This image shows a sub-fossilized insect in copal. (Credit: Dr. David Penney, University of Manchester)
I’m sure that there is going to be an absence of DNA in a LOT of the insects.
For it to be perfect the blood would have to have been drawn minutes before they were fossilized. Otherwise the DNA would be broken down and digested.
"Bawk bawk bawk!"
What about from actual dinosaur cell tissues?
http://www.smithsonianmag.com/science-nature/dinosaur.html
Why waste time with insects?