I will pop one out and get a better photo tonight.... I believe they are round...yes the walnut was cut down 1-2 years ago.... the reason I asked is because these are in the hickory I got this year too (don't know if they are same bug or not)... and it hasn't been cut down for over 3-6 months...I think they are the same but I will check in a piece of hickory, ash, and walnut tonight....
In my hickory pile you can see little piles of saw dust that these little bastards leave behind...
Thanks for the quick reply guys!!!!