Remove old ARS server/admin service

I upgraded from ARS v7.5.0 (old server) to ARS v8.1.3 (new server).

Once everything was completed, I uninstalled ARS from the old server.

When I look at Configuration\Server Configuration\Administration Services, the old server is still listed.  

This is in both my test and production environment. 

In my production environment, I can right click the old server and the context menu offers the option to Delete.

However, in the test environment, there is no Delete option in the context menu.

Can someone point me in the right direction to remove the old server "gracefully"?

Thanks in advance.