'Removes one or more instances from the specified instance group,
and delete those instances.
Scopes needed - one of the following:
* https://www.googleapis.com/auth/cloud-platform
* https://www.googleapis.com/auth/compute
:param  node_list: List of nodes to delete.
:type   node_list: ``list`` of :class:`Node` or ``list`` of
:class:`GCENode`
:return:  Return True if successful.
:rtype: ``bool``'

def delete_instances(self, node_list):

    return self.driver.ex_instancegroupmanager_delete_instances(manager=self, node_list=node_list)
