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

Gall (Figs 9-10). A spangle gall, usually found in small groups (up to 5-6) on the underside of the leaf lamina. The gall is flat, 2-4 mm in diameter, 1.5-2.0 mm high, upper part slightly impressed in the centre, covered by short pale silk; if it occurs in groups, than the shape of some crowded galls is deformed. The gall is attached to lateral veins by a fine petiole; the gall does not erupt through the upper surface of the leaf, but forms a small pale mark on the upper surface indicating a gall beneath; galls are reddish, parenchima is thick when mature; in the centre of the spongy tissue is a hard walled central larval chamber, which do not surrounded with air chambers, parenchima around the central larval chamber thick and hard. Diagnosis - This species is most closely related to Neuroterus lanuginosus GlRAUD, 1859. In Neuroterus gyulaigaraiae sp. n. the head, especially frons and interocellar area, is alutaceous or very delicately coriaceous, lower face is also delicately coriaceous, without micropunctures; head in frontal view is more transverse, genae behind compound eyes are less broadened (Figs 1 -2). The scutum and scutellum are always smooth, glabrous or alutaceous, never coriaceous (Figs 4-5). The pronotum is laterally without distinct white setae; the mesopleuron is smooth shiny or with very delicate parallel striae in the posterior half and in the middle (Fig. 6); the dorsellum is very narrow, smooth, shiny; the ventral impressed area of the dorsellum is smooth, shiny, very narrow, 1/3 to 1/4 of the dorsellum height; the propodeum is with very few short striae, the lateral propodeal area is with a very few sparse, short, white setae, especially above the attachment of hind coxae (Fig 7). In Neuroterus lanuginosus the head, especially frons and interocellar area, is coriaceous, with some distinct strong striae; lower face is with stronger sculpture and with distinct micropunctures; genae behind compound eyes are more broadened (Figs 11-12). The scutum and scutellum are sometimes with stronger sculpture, coriaceous (Figs 13-14). The pronotum is laterally with distinct white setae; the mesopleuron is usually with larger striated area, striae are more distinct and strong (Fig. 15); the dorsellum is very narrow, smooth, shiny; the ventral impressed area of the dorsellum is 1/2 of the dorsellum height; the propodeum is with stronger, more distinct and longer striae, the lateral propodeal area is usually with denser white setae (Fig 16). The gall of Neuroterus gyulaigaraiae sp. n. most closely resemble that of Neuroterus lanuginosus. However, the latter is usually larger, with much more dense silk on it, the height of the gall is also larger, 3^4 mm or even more. The upper part of the Neuroterus lanuginosus gall is usually rounded and not flat and impressed; the central larval chamber is usually surrounded with some air chambers (Figs 17-18). Etymology - The new species is named in honour of Drs PÉTER GYULAI and ADRIENNE GARAI, friends and colleagues, who collected this species.