De Neri made his debut in 1895 at the Nuovo in Firenze as Manrico. It was reported in the press that he sang in C.
His career evolved as follows
1895 Firenze (Il trovatore in January, Teatro Nuovo, with Brandani Adele, Betti Cerratelli Polissena,
Petri Pilade, Cacialli Guido)
1896 Milano (Carcano), Lodi
1897 Messina, La Spezia, Bologna
1898 Lugano, Helsinborg
1899 Genova, Carrara, Lecce, Firenze, Sansepolcro, Perugia
1900 Crema, Genova, Verona, Cremona
1901 Lodi, Mantova, Bergamo, Venezia, Montenero, Venezia
1902 Chieti, Teramo, Torino, Asti, Venezia,
1903 Ravenna, South Africa, Milano (Lirico, La bohème on December 12 with Giorgina Caprile,
Amelia Campagnoli Cremona,
Mario Roussel, Tulio Serafin)
1904 Milano (Lirico La bohème on January 1/3/12), Palermo, Roma (Adriano), Sao Paolo
1905 Belem, Buenos Aires, Montevideo (Politeama, Urquiza)
1906 Buenos Aires, Napoli (Bellini), Livorno, Pisa, Modena, Buenos Aires
1907 Sao Paolo, Roma (Quirino, Nazionale)
1908 Firenze
1909 Livorno, Asti, Costantinopoli, Costanza
1910 Catania, Molferta
1912 Cerignola, Asola, Varese, Piacenza
1922 Costantinopoli
His repertoy included: Manrico, Fernando, Oronte, Rodolfo,
Alfredo, Duca, Faust, Elvino, Edgardo,
Arturo, des Grieux (Manon Lescaut), Nadir,
Piddu (Maricca by M. Falgheri),
Loris, des Grieux, ? (Maria di Rohan),
Turiddu, Wilhelm Meister, ? (Sarrona by H. Legrand),
Carlo (Linda di Chamounix), Cavaradossi, ...