In this work, the richness and relative abundance of species of the genus Lutzomyia, in the "várzea" and "terra firme" secondary forests, in the municipal district of Paragominas, Pará State were studied. The sandflies were captured from 6:00 P.M. to 6:00 A.M. with CDC light-traps. A total of 1,184 specimens and 32 species were captured, being 680 males and 504 females. In the "terra firme" forest 942 specimens of 31 species were captured. L.complexa was the more frequent species, being represented by 41.1% of the captured specimens, followed, in order of importance by L. corossoniensis (11.6%), L. claustrei (5.7%), L. infraspinosa (5.7%), L. saulensis (5.1%), L. flaviscutellata (4.8%), L. davisi (3.5%) and L. wellcomei (3.3%). The other species represented 19.2%. In the rainy season the species richness (24) and abundance (38.8 specimens/light-trap/night) were higher than the dry season (16 species and 13.83 specimens/light-trap/night). In the "várzea" forest 242 specimens of 12 species were captured. The dominant species were L. saulensis (46.7%), L.complexa (36%) and L. shawi (7.4%). The others species represented 9.9%. The species richness (9) was higher in the rainy season than the dry season (6), but the specimen abundance was higher in the dry period (6.5 specimens/light-trap/night) than the rainy season (5.85 specimens/light-trap/night).