With a considerable and most unfortunate delay, we are bringing under the attention of the odonatological community that on July 11, 1984, Dr Cesare Nielsen, aged 86, passed away in Bologna, Italy. He was born in Bologna on May 24, 1898, from a Danish family that came to Italy towards the end of the last century. At the onset of World War I he went to Switzerland, where he attended Medicine studies at the Universities of Bern and Geneve, and, in 1922, took his university degree as a dentist. After returning to Bologna, he also obtained a degree in ’’Medicina e Chirurgia”, in 1925, in order to practise his profession in Italy. Severe diseases of his left ilium, followed by a surgical operation after which he limped till old age, compelled him to formally retire in 1966.