A Brief Story of Insect Blood
The blood or haemolymph of blister beetles is similar to that of other insects in that it contains nutrients (taken from the food that the beetles eat) that are carried around to the various organs within the beetle's body where they are used to run the internal parts of the bug. The organs also dump their waste products into the blood, which carries them to a special organ that removes these unwanted materials so they can be excreted by the beetle.