The Collaborative International Dictionary
Flea-louse
Flea-louse \Flea"-louse`\, n. (Zo["o]l.) A jumping plant louse of the family Psyllid[ae], of many species. That of the pear tree is Psylla pyri.
Wiktionary
flea-louse
n. A jumping plant louse of the family Psyllidae, of many species.