cut for whole lines

[Craig White]

I am trying to script reading the table info from postgres into a file.

I need to get rid of the first 2 and last 2 lines and it should be easy
but obviously cut is for grabbing bits of lines where I need to remove
the whole line.

# cat my_tables.txt
       tablename
-----------------------
 engine_schema_info
 plugin_schema_info
...snipped here...
 services
(43 rows)

I need to lose the top 2 lines:
      tablename
---------------

and the bottom two lines
(43 rows)
and a blank line (though this would probably be OK)

how do I accomplish via bash or coreutils (like cut)?

Thanks

Craig