black long beetle with yellow design on back and head long legs and antenna
Thank you for sending your question about the insects to eXtension.
Unfortunately, I've no idea at the moment what you may be dealing with. Is there any way you can send a photo of these insects to me at my email address below?
In the meantime, please check out Purdue's bulletin on Insects in Firewood: http://extension.entm.purdue.edu/publications/E-67.pdf .