Delete a branch/head

[Kyle Butt]

Is it possible to delete a head instead of merging it back to the tip?
For example:

kyle at North:~/tmp>cd hg-temp
kyle at North:~/tmp/hg-temp>hg init
kyle at North:~/tmp/hg-temp>echo a > a
kyle at North:~/tmp/hg-temp>hg add
adding a
kyle at North:~/tmp/hg-temp>hg ci -m "add a"
kyle at North:~/tmp/hg-temp>echo "b1" > b
kyle at North:~/tmp/hg-temp>hg add
adding b
kyle at North:~/tmp/hg-temp>hg ci -m "add b branch 1"
kyle at North:~/tmp/hg-temp>hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
kyle at North:~/tmp/hg-temp>echo "b2" > b
kyle at North:~/tmp/hg-temp>hg add
adding b
kyle at North:~/tmp/hg-temp>hg ci -m "add b branch 2"
kyle at North:~/tmp/hg-temp>hg heads
changeset:   2:1350f1eaf45a
tag:         tip
parent:      0:bbfa8fa1dc03
user:        "Kyle Butt <kylebutt at gmail.com>"
date:        Sat Sep 09 10:43:33 2006 -0600
summary:     add b branch 2

changeset:   1:b08915b6ecdf
user:        "Kyle Butt <kylebutt at gmail.com>"
date:        Sat Sep 09 10:42:54 2006 -0600
summary:     add b branch 1

kyle at North:~/tmp/hg-temp>

Now I'd like to be able to delete one branch so that only the other
remains. Either branch, so hg rollback isn't really an option.

Thanks,

Kyle