flea-louse

Century Dictionary and Cyclopedia

1. n. The popular name of the homopterous insects of the family Psyllidæ, resembling in general appearance the aphides or true plant-lice, but distinguished by the difference in the fore wings, which have a distinct marginal vein. In the larval state the flealice feed on the leaves or tender stems of various plants. A few species are also called gallmakers. To these belongs the genus Pachypsylla (Riley), which is distinguished from Psylla proper by the very convex head, oval frontal lobes, and short antennæ. Pachypsylla celtidis-mamma infests the hackberry (Celtis), the larvæ producing bud-like galls on two-year-old twigs. Another genus is Trioza. The flealice are also called jumping plant-lice, from their habit of leaping.

Wiktionary

1. n. A jumping plant louse of the family Psyllidae, of many species.

GNU Webster's 1913

1. n. (Zoöl.) A jumping plant louse of the family Psyllidæ, of many species. That of the pear tree is Psylla pyri.