MURID.E 107 



browner; body stout; tail distinctly bicolor; ears and hind feet 

 long. 



Length about 195 mm. (7.70 inches) ; tail vertebrae 105 

 (4.15) ; hind foot 23 (.90) ; ear from crown 23 (.90). 



Type locality, Fort Wingate, New Mexico. 



Big-eared Mice, including the subspecies, are widely dis- 

 tributed over the southwestern United States. In California they 

 are found principally in the foothills and mountains of the coast 

 region. They seem to be local in distribution and are probably 

 most plentiful in the west central part of the State. Probably 

 the Californiam form will ultimately be known as subspecies 

 gilberti. I have nO' material from the type locality and cannot 

 be sure therefore that such is the real status of the Californian 

 form. 



I have most frequently found the Big-eared Mice in thickets 

 of brush in open forest. The litters of young are small, usually 

 but two or three in number. 



Subgenus Haplomylomys Osgood. (Simple — molar — 



mouse. ) 



Skull with cranium relatively large; first and second upper 



molars with but twO' reentrant angles on the outer side, the small 



secondary tubercles being absent; lower molars correspondingly 



simple; tail longer than head and body, thinly haired. 



Peromyscus calif ornicus Gambkl. (Of California.), 



CALIFORNIA MOUSE. 



Size very large; ears very large; tail long, short haired, 

 distinctly bicolor in adults ; soles naked ; above yellowish brown 

 thickly mixed with black, especially on the back and hips which 

 are often nearly black; sides tinged with ochraceous passing to 

 ochraceous buff on the lower part of the sides and there strongly 

 contrasting with the grayish white lower parts; breast more or 

 less tinged with ochraceous. often forming a spot; feet white; 



