I think the gall described in the last number of the Entomologist by Mr. Wm. Couper, as found on the roots of the raspberry, has never been noticed before. I have in my collection a species of gall fly, hitherto undescribed, belonging to the genus Diastrophus, which I reared in great numbers from galls found on the roots of Rubus villosus, the common blackberry; these galls were polythalamous, however, and are undoubtedly distinct from his species,