364 PEROGNATHUS. 
Color. Exactly like that of P. spinatus. 
Measurements. Total length, average, 188; tail vertebre, 101; 
hind foot, 24. Skull: occipito-nasal length, 26.5; Hensel, 18; 
greatest mastoid breadth, 13; length of interparietal, 3.7; greatest 
width of interparietal, 7.6; least interorbital width, 6.6; length of 
nasals, 9.8. 
b.—bryanti (Perognathus), Merr., Proc. Cal. Acad. Scien., 2d Ser., 
1894, p. 458. 
Bryant’s Pocket Mouse. 
Type locality. San José Island, Lower California, Mexico. 
Geogr. Distr. Type locality only. 
Genl. Char. Similar to P. s. peninsule; larger, tail longer. 
Color. Like P. s. peninsule. 
Measurements. Total length, 216; tail vertebre, 127; hind foot, 
25. skull: occipito-nasal length, 27.3; Hensel, 18.9; greatest mas- 
toid breadth, 13.1; length of interparietal, 3.5; greatest width of 
interparietal, 8.1; interorbital constriction, 6.8; length of nasals, 10.3. 
369. intermedius (Perognathus), Merr., N. Am. Faun., No. 1, 1889, 
p. 18, pl. rz, fig. 13. Elliot, Syn. N. Am. Mamm_ 1966"pmeqae 
INTERMEDIATE Pocket MOUSE. 
Type locality. Mud Spring, Mohave County, Arizona. 
Geogr. Distr. State of Chihuahua, Mexico, into Texas and Arizona. 
Genl. Char. Tail much longer than head and body; antitragal 
lobe large; soles naked. 
Color. Above drab gray, tinged with pale fulvous and lined with 
black; lateral line pale fulvous; fore legs, feet, and under parts white; 
tail above sooty brown, beneath whitish. 
Measurements. Total length, 183; tail vertebre, 106; pencil, 18; 
hind foot, 21; ear, 4.5. Skull: occipito-nasal length, 24.5; Hensel, 
17; greatest mastoid breadth, 13.5; length of interparietal, 3; 
greatest width of interparietal, 8; interorbital constriction, 6-3; 
length of nasals, 9.4. 
370. nelsoni (Perognathus), Merr., Proc. Acad. Nat. Scien. Phil., 
1894, p. 266. 
NELSON’s Pocket Mouse. 
Type locality. Hacienda La Parada, 25 miles northwest of the 
city of San Luis Potosi, State of San Luis Potosi, Mexico. 
Geogr. Distr. States of San Luis Potosi and Durango, south into 
State of Jalisco, and east into State of Tamaulipas, Mexico. 
Genl. Char. Similar to P. intermedius, but larger and darker; 
bristles on rump; tail crested. 
