Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 79. (Budapest 1987)

Altenhofer, E. ; Zombori, L.: The species of Heterarthrus Stephens, 1835 feeding on maple (Hymenoptera, Tenthredinidae)

maxillary and labial palps, though apical joint of each is dark brown. Lateral and hind margins of pronotum, tegula, fore and middle coxae and trochanters mostly, apex of hind coxae, the anterior surface of all legs (though tarsi fuscous). Cenchri brown, downturning portions of abdominal tergites marginally also marked by white. Antenna black, only apical 4-5 joints dark brown. Epiproctum whitish apically as are external parameres. Penis valve is shown in Fig. 12. Length: 3.5-4 mm. — Alar expanse: 8-9 mm. Larva. — Yellowish white and rather robust. Head yellow, frontal suture light brown. Labrum entire on front margin, clypeus triangularly excised anteriorly, frons scutiform, apparently entire, undivided. Antenna 4-jointed, bearing a long, white bristle apically. Pronotum with a large, though almost imperceptible, light brown fleck, mesonotum with a pair of small, similarly lightcoloured specks. Metanotum and abdominal tergites yellowish white. Prosternum with a large, light brown, X-shaped mark having a broad middle part. Meso- and metasternum with a light brown, round spot each. Other ventral plates yellowish white. Anal ring shows an intermediate form between leucomelus and aceris, i.e. the brown, dentiform sclerotizations are regularly set, but are only a few (6-8) in number (cf. ALTENHOFER i980a: 47, Abb. 9c). Length: 10 mm. The larva feeds exclusively in the leaf of Acer pseudoplatanus found in shady woods and scrub forests mixed with Carpinus, Fagus and Ulmus (e.g. Vienna woods, the environs of Salzburg, along the river Salzach south of the town). The eggs are laid in the middle of the leaf (see ALTENHOFER 1980b: 125, Abb. 2a), close to the apex of the leaf petiole, in the vicinity whence the main veins ramify. The emerging larva mines towards one of the apices of the leaf (Fig. 18; cf. RITZEMABOS 1892: Taf. 1: Abb. 1). The fully fed larva spins its cocoon within the leaf and perforates the upper epidermis of the leaf causing the drying leaf to shed the cocoon, similarly to the species of aceris (KALTENBACH) and healyi nom. n. The cocoon is completed in the last decade of June or early in July. The rearings produced 7 females and 21 males. Material examined. — Holotype Q : "Heterarthrus M. Acer pseudopl.", "c. 1985-06-05 em. 1986 April Neulengbach, NO.", "Holotypus Heterarthrus cuneifrons sp. n. Altenhofer et Zombori 1986", "Hym. Typ. No. 2938 Mus. Budapest". -—Paratypes 3 9 and 6 çf with the same labels as above, Nos. 2940-2948. Paratype 9 : "Heterarthrus sp. M Acer pseudoplatanus", "c. 1977 06 19 em. 1978 04 15 Laaben/Austria", "Paratypus 9 Heterarthrus cuneifrons sp. n. Altenhofer et Zombori 1986", "Hym. Typ. No. 2939 Mus. Budapest". Paratypes 3 çf : "Austria Innsbruck Hungerburg", "1974. VI. 2 leg. Zombori", "ex mines Acer pseudoplatanus", "Paratypus rf Heterarthrus cuneifrons sp. n. Altenhofer et Zombori 1986", Nos. 2949-2951. Paratype rf: "Heterarthrus mid", "c. 1975 06 07 em. 1976 03 01 Salzburg", "Paratypus rf Heterarthrus cuneifrons sp. n. Altenhofer et Zombori 1986", "Hym. Typ. No. 2952 Mus. Budapest". Paratype çf : "Heterarthrus mid", "c. 1975 06 07 em. 1976 02 21 Salzburg", "Paratypus çf Heterarthrus cuneifrons sp. n. Altenhofer et Zombori 1986", "Hym. Typ. No. 2953 Mus. Budapest". — A total of 16 specimens. Remarks. — The new species comes close to H. aceris (KALTENBACH, 1856), especially as far as the number of the antennái joints, the head contracted behind the eyes and the host-plant ( Acer pseudoplatanus) are concerned. However, it is a darker species since the face, and especially the malar space is entirely black (white in aceris), the tegula is black on its basal half (entirely white in aceris). The egg is laid in the middle of the leaf and the larva mines towards one of the apices of the leaf (in aceris the egg is laid in one of the apices of the leaf and the larva mines inwards). KEY TO THE FEMALES OF THE ACERIS-GROU? 1 (4) Head behind eyes parallel or, at most, weakly contracted. 2 (3) Larger specimens: 5.5-7 mm. Tegula black. Hypopygium as shown in Fig. 1 leucomelus (KLUG , 1814) 3 (2) Smaller specimens: 3.5-4.5 mm. Tegula dirty white. Hypopygium as shown in Fig. 3 healyi nom. n.