The U.S. Fish and Wildlife Service announces a 6-month extension of the final determination of whether to list the northern long-eared bat (Myotis septentrionalis) as endangered. We also reopen the comment period on the proposed rule to list the species. We are taking this action based on substantial disagreement regarding the sufficiency or accuracy of the available data relevant to our determination regarding the proposed listing, making it necessary to solicit additional information by reopening the comment period for 60 days. Comments previously submitted need not be resubmitted as they are already incorporated into the public record and will be fully considered in the final rule. We will publish a listing determination on or before April 2, 2015.