{HEAD ~ an electric grid} secured to and substantially surrounding {TAIL ~ said housing}, for destroying insects upon their contacting the grid 
substantially surrounding
{ HEAD ~ an electric grid } secured to and substantially surrounding { TAIL ~ said housing } , for destroying insects upon their contacting the grid
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH