Subterranean termites – in Arizona and most other places in the U.S. they build mud tunnels.
Crickets are notorious at getting into the stucco or crack and crevices and living within that space. They fecal material just falls out of those spaces and we have been getting a lot of calls thinking that they have termites.
Close up view, notice the insect leg.
Just to throw you off, the picture below is Drywood Termites – notice the grooves.
