A revision of the west Palaearctic pear psyllids (Hemiptera: Psyllidae)

The status and taxonomy of the west Palaearctic Pyrus -feeding psyllids are reviewed, and keys for the identification of adults and larvae are given. The species, now referred to the genus Cacopsylla , have been much confused. They are shown to comprise seven distinct species: C. pyrisuga (Förster), C. pyri (L.) (summer form pyrarboris , winter form pyri ), C. pyricola (Förster) (summer form pyricola , winter form simulans ), C. bidens (Šulc) (summer form vasilevi syn. n., winter form bidens ), C. notata (Flor) sp. rev., C. permixta sp. n. (= simulans sensu Loginova and Gegechkori nec Förster) and C. fera (Baeva). Psylla horvathii Šulc and P. vicina Šulc are synonymized with C. pyricola; P. picta is regarded as a nomen dubium. Information is given on the host-plants and distribution of each species.