psql bug?

I am running postgres 6.5.3 on an IRIX6.5. In psql, I can't
describe any table I create. I am able to select contents. Is this
a bug?

psql mydb
mydb=> \d
Database = bcams
+------------------+----------------------------------+----------+
| Owner | Relation | Type |
+------------------+----------------------------------+----------+
| dusty | sites | table |
| dusty | sites_pkey | index |
+------------------+----------------------------------+----------+

mydb=> \d sites
ERROR: typeidTypeRelid: Invalid type - oid = 0

mydb=> select * from sites
mydb-> ;
id|site_name | first| second|category_code
----------+----------------+---------+---------+-------------
1111-11111|TRI-CITY AIRPORT|44.111000|18.111000| 1
2222-22222|USED CAR LOT |44.222000|18.222000| 1
3333-33333|BIG CITY MALL |44.333000|18.333000| 2
4444-44444|TOWN DUMP |44.444000|18.444000| 1
5555-55555|VILLAGE PARK NE |44.555000|18.555000| 1
(5 rows)