_Specimens._--_Boaco_: Santa Rosa, 17 km N, 15 km E Boaco, 300 m,
1. _Managua_: 1 km N Sabana Grande, 1; 3 mi SW Managua, 1; 8 km SW
Managua, 400 m, 3. _Rivas_: San Juan del Sur, 20 m, 1. _Zelaya_: S
side Rio Mico, El Recreo, 25 m, 73.
This mastiff bat can be distinguished easily from the other two large
species of _Molossus_ in Nicaragua in that the hairs of the dorsum
are relatively long and are pale, frequently white, basally. The
species has been reported twice previously from Nicaragua--from
Greytown by Miller (1913a:89) and by Goodwin and Greenhall (1964:13),
who listed four individuals from Rio Grande.
Most of our specimens were taken from buildings. A large series
obtained in a house at El Recreo in late June 1966 consisted only of
females and young, many of which were nearly full grown; some females
still were lactating and at least two were pregnant (on 23
June--crown-rump length of embryos 12 and 14 mm). A group taken from
another house at El Recreo (from cracks in the stone wall and from
between rafters and the corrugated metal roof) in late July 1966
consisted of adult males, lactating females, and young. Similarly, an
adult male, a pregnant female (embryo 14 mm in crown-rump length), and
a hairless juvenile were shot, on 16 February 1964, from a small colony
in an attic of a large house southwest of Managua; _Glossophaga
soricina_ also was taken in this attic. The testes of an adult male
captured in June were 6 mm in length; those of four taken in July were
5, 5, 6, and 7 mm, and one obtained in August had testes that measured
3 mm.
Selected measurements of _M. s. sinaloae_ from El Recreo are given
in Table 4.