The first specimen on record of this rare _Myotis_ from Central
America, a nonpregnant female, was taken on 11 July 1967 at Santa Rosa,
17 km N and 15 km E Boaco, 300 m, Boaco. It was captured in a mist
net as it foraged over a small stream that supported relatively
well-developed gallery forest along the bank. The surrounding area was
grassland (grazed), with small patches of tropical forest located on
the sides of hills. Twenty other species of bats were taken at this
same locality including _Myotis argentatus_ and _Myotis nigricans
nigricans_.
External and cranial measurements of our specimen, followed in
parentheses by those of the female holotype from Veracruz, are: total
length, 71 (79) mm; length of tail, 32 (34) mm; length of hind foot, 7
(7.5) mm; length of ear, 11 (12) mm; length of forearm, 32.9 (33.0) mm;
greatest length of skull, 12.5 (12.4) mm; condylobasal length, 11.6
(11.9) mm; zygomatic breadth, 8.2 mm; breadth of braincase, 5.8 (6.1)
mm; postorbital breadth, 3.2 (3.2) mm; length of maxillary toothrow,
4.7 (4.6) mm. Our female weighed 3.2 gms.