Son of the Rev. Thomas William Daltry (1832-1904) of Madeley Vicarage, Newcastle, Staffordshire. Educated at Marlborough College. Joined the staff of the London and North Western Railway Works at Crewe as a locomotive designer and tester. After retiring he moved to Rugby where he died. Daltry's interest in entomology began with Lepidoptera and Hymenoptera and is recorded to have been first stimulated when he was at Marlborough by Edward Meyrick, although his father, who was also an entomologist, must presumably have been an influence too.