Paloverde Root Borer Derobrachus geminatus Family - Cerambycidae
These guys are huge and as the name implies, are root borers. They are very destructive (I have some dying trees to show for it!). Their larvae eat tree roots.
Canon EOS Rebel XT Digital SLR
Canon Macro Lens EF 100mm 1:2.8
Canon Speedlite 430EX Flash
on a tripod, triggered with Canon RC-1 remote