S. Mahunka szerk.: Folia Entomologica Hungarica 60. (Budapest, 1999)

es, dominated by oak. The supposed foodplants of the new species, similarly to the related T. pilosus, are Quercus species. Material examined — Holotype: male, "Síkfőkút, Malaise csapda. Erdő szélén. Sz 1987.08.19". Allotype: female, "Síkfőkút, Malaise csapda. Erdő szélén. Sz 1987.08.22". Paratypes: 5 males, 2 females, from the same locality, 18.08; 20.08; 23.08, 30.08; 3.09; 10.09; 1 male, Demjén, 12.09.1995. The type material is deposited in the Hungarian Natural History Museum, Budapest (HNHM). Description — Measures: Holotype: body length 5.12 mm, fore wing length 4.48 mm, fore wing width 1.36 mm. Allotype: body length 5.96 mm, fore wing length 5.08 mm, fore wing width 1.76 mm. Paratypes. Males: body length 4.56-5.24 mm, fore wing length 3.88-4.5 mm, fore wing width 1.28-1.54 mm. Females: body length 5.5-6.14 mm, fore wing length 4.74-5.08 mm, fore wing width 1.46-1.76 mm. External morphology (Figs 1-3) — Resembles T. pilosus but much paler in colouration. Frons, postclypeus, vertex, pronotum and mesonotum pale brownish ochreous or amber-yellow. Frons somewhat darker than postclypeus, its medial and lateral ribs prominently yellowish in contrast to brownish ground colour of vertex; ribs of mesonotum similarly yellowish. Abdomen pale brown, fore wing transparent with weak, smoky pattern, with fine tubercles along veins and apical margin (Fig. 1); intensity of darker pattern stronger in females. The fore wings of the related species are usually with stronger maculation (Figs 2-3; 2: T. pilosus; 3: T. desertorum), the pattern is strongly variable, especially in T. pilosus. Fore wings of T. soosi are narrower than those of T. pilosus, length/width rate is 3.02 in Figs 1-3. Fore wings of Tachycixius spp. 1 : Tachycixius soosi sp.n., 2: T. pilosus, 3: T. desertorum. ( Scale bar = 1 mm )