• Collins, Judith A.
  University of Maine
  
• Jennings, Daniel T.
  University of Maine
  

Three species of eumenid wasps, Ancistrocerus adiabatus, ancistrocerus antilope, and euodymerus leucomelas, accepted and provisioned predrilled wooden blocks placed in a spruce-fir forest of Maine. The eumenids preyed on late instars of the spruce budworm, choristoneura fumiferana (clemens) and on other lepidopterous defoliators. Spruce budworm accoutered for 94% of provisioned prey. There was no significant difference in acceptance among trap-nesting blocks at four heighs ( 0.0, 0.50, 1.0, and 1.5 m) However, there was a trend toward increased acceptance of blocks at .5m.