This biasing force will return the flap portion into contact with the base once an insect has lifted {HEAD ~ the flap} to enter {TAIL ~ the trap} 
This biasing force will return the flap portion into contact with the base once an insect has lifted { HEAD ~ the flap } to enter { TAIL ~ the trap }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL