Abstract: From 2005 to 2007, field studies undertaken in West-Cameroon permitted to enrich the biodiversity of Psyllids of Psyllidae family. This family include 7 sub-families which are: Aphalaroidinae with Yangus genus (4 species); Ciriacreminae with 3 genus and species (Heteropsylla cubana, Ciriacremum sp., Kleiniella sp.); Diaphorininae with 2 genus, Diaphorina (4 species) and Epipsylla (1 species); Paurocephalinae with 2 genus, Paurocephala (5 species) and Diclidophlebia (1 species); Rhinocolinae with 2 genus, Cerationotum (2 species) and a new genus with 1 species; Spondyliaspidinae with 2 genus, Ctenarytaina (1 species) and Blastopsylla (1 species); Psyllinae sub-family is the most diverse with 14 genus among which only 4 genus are knew; Cacopsylla (1 species), Acizzia (1 species), Psylla (3 species), Palaeolinbergiella (4 species); 5 genus are new to Science. Among the 37 species captured during this survey, 35 are unknown and Blastopsylla occidentalis, eucalyptus psyllid is captured for the first time in West- Cameroon. Host plants belong to more than 16 families. The damages caused by psyllids are mainly leaves folded, wrapped, deformed, discolourated with necrosis and these leaves become dry.