Endermite are missing their heads and tails.
When I used a endermite spawn egg to do some test on them they spawned with no heads or tails. I tried to spawn silverfish and they had both their heads and tails so it may just be a skin error or a graphics glitch. Spawning endermites in 1.8 with a windows 8 computer should recreate the problem.
This issue is a duplicate of MC-53461. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.