Development and Mating Behaviour of Oechalia Schellenbergii (Guérin‐méneville) and Cermatulus Nasalis (Westwood) (Hemiptera: Pentatomidae)1

In laboratory studies the development thresholds of eggs of Oechalia schellenbergii (Guérin‐Méneville) and Crematulus nasalis (Westwood) were found to be above 12.5°C. Survival of eggs of O. schellenbergii was reduced at 15°C compared with temperatures up to 35°C. Egg survival in C. nasalis was significantly less at 15 and 30°C than at 20 or 25°C and nil at 35°C. First‐instar nymphs of both species failed to moult at 15°C indicating a higher development threshold for this stage than for eggs. Survival of nymphs of O. schellenbergii was similar between 20 and 35°C. Survival of nymphs of C. nasalis was similar except at 35°C where it was significantly lower. Reproductive potential of both species was higher between 25 and 30°C with O. schellenbergii better adapted at higher temperatures. Adult longevity of both sexes of both species increased as temperatures decreased. Males of O. schellenbergii displayed an elaborate courtship and mating behaviour which was absent in C. nasalis.