PEROGNATHUS. 353 



Measurements. Total length, 117; tail vertebrae, 71; hind foot, 

 17; ear, 4. Skull: length of Hensel, 14.6; occipito-nasal length, 21; 

 greatest mastoid breadth, 12; length of interparietal, 2.6; greatest 

 width of interparietal, 2.9. 



(i. mexicanus (Perognathns), Merr., Proc. Acad. Nat. Scien. Phil., 



1894, p. 265. 

 MEXICAN POCKET MOUSE. 



Type locality. Tlalpam, Federal District, Mexico. 



Gcogr. Distr. States of Zacatecas and San Luis Potosi to the 

 State of Jalisco on the west and State of Hidalgo on the east, and 

 south to the State of Mexico. 



Genl. Char. Similar to P. flavus, but darker and larger. 



Color. Above buff, mixed with black; spot behind ear, and the 

 lateral line ochraceous; under parts white; tail dusky above, paler 

 beneath. 



Measurements. Total length, 115.7; tail, 53.7; hind foot, 17.4. 



panamintinux hn-r'unisus (Perognathus), Osgood, N. Am. Faun., 

 No. 18, 1900, p. 30. Elliot, Syn. N. Am. Mamm., 1901, p. 246. 

 SHORT-NOSED POCKET MOUSE. 



Type locality. San Bernardino, San Bernardino County, Cali- 

 fornia. 



Geogr. Distr. Lower California north to southern California. 



Genl. Char. Similar to P. patiamintiuus, but darker. Skull 

 smaller; interparietal smaller, nasals shorter; lower premolar larger 

 than last molar. 



Color. Above pinkish buff, lined with black; lateral line pinkish 

 buff; ears dusky, orbital ring buffy; tail buffy white, faintly dusky 

 above. 



Measurements. Total length, 124; tail vertebrae, 66; hind foot, 

 17.4. Skull: length of Hensel, 14.9; occipito-nasal length, 21.4; 

 mastoid breadth, 11.9; length of interparietal, 2.5; greatest width 

 of interparietal, 3.5; interorbital constriction, 5.2; length of nasals, 

 8.3. 



361. pacificus (Perognathus), Mearns, Bull. Am. Mus. Nat. Hist., 



1898, p. 299. Elliot, Syn. N. Am. Mamm., 1901, p. 246. 

 PACIFIC POCKET MOUSE. 



Type locality. Mouth of Tijuana River, Mexican boundary 

 Monument, No. 258, shore of Pacific Ocean, San Diego County, 

 California. 



Geogr. Distr. Edge of Pacific Ocean, on a flat at mouth of 

 Tijuana River, and probably into Lower California, Mexico. 



