You probably need it. Here is an explaination from SUN - ( I know you aren't running Solaris (the route -n command does not give the information you showed)).

Q: What routes are automatically set up?

A: A few routes automatically get set up every time your machine is
booted.

First, all machines will always have a localhost route back to
themselves:

Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ------ ---------
127.0.0.1 127.0.0.1 UH 0 591 lo0

This is standard and increases the efficiency of packets that a
machine sends to itself.

Second, Solaris machines have a special multicast route:

224.0.0.0 150.101.16.28 U 3 0 le0

Multicast routes are used by certain programs that broadcast to a
group of machines rather than to the subnet in general.

Finally, all machines will always set up one route for each of their
interfaces. The route will be a simple one which says that all packets
which go to the interface's network should be routed through the
interface.

For example, I have one interface, le0, with an IP address of
150.101.16.28. Since I use a netmask of 255.255.255.0, this means that
my local network is 150.101.16.0, and the route looks like this:

150.101.16.0 150.101.16.28 U 3 951 le0

(It should be noted that machines which use point-to-point interfaces,
such as PPP, will have slightly different routes consult the PPP Tip
Sheet for more info on these.)