300 PEROGNATHUS. 



Geogr. Distr. Southern part State of Sonora and northern por- 

 tion State of Sinaloa, plains of the coast, Mexico. 



Genl. Char. Similar to P. per nix, but skull shorter and wider. 



Color. Above broccoli brown; lateral line pinkish buff; under 

 parts whitish; generally paler than P. pernix. 



Measurements. Total length, 162; tail vertebrae, 94; hind foot, 

 23.5. Skull: occipito-nasal length, 22.7; Hensel, 16.5; greatest mas- 

 toid width, 11.7; length of interparietal, 3.4; greatest width of inter- 

 parietal, 7; interorbital constriction, 5.5; length of nasals, 8.6. 



363. helleri (Pcrognathus} , Elliot, Pub. Field Columb. Mus., in, 



1903, p. 166. Zoology. 

 HELLER'S POCKET MOUSE. 



Type locality. San Quentin, Lower California, Mexico. 



Genl. Char. Size similar to P. p. arenarius, color very different, 

 conspicuous lateral line. Skull with shorter nasals, broader ros- 

 trum, wider interorbital space, braincase broader, mastoids less 

 prominent, bullse smaller and more pointed anteriorly. 



Color. Above mixed black and dark buff, giving a dark yellowish 

 brown appearance to the upper parts; distinct bright buff lateral 

 line from nose to rump; under parts pure white; tail above dark 

 brown-, almost dusky, beneath pure white, pencil-like upper part 

 dusky; hands and feet gray; ears dark brown. 



Measurements. Total length, 159; tail vertebra?, 83; hind foot, 

 20.5; ear, 8. Skull: occipito-nasal length, 23; Hensel, 14; zygo- 

 matic breadth, 11.5; interorbital constriction, 6; mastoid breadth, 

 11.5; greatest width of braincase, 10.5; palatal length, 8.5; length 

 of nasals, 7.5; width of rostrum, 4; length of upper tooth row, al- 

 veolar border, 3. 



364. hispidus (Perognaikus) , Baird, N. Am. Mamm., 1857, p. 421. 



Elliot, Syn. N. Am. Mamm., 1901, p. 251. 

 HISPID POCKET MOUSE. 



Type locality. Charco Escondido, State of Tamaulipas, Mexico. 



Geogr. Distr. States of Nuevo Leon and Tamaulipas, Mexico, 

 north into Texas and Oklahoma. 



Genl. Char. Size large; tail about equal to head and body; no 

 spines; antitragus lobed; hind foot broad, short. 



Color. Above brownish black and cinnamon; lateral stripe 

 bright fulvous; under parts, fore legs, and feet white; tail black 

 above, white below; no tuft. 



Measurements. Total length, 208; tail vertebrae, 102; hind foot, 

 24. Skull: length of Hensel, 20.2; occipto-nasal length, 28; greatest 

 mastoid breadth, 13.8; length of interparietal, 4.1; greatest width 



