region elevated from posterior part of parietal region; posterior
margin of P4 (in occlusal view) notched.

_Comparisons._--Among named kinds of _Myotis_, _M. elegans_ shows
most resemblance to the species _M. californicus_ and _M.
subulatus_. Differences from the latter include shorter tail and
ear, more golden color on underparts, pale (not blackish) lips,
ears and flight membranes, more slender tragus, shorter skull,
posterior border of P4 (in occlusal view) more deeply notched, and
longitudinal dorsal profile of skull higher in frontal and
lambdoidal regions.

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 ra