nes 
PEROGNATHUS. 367 
Geogr. Distr. Known only from type locality. 
Genl. Char. Similar to P. fallax, but smaller, and comparative 
differences in skull. 
Color. Upper parts grayish fawn, mixed with black; lateral line 
faint, brownish fawn; white spots under eye; tail above dusky, 
beneath whitish. 
Measurements. Total length, 168; tail vertebrae, g2; hind foot, 
23.5. Skull: occipito-nasal length, 25.4; Hensel, 17.4; greatest mas- 
toid breadth, 12.9; length of interparietal, 2.6; greatest width of 
interparietal, 5.8; interorbital constriction, 6; length of nasals, 10.2. 
374. femoralis (Perognathus), Allen, Bull. Am. Mus. Nat. Hist., 
1891, p. 281. Elliot, Syn. N. Am. Mamm., rgor, p. 254. 
GREAT CALIFORNIA Pocket MOUSE. 
Type locality. Dulzura, San Diego County, California. 
Geogr. Distr. Northern Lower California, Mexico, and adjoining 
portions of southern California. 
Genl. Char. Tail much longer than head and body; size large. 
Color. Above grayish yellowish brown, lined with black; lateral 
line fulvous; fore legs, feet, and under parts white; tail above sooty 
brown, including tip, beneath white. 
Measurements. Total length, 198-241; tail vertebrae, 112-133; 
hind foot, 25-27. Skull: occipito-nasal length, 29.6; Hensel, 20.3; 
greatest mastoid breadth, 14.3; length of interparietal, 4; greatest 
width of interparietal, 8.1; length of nasals, 11.4; interorbital con- 
striction, 7.1. 
a.—mesopolius (Perognathus), Elliot, Pub. Field Columb. Mus., 111, 
1903, p. 168. Zodlogy. 
Gray Pocket Mouse. 
Type locality. Pinon, San Pedro Martir Mountains, Lower Cali- 
fornia, Mexico; 5,000 feet elevation. 
Genl. Char. Size large; ear large; hind foot and tail long; similar 
in color to P. jemoralis, but grayer and without the bistre hue. 
Skull with greater interorbital constriction and less mastoid breadth. 
Color. Above mixed pale gray and light buff, lined sparingly 
with black; sides grayer than upper parts; lateral line bright buff; 
under parts, hands, and feet pure white; tail and pencil dusky 
above, white beneath; ears light brown. 
Measurements. Total length, 232; tail vertebre, 136; hind foot, 
27; ear, 14. Skull: occipito-nasal length, 27; Hensel, 18; zygomatic 
width, 13; mastoid breadth, 13; interorbital constriction, 6; palatal 
length, 10; length of nasals, 10; posterior width of nasals 2; anterior 
width of nasals, 3; greatest width of rostrum, 5. 
