Holotype ♂ of Trioza horii Miyatake, 1991 deposited in Osaka Museum of Natural History according to Miyatake (1991): 20 ; (OMNH TI 32): Miyazuma-kyo, alt.ca 600 m, between Mt. Kamagatake (alt. 1,100 m) and Mt. Nyudodake (alt. 906 m), Miyazuma-cho, Yokkaichi City, Mie Prefecture, 1.xi.1987, T. OHKAWA leg. [Size: Length of body 2.1 mm; to tip of folded wings 4.2 mm; length of forewing 3.6 mm]