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Abstract
For 2 consecutive years, some observations on gregarious sleeping in the solitary bee Amegilla (s. str.) garrula (Rossi) (Hymenoptera Anthophoridae Anthophorini) were conducted in the Province of Pavia (Northern Italy). During the summer of 1991 a few data were collected concerning size, composition and seasonal dynamics of the sleeping aggregation observed; these data are compared with other available findings on some species of Amegilla and Anthophora. Furthermore, notes on the behaviour of A. garrula from the assembly flights in the evening until the dispersion flights in the morning are given, and its sleeping posture is described and illustrated.