m 48.6 21.5 18.9 12.6 10.0 7.9 5.5
Average 10 ([Female]) 47.5 20.2 17.8 11.8 9.7 7.3 5.1
Minimum 46.2 20.0 17.6 11.5 9.5 7.1 5.0
Maximum 48.3 20.4 18.0 12.0 9.8 7.5 5.5
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Among females from Departamento de Boaco, none of 18 collected on 20
February was pregnant, whereas three of four obtained on 4 April were
gravid (embryos 13, 15, and 17 mm in crown-rump length) as was one
(embryo 21 mm) taken on 18 July. Among those from northwest of
Diriamba, two of three were pregnant on 30-31 March (embryos 7 and 13
mm in length), whereas only three of eight carried embryos (29, 31, and
34 mm) in mid-August at a time when flying young also were collected.
Additionally, a female captured 6 mi WSW Managua on 27 March had an
embryo that measured 11 mm.

Four adult males collected on 20 February had an average testicular
length of 5.7 (4-7) mm, whereas those of seven obtained in late March
averaged 5.0 (4-6) mm; testes of two adults taken on 18 July were 6 and
6.5 mm, and those of three taken in the period 12-15 August were 5 mm
in length.

Molossus sinaloae sinaloae J. A. Allen, 1906

_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