LAUSR

Abstract This study examined the flight activity of adult caddisflies (order Trichoptera) in a pine-oak forest in México. Specimens were collected near the locality of Puente de los Trabajos, Sierra de Juárez, Oaxaca State using blacklight traps during four nights between 28 October and 13 November 2015. A total of 1117 specimens were collected, belonging to 10 families, 18 genera, and 28 species. Limnephilus tulatus Denning, 1962, Polycentropus casicus Denning and Sykora, 1966 and the genus Mayatrichia Mosely, 1937 are recorded for the first time from Oaxaca State. Activity and species diversity peaked between 18:00 and 19:30 h. More than 90% of all species observed had been recorded by 00:30 h, and 100% by 05:30 h. Abundance and species richness were significantly correlated with temperature and relative humidity. We found that the seasonal activity of Ochrotrichia yavesia Bueno-Soria and Holzenthal, 2004, increases in late October. Environmental variables as precipitation, wind speed and direction should also be considered, and additional sampling in different seasons of the year in other localities with different environmental conditions is also recommended.