1918] Grinnell: A Synopsis of the Bats of California 353 
Antrozous pallidus pacificus, Elliot (1907, p. 518). Record of specimens 
taken at Fort Tejon and San Rafael. 
Antrozous pallidus pacificus, Lyon and Osgood (1909, pp. 278-279). Loca- 
tion and condition of type. 
Antrozous pallidus pacificus, Miller (1912, p. 68). General range. 
Antrozous pallidus pacificus, J. Grinnell (1913b, p. 282). Range in Cali- 
fornia. 
Diagnosis —Forearm 53.7 to 58.9 millimeters; greatest length of 
skull, 22.0 to 23.9; color, yellowish drab brown. 
Description—In general characters Antrozows pacificus is very 
similar to Antrozous pallidus, but is slightly larger, with decidedly 
larger skull (pl. 23, fig. 53, and pl. 24, fig. 61), and darker coloration. 
Limbs, membranes, and pelage essentially similar to those of pallidus. 
Color—On the upper surface the hairs are pale yellowish drab 
at their bases, sepia or drab on distal third. The light bases of the 
hairs show in irregular patches. According to Stephens (1906. 
p. 263) there is a patch on the back of the neck, and sometimes one 
on the rump, where the dark tips are lacking. This is difficult to 
determine in some of the dried skins. On the under surface the hairs 
are cream color, shghtly darker at the tips. 
Skull—tThe skull varies in greatest length from 22 to 23.9 milli- 
meters. The brain-case, rostrum and bony palate are considerably 
broader than in pallidus. The length of the bony palate behind the 
molars (exclusive of the median spine) is usually equal to or greater 
than width at base of median spine. 
Teeth—tThe teeth are larger than those of pallidus, but similar 
in form, save that the upper premolar is conspicuously broader and 
shorter. 
Measurements.—Average and extreme measurements of a series 
of seventeen specimens in the Museum of Vertebrate Zoology are as 
follows: ten males: total length, 118.0 (extremes, 109.0-125.0) ; 
tail vertebrae, 44.5 (39.0-49.0) ; tibia, 19.9 (19.0-22.0); foot, 13.1 
(11.0-16.0) ; forearm, 55.0 (54.0-56.0) ; greatest length of skull, 22.4 
(22.0-23.0) ; seven females: total length, 118.8 (114.0-122.0) ; tail 
vertebrae, 43.4 (41.0-46.0) ; tibia, 19.9 (18.0-21.7) ; foot, 13.4 (18.0- 
16.0); forearm, 55.3 (53.5-58.9) ; greatest length of cranium, 22.6 
(22.0-23.9). 
Synonymy and History.—H. Allen (1864, p. 68) remarked that 
in the species (Antrozous pallidus) two varieties of color are observed, 
but he does not attempt to separate the possible forms indicated. 
Many years later, C. H. Merriam (1897, pp. 179-180) described the 
darker race under the name pacificus, selecting his type from three 
specimens secured at Old Fort Tejon, California. The uniformly 
much larger skull of pacificus, together with lack of imtergradation 
with pallidus, causes the present writer to consider pacificus a distinct 
species, rather than a race of pallidus. 
Distribution —The general range of A. pacificus is given by Miller 
(1912, p. 68) as ‘‘Austral zones of the western United States and 
