Tox doesn't support 2.4, even though it understands py24.

nedbat · nedbat · commit d025aa7ab8cf · 2012-09-08T09:20:29.000-04:00
diff --git a/tox.ini b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py24, py25, py26, py27, py31, py32, py33, pypy
+envlist = py25, py26, py27, py31, py32, py33, pypy
 
 [testenv]
 setenv = 
