_Specimens._--_Chinandega_: Potosi, 5 m, 2. _Chontales_: Hato
Grande, 13 km S, 8 km W Juigalpa, 60 m, 4. _Rivas_: 4 km S, 1.5 km
E Alta Gracia, 40 m, Isla de Ometepe, 4; Merida, 40 m, Isla de
Ometepe, 2; Finca Amayo, 13 km S, 14 km E Rivas, 40 m, 1.
This fish-eating species, first reported from Nicaragua by Davis _et
al._ (1964:376), apparently occurs throughout Middle America, although
known from the region by comparatively few records. We have 13
additional Nicaraguan specimens as listed above.
The two individuals (both females, one pregnant with an embryo that
measured 20 mm) from Potosi were caught on 6 March in a mist net set
over a large pool in a shallow estuarine stream; the mouth of the
stream opened into the Gulf of Fonseca approximately 200 yards below
our netting site. Other individuals of this species were observed as
they foraged over large pools formed at high tide near the mouth of the
stream. Our other specimens were caught in mist nets set over fresh
water streams near Lake Nicaragua or along the shores of the lake. A
female from near Alta Gracia, caught on 27 March, carried a single
embryo that measured 41 mm, whereas one from Finca Amayo was lactating
on 25 June. Four males taken on Isla de Ometepe in late March and early
April had a mean testicular length of 9.5 (8-10) mm.