Urocerus gigas
Urocerus gigas (giant woodwasp, banded horntail, greater horntail) is a species of sawfly native to the Palearctic realm and North Africa. Adults are usually between in length. Subspecies: "U. gigas" is a wood-boring insect that attacks softwoods of freshly felled logs/unhealthy trees. The species lives in discrete tunnels, frequently filled with hard-packed coarse fibrous frass, hard to dig out from tunnels. The tunnels are large, round and discrete, between in diameter. "Urocerus flavicornis" was once considered a subspecies of "gigas" but is now known to be a separate species .