S. Mahunka szerk.: Folia Entomologica Hungarica 43/1. (Budapest, 1982)
Table I. Measurements in mm of A. krueperi Adult o* L 5 cl L 5 ? L 4 L 3 Total length 7.33 5.86 5.97 4.19 2.84 Width of head 1.23 1.17 1.20 0.92 0.67 Width of pronotum 2.60 2.17 2.22 1.54 1.00 Length of antennái joint I 0.26 0.22 0.21 0.17 0.13 II 1.16 0.75 0.74 0.44 0.26 " III 0.45 0.35 0.35 0.26 0.17 rv 0.51 0.45 0.45 0.35 0.30 Length of antenna 2.38 1.77 1.75 1.22 0.86 reaching tip of anal tube. Rostrum reaching middle of mesosternum, thoracal sterna with shallow furrow medially. Abdomen with l/2/:2:l pattern of glabrous areas ventrally (marking, that some lateral ones have two centres). Fifth instar: Differences from instar IV as follows (Figs 3-6, 11, 14, 19, 22, 25, 29, 31, 32). Tip of appendices of head lighter than basal parts. White tubercles on antennae and legs distinct. Basis of antennái joint III brown. Relative length of antennái joints I to IV as: 49:171: 80:103 (almost no difference existing between the sexes). Pronotum with six well visible carinae, the lateral ones yellow.- Hind margin with three convex arches. Mesonotum with developed wing pads (rudiments of veins visible) and developed but indistinct scutellum. Metanotum with wing pads not reaching beyond mesonotal ones, latter reaching hind border of abdominal tergite II. Lateral margin of thorax roughly serrate. Abdominal tergites with white setigerous tubercles, segment VII and IX almost reaching, VIII much surpassing tip of anal tube. Rostrum not reaching middle of mesosternum, normally lying in a shallow furrow running along head and thoracal sterna. Median opaque areas on abdominal sternites narrower, somewhat sunken. Ventral, lateral glabrous areas with two distinct centres, however, not clearly separated in female and even less so in male. Rudiments of external male and female genitalia present. The sexes can be separated under binocular microscope in lateral view, where the rudiment of the genital chamber strongly protrudes (Figs 5-6). Coloration: Antennái joints II and III, lateral 1/4 of thorax on both sides, posterior half of paratergites, tip of femur, basis and tip of tibia are yellow as well as some spots medially on abdominal tergites in instar III. Otherwise the body is brown, antenna! joint PV is black. Coloration is darkening from instar ni to V. In the latter antenna! joints I, II and basis of IH are brown, yellow parts of thorax with several brown spots, tibia brown except tip, but median yellow spots distinct on abdominal tergites. Observations with SEM Development of some body parts was as well Investigated as some structures difficult to study under binocular microscope. Development from instar III to V m length/width ratio of head, in number of setigerous tubercles on head, in size of antenniferous tubercles, the lateral tooth, infraocular and postocular tubercles are to be seen on Figs 9-11. The number of ommatidia grows rapidly (Figs 12-14). Change in relative length of antenna! joints see in Table 1 and Figs 7-8. Surface structures on the tip of antenna! joint IV differ strikingly from those of the remaining parts of the antenna (Figs 15-16), apical structures not much changing from instar III to adult. Wing pads are developing as in other Aradus species (Figs 17-19). The opening of dorsal abdominal scent glands is simple. No special evaporative area was observed, but some subspherical processes anterior to the opening and some transverse wrinkles posterior to it (Figs 20-22). Evaporative area of the metathoracic scent gland opening of the adults shows similar subspherical processes along the ventral part, while in the dorsal part there are dentiform processes (Figs 23-24), For comparison: several Mezira species has in the instars a channel covered with dentiform processes and an evaporative area with flaked cuticule, and the metathoracic scent gland opening is surrounded with flaked cuticule as well.
