Abstract:Among the species of Trioza occurring in South China T. camphorea Sa-saki, T. cinnamomi Boselli and T. parthenaxyli Yang et Li feed on the plants of the genus Cinnamomum, Lauraceae; but only T. cinnamomi has beenrecored and has not been found in our country. The four new Species descri-bed in the present paper are serious pests of Cinnamomum spp. The type specimens are kept in the Insect Collection of Beijing Agricu-ltural University. 1. Trioza pseudocinnamomi, sp. n. (fig. 1) Holotype(?), allotype♀, Guangdong Prov. Guangzhou C., 1984-Ⅰ-14,paratypes 7(?)(?), 11♀♀, same as for holotype; 6♀♀, place as for holo-type, 1984-Ⅲ-27. Host plant: Cinnamomum burmannii (Nees) Bl. (Lauraceae) The new species resembles Trioza cinnamomi (Boselli 1930) but differsfrom the latter in the anus longer, about 1/3 times as long as the dorsal va-lve. 2. Trioza nigricamphorae, sp. n. (fig. 2) Holotype(?), allotype ♀, Zhejiang Prov. Hangzhou C., 1980-Ⅳ-26, pa-ratypes 1(?), 1 ♀, same as for holotype; 5 (?)(?), 9♀♀, Jiangxi Prov.Nanchang C., 1984. Host plant: Cinnamomum camphora (L. )Presl. The new species is similar to Trioza nigra Kuwayama 1910 from TaiwanProv., but differs from the latter in having body longer, male proctiger po-sterior margin strongly produced caudad into a posterior lobes. 3. Trioza camphoricola, sp. n. (fig. 3) Holotype(?), allotype ♀, paratypes 7(?)(?), 23♀♀, Zhejiang Prov.Hangzhou C., 1980-Ⅳ-26. The new species‘ appearance and parameres resemble that of the Trioza camphorae Sasaki 1910, but the new species is easily distinguished from thelatter by the body longer (camphorae is 1.3-1.7mm, new species is 2.02-2.40mm), proctiger longer and posterior margin produced into a posteriorlobes. 4. Trioza magnicomphorae, sp. n. (fig. 4) Holotype♀, paratypes 3♀♀, Yunnan Prov. Lunan Yi Aut.Co. (1600m), 1981-Ⅲ-19. Host plant: Cinnamomum sp. The new species‘ venation is similar to that of the Trioze jambolanaeCrawford 1917, but the new species differs from the latter in having thecones stout, black and the ventral valve much short.