Studies were conducted to test the effect of age and food sources on wear of the mandibular teeth of the phytophagous pentatomid, Euschistus heros (F.). The total length (µm) of the area bearing the mandibular teeth, the length of the 1st tooth, and the height of the 2nd tooth for teneral (< 1 day-old) adults were significantly greater than that of adults fed on natural [green bean, Phaseolus vulgaris pods, raw shelled peanuts, Arachis hypogaea, and mature soybean, Glycine max seeds] for 30 or 60 days. Adults fed on artificial dry diet showed, in general, similar results to those of teneral adults. Force (Newtons) required penetrating the natural foods was significantly greater than that required penetrating the artificial diet. The greater hardness of the natural foods caused increased mandibular serration wear.

Adults of the tomato stink bug, Arvelius albopunctatus (De Geer), from pasture lands at Londrina, Paraná state (latitude 23º 18' S; longitude 51º 09' W) and of Dichelops furcatus (F.) (Heteroptera: Pentatomidae) from field crops at Cruz Alta, Rio Grande do Sul state (latitude 28º 38' S; longitude) southern Brazil were parasitized by Hexacladia smithii Ashmead , which are set as new host records for this parasitoid.