Differences from _M. californicus_ include shorter tail, more golden color on underparts, deeper notch in tragus, shorter skull, notched instead of smooth posterior border of P4 (in occlusal view), longitudinal, dorsal profile of skull less abruptly elevated in frontal region and with (instead of without) prelambdoidal depression. From _M. c. mexicanus_ that occurs to the north, west, and south of the type locality of _M. elegans_ the latter further differs in darker color, paler ears, paler flight membranes, and lesser size, including skull. Differences from _M. nigricans_ of the same region include reddish instead of black pelage, smaller hind foot, smaller skull, rostrum smaller in relation to remainder of skull, narrower interorbital region, and absence of a sagittal crest. _Measurements._--Total length, 79; length of tail, 34; length of hind foot, 7.5; length of ear from notch, 12; length of tragus, 6.5; weight, 4 grams; length of forearm, 33.0; greatest length of skull, 12.4; condylobasal length, 11.9; interorbital constriction, 3.2; breadth of braincase, 6.1; occipital depth, 4.5; length of mandible, 8.9; length of maxillary tooth-row, 4.6; maxillary breadth at M3, 4.9; length of mandibular tooth-row, 5.0. Degree of wear on teeth, stage 2 (in terminology of Miller and Allen, Bull. U. S. Nat. Mus., 144, May 25, 1928). _Remarks._--The longitudinal dorsal profile of the skull and the deeply notched posterior border of P4 seem to be distinctive of _elegans_. When the characters of _elegans_ first were tabulated it was felt that it probably was only subspecifically different from some previously named species. But further study of the distinctive characters indicates that they are outside the range of variation of any near relative of _elegans_ and it, therefore, is here accorded specific rank. [Illustration: FIG. 1. Lateral view (left) and dorsal view (right) of the holotype of _Myotis elegans_, x 2.] _Material examined._--Known only from the holotype. _Transmitted April 2, 1962._ 29-3265 End of Project Gutenberg's A New Bat (Myotis) From Mexico, by E. Raymond Hall