Stingless Bee, Tetragonula carbonaria, also known as the Sugarbag Bee
Last Updated: 20 June 2013
Thanks for your observations on Trigona - despite being stingless they are far from helpless when it comes to defending their hive, especially from other invertebrates (although my hive always has a few of the parasitic hoverflies buzzing around it at this time of year). Most bees are capable of producing secretions from mandibular glands, and the secretions from Trigona can be mixed with resin to produce a noxious glue-like substance. It is very effective at stopping small hive beetle. I assume that it must be the mandibular secretions that have caused your reactions.
1 William Street
NSW 2010 Australia