O. Merkl szerk.: Folia Entomologica Hungarica 67. (Budapest, 2006)

very rapidly; gall initially gall green, later becoming pale green when mature. Old galls are brown and dried out. The gall is 15-20 mm in length, with a diameter of 8-10 mm in the widest part. Monolocular, the larval chamber located at the base of the gall, unseparable from the parenchyma. When mature the gall is hard, partially lignified. Up to three galls can be formed on a single leaf. Diagnosis - Dryocosmus mikoi sp. n. female resembles somewhat D. tavakolii described above. However, D. tavakolii can be easily distinguished from D. mikoi as well as from all other known Western Palaearctic Dryocosmus species, by the general appearance of the head, absence of striae on the lower face and malar space, nearly straight notauli, nearly smooth, unsculptured, elongated scutellum; smooth, unsculptured mesopleuron; the central propodeal area, without distinct lateral propodeal carinae. Dryocosmus mikoi sp. n. most closely resembles Dryocosmus mayri MÜLLNER, 1901 and D. cerriphilus GlRAUD, 1859, sexual generation (= D. nervosus GlRAUD, 1859, recently synonymized as the sexual generation of D. cerriphilus (STONE et al. 2006). Dryocosmus mayri was moved to the genus Chilaspis M AYR, 1881 (PUJADE-VILLAR et al 2003). However, recent DNA sequence based analysis shows that this species definitely belongs to the genus Dryocosmus: phylogenetically and genetically more closely related to other Dryocosmus species than to known Chilaspis species, and thus its status as a Dryocosmus species has been restored (ÁCS et al. 2006). Dryocosmus mayri can be easily distinguished from D. mikoi by the following characters: body entirely black, with some dark brown areas only on the head Figs 110-111. Dryocosmus mikoi sp. n., gall (photos by M. TAVAKOLI)