Metal legends Motorhead announced Wednesday they have canceled their scheduled performances in Dallas and Houston, slated fro September 4th and 5th, respectively.  As has been the case at a number of recent Motorhead shows, the reason for the latest cancellations is the continued heath concerns of frontman Lemmy Kilmister.  The band was also forced to cancel a September 2nd show in San Antonio, and the band managed just three songs at an Austin show before Lemmy was forced to end the gig early.  The band is scheduled to be off through Labor Day, then resume the tour Tuesday, September 8th in St. Louis.