S. Mahunka szerk.: Folia Entomologica Hungarica 48. (Budapest, 1987)

2 (3) Paratergites (laterotergites) of segment 8 large, meeting medially, segment 8 ventrally bulbous, not dissected. Stenopterous, hemelytra covering genital segment male 3 (2) Paratergites of segment 8 less developed, not meeting medially, segment 8 ventrally flat, split medially. Hemelytra not entirely covering genital segment. (Females) 4 (5) Hemelytra reaching segment 8 (no semimacropterous specimen was found in the material) macropterous female 5 (4) Hemelytra reaching segment 3 only brachypterous female 6 (1) External genitalia not fully developed, abdominal segments 9 and 10 always visible. Hemelytra and scutellum not distinct, degree of development various, or invisible. (Larvae) 7 (14) Wing pads and scutellum recognizable. Tergite 8 deeply sinuate medially to embody segments 9 and 10. 8 (13) Wing pads reaching beyond scutellum posteriorly. 9 (12) Wing pads of mesothorax covering metanotum and reaching to the middle of abdominal tergite 2. Fundaments of external genitalia visible on the ventral side. Antenna! formula 18 : 27 : 23 : 32. Tibial comb of fore leg comprising 4-5 bristles. Segment 8 posteriorly reaching beyond segment 9 and 10. (Fifth instar larvae) 10 (11) Fundaments of external genitalia form two tubercles medially on sternite 9 .... L5 male 11 (10) Fundaments of external genitalia form 2+2 median chitinous scales each posteriorly on segment 8 and anteriorly on segment 9 L

5 female 12 (9) Wing pads of mesothorax reaching middle of wing pads of metathorax. No fundaments of external genitalia visible. Segments 8, 9 and 10 about equilongous posteriorly. Antennái formula 19 : 24 : 21 : 36. Tibial comb of fore leg comprising 2-3 bristles. Eyes consisting of more than 50 ommatidia L4 13 (8) Wing pads hardly visible, not longer than scutellum. Posterolateral edge of segment 9 reaching posteriorly beyond middle of segment 10. Antennái formula 19 : 21 : 21 : 40. Tibial comb of fore leg comprising 1-2 bristles. Eyes consisting of more than 50 ommatidia . . L3 14 (7) Scutellum and wing pads invisible. Tergite 8 evenly sinuate, not strongly sinuate medially. 15 (16) Coiled setae present, olypeus long, anal opening open. Segment 10 long, protruding posteriorly. Posterolateral edge of segment 9 not reaching the middle of segment 10. Antennái formula 18 : 21 : 18 : 43. Tibial comb of fore leg comprising 1 bristle. Eyes consisting of about 35 ommatidia L,2 16 (15) Coiled setae absent, olypeus short, anal opening closed. Lateral border of abdominal segments describe a continuous arch, segment 10 not protruding. Antennái formula 20 : 20 : 20 : 40. Tibial comb of fore leg comprising 1 bristle. Eyes consisting of about 20 ommatidia Ll 3. Phenology Aradus cinnamomeus has a two years life-span in Hungary as well as - already well known in Central Europe. Overwintering takes place mostly but not exclusively in L4 and adult stage. The population in one locality or on one tree thus belong to two generations and the population structure depends highly on the time period and on the relative abundance of the two generations. Changes of proportion of the different developmental stadia are illustrated on a series of subsequent age-group diagrams (Fig. 1). The structure of the overwintering population will be discussed below. On the basis of field observations and the different quantitative samplings located relatively close to each other (the three localities are some 10-20 km from each other) we could follow the phenology of the species which showed little variations in 1978-1982 and 1983-1.984. Though mating was in a few instances observed in the autumn, eggs were not found before the middle of April. First instar larvae appear in larger numbers at about the end of May and (In the laboratory) after two days, without feeding, moult to second instar. With fortnightly sampling we were unable to follow the first three stages; in the middle of August most larvae were in the fourth instar. Moulting