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One new species of Triphleba Rondani and eight new species of Megaselia Rondani are described from Montseny Natural Park (mainland Spain). The new species are Megaselia arbuciensis García-Romera sp.nov., Megaselia barrientosi García-Romera sp. nov., Megaselia callunae García-Romera sp. nov., Megaselia carminis García-Romera sp. nov., Megaselia ivanis García-Romera sp. nov., Megaselia longianalis García-Romera sp. nov., Megaselia montseniensis García-Romera sp. nov., Megaselia sarae García-Romera sp. nov., Triphleba beatricis García-Romera sp. nov.

Seasonal and circadian activity of scuttle fly assemblages in beech forests and highland scrublands was analysed. The scuttle flies were collected in the Montseny Natural Park (Catalonia, Spain). Seasonal fluctuations and the relation of some meteorological variables were assessed using window traps, emergence traps and pitfall traps, while circadian activity was assessed using water traps and light traps. Scuttle fly density and species richness in both habitats showed an activity peak in July. Diversity peaks were found in spring and autumn in beech forest and in summer in scrublands. Temperature was the main meteorological variable related to the seasonal dynamics of scuttle fly assemblages. We found univoltine and bivoltine species in the beech forest, while only univoltine species were found in the scrublands. Cold-adapted species were captured in winter, mainly Triphleba Rondani species. The scuttle fly circadian activity peak was at 12–15 h. Megaselia diversa (Wood, 1909) showed nocturnal or crepuscular habits.

The structure of scuttle fly communities in vegetative strata of a beech forest in the Montseny Natural Park (Catalonia, Spain) was compared. Window traps were used from March 1990 to March 1991. Relative abundance and species richness of scuttle flies were higher in the herb and shrub layers than in the canopy, while diversity was not significantly different between strata. Saprophagous species dominated in all strata, while the mycophagous and zoophagous species decreased with height. Herb layer was dominated by Megaselia pectoralis and M. subpleuralis. Shrub layer was dominated by M. pectoralis, M. pectorella, M. diversa, M. subpleuralis and M. superciliata. Canopy layer was dominated by M. pectorella, M. pectoralis, M. pusilla and M. diversa.