females collected after relaying, in an attempt to obtain spawning in the laboratory, is being carried out.
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