Cecidomyia trifolii, Canandian Entomologist, vol. xi., p. 44. 1879.I am indebted to Dr. Hagen, of Cambridge, Mass., for the information that the name which I had selected for the clover-seed fly was preoccupied by Franz Loew, in Verhandl. Zool. Bot. Gesell., Wien, 1874, vol. xxiv., where he describes (p. 142) the male and female, larva, pupa and gall of a species occurring in a folded leaf of Trifolium pratense, and figures (pl. 2, f. 4) the deformation of the plant.