How cold tolerant are these wasps? I have had a population of similar looking 'wasps', about 4x the size of the ones in this link, which parisitise small flies by landing on their backs sometimes while the fly is in flight. The 'wasps' I have live in the sand under glass where I plunge Tulips Iris Freesias etc. I have had them for about 6 years now. The colony came through minus 18c (0F). Peter (UK) On Mon, Feb 4, 2013 at 2:29 PM, David Pilling <pbs@pilling.demon.co.uk>wrote: > In message <19584294.483169.1359950417207.JavaMail.root@vznit170126>, > arnold140@verizon.net writes > > They come in all sorts of colors. > > Aphids parasitised by wasps change colour. See: > > http://brisbaneinsects.com/brisbane_parawasps/… > > > >