364 PEROGNATHUS. 



Color. Exactly like that of P. spinatus. 



Measurements. Total length, average, 188; tail vertebrae, 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. 



J). bryanti (Perognathus) , Merr., Proc. Cal. Acad. Scien., 2d Ser., 



1894, p. 458. 

 BRYANT'S POCKET MOUSE. 



Type locality. San Jose* Island, Lower California, Mexico. 



Geogr. Distr. Type localit^ only. 



Genl. Char. Similar to P. s. peninsula; larger, tail longer. 



Color. Like P. s. peninsula. 



Measurements. Total length, 216; tail vertebras, 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. i, 1889, 



p. 18, pi. n, fig. 13. Elliot, Syn. N. Am. Mamm., 1901, p. 253. 

 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 vertebrae, 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. nelson! (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. 



