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)

Male. — Black and ivory-white. Head weakly contracted behind eyes. In the main characteristics it is similar to the female but he ivory-white colour is more extensive: labrum, clypeus (excepting extreme hind margin), malar space including portgenal area, palps, a large U-shaped mark on the interantennal area, inner orbit broadly. Scape and pedicel with a yellow apical ring, six apical antennái joints reddish brown below. Tegula entirely, lateral and hind margins of pronotum broadly ivory-white. Cenchri dirty yellow. Legs more extensively white, including coxae, trochanters, anterior side of fore femora, apices of other two femora. Epiproctum and cerci also white. Penis valve as shown in Fig. 11. Length: 2.5-3.5 mm. — Alar expanse: 7-9 mm. Larva. — Yellowish white and rather slender. Head brown, frontal suture dark brown. Labrum evenly emarginated on front margin, clypeus excised anteriorly, frons disciform, divided into three distinct fields, but the middle one is very narrow, distally the grooves run parallel. Antenna 4-jointed bearing a bristle apically. Pronotum with a pair of large brown blotches, mesonotum with only a pair of very small brown dots. The rest of the thoracic and abdominal tergites yellowish white. Prosternum with the peculiar X-shaped brown mark, whose upper branches are almost horizontal and confluent with the brown colour encircling the fore pair of legs. Meso- and metasternum with a large roundish spot medially. Legs also with brown flecks. Abdominal sternites each with a small medial sclerotization down to the anal ring. This latter much resembles that of aceris (KALTENBACH) though even less number (5-6) of dentiform sclerotizatons build up the ring itself. — Length : 9 mm. The larva feeds exclusively in the leaf of Acer campestre found in open landscape, along road and in hedges. The egg is laid in one of the apices of the leaf (as in aceris; cf. ALTENHOFER 1980b: 125, Abb. 2b) and the emerging larva mines towards the middle of the leaf (Fig. 17). The fully fed larva spins its cocoon in the mine and similarly to that of aceris (KALTENBACH) perforates the upper epidermis of the leaf, so eventually the cocoon falls off (see ALTENHOFER 1980b: 129, Abb. 5). The diapausa begins in about the last decade of June. The rearings produced 57 females and 30 males. Material examined. — Austria: Asten b. Linz, larva ex Acer campestre 6. V. 1977, leg. Altenhofer (3 specimens); Linz, larva ex A. campestre 11. V. 1977, leg. Altenhofer (8 specimens); Linz, 4. V. 1978, larva ex A. campestre 3. VI. 1977, leg. Altenhofer (20 specimens) ; St. Pölten, 26. IV. 1977, larva ex A. campestre 16. VI. 1976, leg. Altenhofer (5 specimens), also on 27. IV. 1977 (2 specimens), 28. IV. 1977 (15 specimens), 30. IV. 1977 (1 specimen). — France, Lille (Service de la Protection des Végétaux), IV. 1960, leg. H. Chevin (ex élevage) (2 specimens). — A total of 56 specimens. Heterarthrus cuneifrons sp. n. Female. — Shining black and dirty white. Head black with the following parts dirty white: labrum (though basally two small black dots present) anterior one-third of clypeus (up to transverse furrow), small spot on inner orbit at height of the middle of frons, apical half of the third joint of the maxillary palp, joints 4 and 5 of the same, all joints of labial palp excepting apical one. Surface of head covered with densely set silvery pubescence. Labrum on front margin broadly rounded, clyFigs 15-16. The anal ring of the larva of 15 = Heterarthrus aceris (KALTENBACH), 16 — H. leucomelus (KLUG) 13 Term. Tud. Múz. Évk. 1987.