Reproductive behavior of the stink bug Thyanta pallidovirens (Stål) was studied in the laboratory, including the determination of the sexual maturation period for both sexes, the effects of the number of copulations on fecundity, and the function of prolonged copulation. Mean premating periods for males and females were 3.6 ± 0.5 and 4.1 ± 0.6 d, respectively. Preoviposition period averaged 6.6 ± 0.9 d. Females preferred sheltered, roughtextured oviposition sites. Paired adults mated ≈13 times on average during their lifespan under laboratory conditions. The mean duration of copulations involving virgin females was >17 h, significantly longer than that of subsequent copulations, which lasted between 6.9 and 8.3 h. Multiple matings significantly increased female fecundity. Virgin males donated ≈17% of their body mass to a virgin female during mating. Duration of mating may be regulated by space available in the spermatheca for ejaculatory material. There was strong evidence of male mate choice, with males terminating copulation with small females before sperm was transferred. There was no indication of male mate-guarding behavior after copulation. Females almost always approached males from distances of >30 cm, suggesting that males attract females from a distance. Within 15 cm, males discern and approach females. Courtship behaviors of males included antennation of female antennae and abdomens, stroking the abdomens with the hind legs, and periodic male abdominal vibrations. Possible functions of these behaviors are discussed.

The Australian longicom beetle genus Phoracantha Newman is revised and the scope of the genus is redefined. Tryphocaria Pascoe is synonyrnised with Phoracantha. The revised Phoracantha includes 40 species, 9 of which are described as new: P. niamata, P. manifesta, P. ancoralis, P. multiformis, P. complicata, P. tuberalis, P. cruciata, P. perbella and P. rugithoracica. Diagnosis and brief descriptions of other species are provided. New synonyms are listed as follows (senior synonyms last): Tryphocaria with Phoracantha, Xypeta Pascoe with Phoracantha, T. gisleni Tippmann with P. northamensis (McKeown), P. recurva papua Gressitt with P. recurva Newman, P. hospita Pascoe with P. semipunctata (Fabricius), P. posticalis Blackburn with P. obscura (Donovan). Distributional maps are given for all species except P. princeps (Blackburn). Male terminalia are described and figured, and ovipositors are figured only. A key to the 40 species is given. Brief comments are given on the biology of this beetle group.