Monsoon Beetle

Palo Verde Root Borer (Derobrachus hovorei)
From my Little Things of Nature Portfolio -- Sketches Afield.
Know nature. Learn to be still.

It looks scary, but the sight of this beetle is a welcome sight to many of us Arizona natives because it usually means that the summer monsoon and the chance for a thunderstorm or two has finally arrived.  When summer moisture makes its way to the desert, this clumsy flier — usually about 3 to 3.5 inches long — takes wing after spending three or more years in its larval or grub stage to find a mate. 
They are harmless to people and pets in spite of their frightening appearance.