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)

groove. Anterior lobes of mesoscutum weakly coriaceous, lateral ones highly polished. Mesoscutellura with some scattered punctures posteriorly, mesothoracic postscutellum polished as is metascutellum. Mesopleuron densely covered with hairs, mesosternum polished. Legs on the anterior side whitish, posteriorly black, though coxae, trochanters and femora of middle and hind legs mostly black. Wings uniformly brownish inf uscate, veins and pterostigma dark brown to black. Second anal crossvein arcuate and adjoins first discoidal cell in front of its middle. Abdomen black, highly polished. Sternal plates with narrow whitish band at hind margin. Hypopygium depicted in Fig. 1. Sawsheath in lateral view resembling a knife-blade, in dorsal view narrow, ending in a point. The bilateral bristles somewhat bending inwards at apical part. A portion of the saw, showing the construction of the teeth, as in Fig. 9. Length: 5.5-7 mm. — Alar expanse: 12-16 mm. Male. — Black and dirty white. Head contracted behind eye, otherwise highly similar both in structure and coloration to the female. The differences are as follows. Apical joint of the labial palp black. The broad margin of the antennái sockets white. The apical margin of both scape and pedicel also white. Last 4-5 antennái joints entirely rusty brown, while joints 6-7 rusty brown only underneath. Tegulae entirely white. The lateral side of pronotum with a large white spot. Cenchri white. Legs more extensively light-coloured, thus, middle and hind femora and tibiae on the anterior side whitish. Epiproctum whitish in the middle. External parameres with broad yellow margin apically. Penis valve shown in Fig. 10. Length: 3.5-5.5 mm. — Alar expanse: 9-11 mm. Larva. — Yellowish white. Head light brown, though frontal suture and metavertical part yellow. Labrum evenly emarginated on front margin. Clypeus deeply, almost triangularly, excised anteriorly. Frons scutiform, divided into three distinct fields by a distally convergind pair of grooves, proximally grooves pass into lateral margin of clypeus. Antenna four-jointed bearing a long white bristle apically. Pronotum with a pair of large light brown spots, the rest of thoracic and abdominal tergites yellowish white. Prosternum with a peculiar X-shaped, brown, sclerotized mark. Meso- and metasternum with a large, medial spot each. Anal ring with very regular, necklace-like sclerotization with numerous small denticles (Fig. 16). — Length: 13 mm. The larva feeds both in the leaves of Acer campestre and A. pseudoplatanus found in open landscape, along roads and in hedges. The egg is laid in one of the apices of the leafand the emerging larva mines towards the middle of the leaf (Fig. 13). The fully fed larva spins its cocoon inside the mine, which remains in the leaf, and in the autumn falls to the ground. In the lower regions (e.g. in the eastern part of Lower Austria and Burgenland), the cocoons are completed at about the end of July and in the beginning of August. On the other hand, Figs 1-4. The female's hypopygium of 1 = Heterarthrus leucomelus (KLUG), 2 — H. aceris (KALTENBACH), 3 = H. healyi nom. n., 4 = H. cuneifrons sp. n.