I observed this yellow-faced dark blue megarhyssa ichneumon wasp depositing eggs on a red maple tree in western Pennsylvania in August 2008. I found this wasp on the same tree with Megarhyssa megacrurus, as observed by Robert Ganz in downtown Montreal Quebec Canada in June 2005 & posted on BugGuide. Like Mr. Ganz, I observed these wasps depositing eggs on a maple tree. I was able to see the wasp's abdomen and ovipositor pulsing as she drilled and deposited the eggs deep into the wood of a red maple tree. The wasps seemed to preferred bare sections of the trunk with wood exposed- I did not see any laying eggs into the bark. Perhaps a dozen wasps swarmed over this tree while I was watching and protecting them from my young nephew, Drew. I observed these 2 species of wasps at Duman's Dam County Park, Nicktown, Cambria County, in western Pennsylvania on 31 August 2008, during my annual family reunion over Labor Day Weekend. Duman's Dam is located at 40°34'2.65"N Latitude, 78°50'27.10"W Longitude.