Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 80. (Budapest 1988)

Vásárhelyi, T.: New Palaearctic Aradus species in the betulae-group (Heteroptera, Aradidae)

Aradus obscurus sp. n. (Figs 1-11) Adults: Macropterous, brownish with yellow and black colouration. Legs and antennae with whitish tubercles. — Head longer than wide across eyes. Clypeus long, protruding. Antenniferous tubercles long, pointed, with lateral tooth positioned somewhat posterior when compared to other species of the group. Antennae long, slender, relative lengths of antennái joints I to IV as 9 : 49 : 20 : 22 (male), 10 : 48 : 22 : 20 (female). Preocular tubercle long, pointed, subvertical. Vertex convex, with large, blunt tubercles. Rostrum reaching about 1/3 of metasternum, relative lengths of rostral joints I to IV as 6 : 71 : 60 : 50. — Pronotum wider on male than on female. On male, lateral margin obtuse-angled, on female more or less rounded, margin irregularly, roughly serrate. Fore disc strongly convex, hind disc elevating posteriorly. Lateral carinae short, not obvious on hind disc, midlateral carinae reaching from top of fore disc to hind margin, median carinae reaching from evenly sinuate anterior margin to straight hind margin, subparallel. — Scutellum long, with median longitudinal carina, in the middle formed by granulation only. Anterior part with two sublateral, yellow depressions, posterior part transverselly wrinkled. Margin basally and apically more elevated. — Hemelytra with relatively long basal dilatation, on male almost reaching hind border of genital chamber, on female reaching hind border of tergite VII. On membrane cubitus and media originating closer to each other than media to radius (the left hemelytron of the male holotype shows fusion of the former two basally. Trochanter and femur fused on fore and middle legs. — Abdomen oval, much longer on female than on male. Dorsolaterotergites clearly delimited from tergites, posterolateral edges on male rounded, strongly protruding, lateral border on male straight or slightly concave. Posterolateral edges on female angulate, lateral border medially slightly convex, on apical segments concave. Tip of abdomen of female is shown on Figs 9-10. Genitalia of male characteristic of the betulae-group. Tergite IX consisting of two lobes (Fig. 4), paramer similar to that of the allied species (Figs 6-7), but with developed, curious basal protrusions. Fifth instar larva: Characteristic for this group of closerly allied species (betulae and brenskei), perhaps larger and more oval (Fig. 11 ). Relative lengths of antenna! joints I to IV as 12 : 46 : 19 : 23. Tip of segment 8 much surpassing that of segments 9 and 10. Measurements (male — female): total length of body 9.2-10.6 mm, length of head 1.6-1.9 mm, width of head 1.5-1.6 mm, length of antenna 3.5-3.4 mm, length of pronotum 1.5-1.4 mm, width of pronotum 3.5-3.4 mm, length of scutellum 1.8-1.9 mm, width of scutellum 1.2-1.3 mm, maximum width of abdomen 4.3-5.1 mm. Fifth instar larva : total length of body 9.2 mm, width of head 1.5 mm, width of pronotum 2.8 mm, width of abdomen 4.8 mm. Material — Holotype, male: "Philippeville, Algérie, A. Thery", "Muz." "n. sp., spinis anteocul, color antenn" [with G. HORVÁTH'S handwriting], "Coll. Mus. Nat. Hung.", "Aradus brenskei Reuter, det. N. Kormilev, '54". — Paratypes, 1 female and 4 L

5 larvae: "Dr. F. Leuthner, Djebel Akrab. 85, N. Syrien", "Zool. Mus. Berlin"; 1 female (prepared onto dorsal side): "Massif des Mouzaia", "5268", "Collection de Bergevin", 1 female with the same locality data but written in handwriting (latter two from Mus. Helsinki). The type material is deposited in the Hungarian Natural History Museum, Budapest, in the Zoological Museum of the Humboldt University, Berlin, and in the Zoological Museum of the University of Helsinki, Helsinki. The new species is closely related to A. brenskei REUT, but differs in some characters, e. g. in brenskei lateral tooth on antenniferous tubercle positioned more anteriorly, preapical tubercle less developed, antenna thicker, scutellum shorter, abdomen of female longer and more narrowing posteriorly, media and radius originating more closely to each other, etc., and there are clear differences in the male genitalia too. Aradus obtectus sp. n. Since the species is widespread all over the Palaearctic Region and is described in different papers and handbooks, a formal description seems unnecessary. I compare the two species, which are rather similar concerning most details of their body. Some of the differences are not clear owing to the great variability of obtectus and to the few specimens of pictus at hand. Specimens of the latter species show certain variability too, e.g. in the ratio of antennái joints to the width of head or to other joints, or in the form of the female last tergite. That is why variability is shown for the antenna (Figs 12-16) and for the tip of abdomen of the female (Figs 31-34). Though there is some tendency for differenti-