In the second photo a damselfly dines on a lygus bug while a tiny scuttle fly (at the left) competes for the meal. By the way, I took these photos with the 6x lens of a linen tester mounted in front of a camera not designed for close-up photography.
Your Damselfly foodchain image is great. Sorry we cannot identify the species (possibly a Violet Dancer, Argia vivida). We have real problems identifying dragonflies and damselflies. Perhaps someone will write in and identify it.
Update: Sat, Feb 21, 2009 at 2:48 AM
The shape of the black marking and overall looj makes it a species of the Enallagma (Bluets)genus.