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Psylla alni Family: Psyllidae Psylla species are close to Cacopsylla, but most species are generally larger; they usually have distinctive genitalia. A very large psyllid which is predominantly green, including the costal marginal vein. The antennae are very long (more than 2.55X head length), and the female terminalia  long and slightly curved. The wing veins are much darker than the membrane (unlike in Baopelma foersteri, which also occurs on Alder), and the membrane has dark spinules over much of the surface. The body can develop red or brown markings in late summer. Nymphs are often covered by extensive white waxy secretions.     P. alni is a common species on Alder (Alnus spp.) across the UK. Adult: June-October Length 5-6 mm.
	Adult: north London (June 2008) ©Tristan Bantock
Adult female: Dorset (August 2011) © Mark Dunkling	Adult male: Dorset (August 2011) © Mark Dunkling
Nymphs with waxy secretions: West Yorkshire (May 2010) © Joe Botting	Nymph with wax removed: West Yorkshire (May 2010) © Joe Botting