Frank writes “011 shows just how abundant these foreign larvae were in some cases. In this image, they are actually spilling out of the channels because the upper part of the channel was filled too. Notice also that at the right-hand side of the image there is a chamber filled with wiry frass that is different from the stuff in image 004.”
These grubs, may well be the ‘fruit fly’ Joe S. took and I wrote about on Jan 7th 2011 in this blog. Joe mentioned these fruit flies had red eyes. A friend of Joe’s searched the web and came up with “houdini fly” Cacoxenup-inbagator flies.
If you still have these grubs, set them up in a moist warm environment such as a petri dish and see what comes out. What an interesting project for a child who is interested in science. The search continues.