RESUMEN
In this paper, the seasonal abundance of 25 sandfly species (1 of the Brumptomyia genus and 24 of the Lutzomyia genus) found at P1V5, municipal district of Buriticupu, Maranhão State, is discussed. The capture was carried out from 18:00 P.M. to 6:00 A.M., once a month, from January to December 1996. CDC light traps were set up in the forest, in the peri and intradomicile environments. Five species were only found in the rainy season (January to June), being represented by one or two individuals; eight species occurred only in the dry season (July to December) and eleven species appeared in both seasons. The most frequent species in the dry period were: L. whitmani (26.3 percent), L. serrana (23 percent), L. choti (22.8 percent), L. evandroi (7.5 percent), L. longipalpis (5.8 percent), L. termitophila (3.3 percent), L. shannoni (3 percent) and L. migonei (2.5 percent). In the rainy season, L. whitmani was the prevailing species (74 percent), followed by L. termitophila (4 percent), L. umbratilis (3.4 percent), L. serrana (2.8 percent), L. evandroi (2,8 percent) and L. claustrei (2.4 percent). L. whitmani was thought to be an annual species, occurring in the entire year of study. The others species, with exception to L. serrana and L. evandroi, showed a seasonal, punctual or peripheric pattern