Circular Holes in the Leaves Starting Early Summer

Q. I have begun to notice crescent shaped chunks being
taken from my roses…probably at night since I do not see them during the day.In
the Caribbean I notice a similar pattern on certain flowering plants which
turned out to be leaf eating ants that could be traced back to their nests by
following the parade of marching flower petals.We spray for ants and scorpions
monthly and I have not seen any ants.From this I conclude it is a flying
insect.Is there such a creature as a leaf eating BEE here in the Las Vegas
Valley?If so, what should I do to prevent continued defoliation?I appreciate
your advice; you have never steered me wrong.

Leafcutter or Leaf Cutter bee damage to leaves