Michael A. Bogan 1978 A new <i>Myotis</i> is described from the Islas Tres Marias, Nayarit, Mexico. the new species is distinct from related taxa n the adjacent Mexican mainland (<i>M. californicus, M. leibii</i>, and <i>M. carteri</i>), although most closely related to <i>M. carteri</i> as shown by univariate and canonical variates analyses. An analysis of six groups of <i>M. nigricans</i> from Middle and South America supports the elevation of <i>M. nigricans carteri</i> to specific status, confirms the distinctness of <i>M. nigricus extremus</i>, but fails to substantiate subspecific status for bats from Columbia and Ecuador, recent recognized as <i>M. n. punensis</i>. application/pdf 10.2307/1380228 en American Society of Mammalogists A new species of <i>Myotis</i> from the Islas Tres Marias, Nayarit, Mexico, with comments on variation in <i>Myotis nigricans</i> article