_=Molossus ater nigricans=_ Miller.--This large free-tailed bat
previously has been reported no farther north in western M['e]xico than
the type locality, Acaponeta, Nayarit. Nineteen specimens from four
different localities in Sinaloa are as follows: 1 mi. SE Camino Re['a]l,
400 ft. (85093-99); 32 mi. SSE Culiac['a]n (61279-87); 1 mi. S Pericos
(61277-78); 1/2 mi. E Piaxtla (61288). The specimens labeled with
reference to Camino Re['a]l and Piaxtla were obtained along the R['i]o
Piaxtla at approximately the same place. Those from 1 mi. S Pericos
extend the known range of the species approximately 225 miles
northwestward.

_M. a. nigricans_ is characteristically an early flier. Along the R['i]o
Piaxtla, 1 mi. SE Camino Re['a]l, where bats probably found daytime
retreats in the rocky walls of the steep-sided valley of the river,
individuals first appeared early in the evening when the sun was still
on the western horizon, but were gone before other species of bats were
seen. A female from 32 mi. SSE Culiac['a]n, taken on June 18, 1954,
contained one embryo that was 18 mm. in crown-rump length. Each of the
color phases of the species, reddish (8) and black (11), are represented
among our specimens. We follow Goodwin (1960) in the use of the specific
name _ater_ for this bat.

_=Dasypus novemcinctus mexicanus=_ Peters.--Two armadillos (85402-03)
from the valley of the R['i]o del Fuerte, 3 mi. NE San Miguel, 300 ft., are
the first of the species to be reported from northern Sinaloa. They
extend the known range northwestward in the state approximately 285
miles from Escuinapa (Russell, 1953:25) and signal the possible
occurrence of _D. n. mexicanus_ in southern Sonora. Sign of the
armadillo was abundant at the place where our two specimens were
collected. Because it was felt that the species possibly had been
introduced along the R['i]o del Fuerte, a number of local residents were
questioned on the point, but all insisted that armadillos were native to
the area.

External measurements of 85402 (female) and 85403 (male) are,
respectively, as follows: total length, 725, 748; length of tail,
351, 357; length of hind foot, 87, 89; length of ear from notch,
39, 39.

_=Sylvilagus audubonii goldmani=_ (Nelson).--This cottontail has been
reported from Sinaloa only from Bacubirito, Culiac['a]n (type locality),
and Sinaloa (Nelson, 1909:226). Additional records are: 12 mi. N
Culiac['a]n (67561-62); 6 mi. N El