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

sally also; all tergites smooth, without punctures, metasomal tergite 2 occupies 0.35-0.4 of mctasoma in dorsal view (Fig. 13). Ventral spine of hypopygium slender, prominent part 2.8-3.0 times as long as broad, with sparse but long white setae, only the most apical setae reach beyond the apex of the hypopygium (Fig. 14). Gall (Figs 15-18). Typically the galls are in a crowded mass encircling a twig. Usually the galls develop on young shpots, right at the ground surface or slightly above. The gall cluster more or less rounded, 35-50 mm in diameter, with 18-35 galls in one cluster. Colour of the young growing gall yellow to yellow-white, later becoming reddish-green and then brown or blackish brown when the gall matures. Single galls are elongated, resembling pine-cone seeds, while those in groups may become cuboid due to crowding. Galls are 15-22 mm long and 10-13 mm in diameter in their broadest apical part, narrowing continually towards the base by which they are attached to the twig (Fig. 18). The position occupied by the gall on the twig is marked by a crater or a scar on the bark. In some galls a tunnel-like hollow is formed which extends from the top of the gall toward the inner larval chamber. Each single gall is monolocular. The larval chamber is ovate, 5-8 mm in length and 3-5 mm in diameter, with 1.5-2.2 mm thick, hard, lignificd walls, which are not clearly distinct from the surrounding gall parenchyma. The larval chamber usually located in the basal 1/3 or at the main base of the gall. The gall parenchyma is juicy and soft when the gall is young, becoming lignified and hard when mature. Diagnosis - This species' morphology links it to a group of species (Andricus polycerus (GlRAUD, 1869), A. coriarius (HARTIG, 1843) and A. conglomeratus (GlRAUD, 1859)) that form a distinct group between the kollari and hartigi clades within the genus Andricus (ROKAS, MELIKA et al. 2003, STONE & COOK 1998). The following morphological peculiarities link Andricus stonei sp. n. most closely to Andricus polycerus (GlRAUD, 1859): mesoscutum, especially internotauli area distinctly punctate, area between punctures shining and smooth, alutaceous or weakly coriaceous; the prominent part of the ventral spine of hypopygium around 3.0 times or less as long as broad, Fl longer than F2; tergite 2 and 3 without punctures; central propodeal area only slightly pubescent, setae restricted to the upper part, along lateral propodeal carinae. In Andricus stonei sp. n. the median elevated area of the lower face under antennái toruli with distinct deep punctures; the malar space is very delicately coriaceous, with very indistinct delicate striae (Fig. 1), Fl

2 longer than Fl 1 (Fig. 4); the mesosoma more elongated, 1.3 times as long as high (Fig. 9); the scutellum 1.6 times as short as the scutum, rounded, as broad as long in dorsal view, scutellar foveae less transverse, very delicately coriaceous with punctures, which are very distinct in the anteromedian 1/3 between and behind scutellar foveae (Fig. 8); the ventral impressed area of the dorsellum smooth, without longitudinal striae (Fig. 10); metasomal tergite 2 occupies 0.35-0.4 of the metasoma in dorsal view (Fig. 13). In Andricus polycerus the median elevated area of the lower face under antennái toruli is dull coriaceous, without distinct deep punctures; the malar space with strong radiating striae; ocelli smaller and located in a more flattened triangle (Figs 19-20); Fl 2 slightly shorter than Fl 1 (Fig. 21); the mesosoma slightly less than 1.2 times as long as high (Fig. 23); the scutellum 1.4 times as short as the scutum,