# File lib/ec2/right_ec2_instances.rb, line 87
    def describe_instances(*instances)
      instances = instances.flatten
      link = generate_request("DescribeInstances", amazonize_list('InstanceId', instances))
      request_cache_or_info(:describe_instances, link,  QEc2DescribeInstancesParser, @@bench, instances.blank?) do |parser|
        get_desc_instances(parser.result)
      end
    rescue Exception
      on_exception
    end