Abstract
The oviparous female and male of the rare aphid, Periphyllus singeri (Borner), are described and illustrated for the first time. Notes on distribution and host plants are presented. Keys are provided to known oviparae and males of European species ofPeriphyllus. The genus Periphyllus van der Hoeven belongs to the subfamily Chaitophorinae and consists of approximately 50 monoecious and holocyclic species associated with Acer spp. (maples), or exceptionally with Koelreuteria spp. or Aesculus spp. (Blackman & Eastop, 1994). In Europe 14 species have been recorded: P. acericola (Walker), P. aceris (Linnaeus), P. bulgaricus Tashev, P. californiensis (Shinji), P. coracinus (Koch), P. hirticornis (Walker), P. lyropictus (Kessler), P. minutus Shaposhnikov,P. obscurus Mamontova, P. rhenanus (Borner), P. singeri (Borner), P. steveni Mamontova-Solukha, P. testudinaceus (Fernie), and P. venetianus Hille Ris Lambers. Among these species, P. singeri is regarded as extremely rare and sporadic in occurrence. Thelack of records is interesting, because apterous viviparous females are rather large (2.40-3.40 mm long), reddish-brown and are monophagous on sycamore trees, A. pseudoplatanus. The life cycle of this species is without aestivating dimorphs (Szelegiewicz 1985).
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